Polyimide Polymer Research Articles

Role of filler and its heterostructure on moisture sorption mechanisms in polyimide films

Moisture sorption and diffusion exacerbate hygrothermal aging and can significantly alter the chemical and mechanical properties of polymeric-based components over time. In this study, we employ a multi-pronged multi-scale approach to model and understand moisture diffusion and sorption processes in polyimide polymers. A reactive transport model with triple-mode sorption (i.e., Henry’s, Langmuir, and pooling), experiments, and first principles atomistic computations were combined to synergistically explore representative systems of Kapton H and Kapton HN polymers. We find that the CaHPO4 processing aid used in Kapton HN increases the total moisture uptake (~0.5 wt%) relative to Kapton H. Henry’s mode is found to play a major role in moisture uptake for both materials, accounting for >90% contribution to total uptake.However, the pooling mode uptake in Kapton HN was ~5 times higher than in Kapton H. First principles thermodynamics calculations based on density functional theory predict that water molecules chemisorb (with binding energy ~17–25 kcal/mol) on CaHPO4 crystal surfaces. We identify significant anisotropy in surface binding affinity, suggesting a possible route to tune and mitigate moisture uptake in Kapton-based systems through controlled crystal growth favoring exposure of CaHPO4 (101) surfaces during manufacturing.

Effect of Surface Treatment on Flexural and Tribological Properties of Poly(p-phenylene Benzobisoxazole)/Polyimide Composites under Normal and Elevated Temperature.

(1) In order to improve the interface bonding state between poly(p-phenylene benzobisoxazole) (PBO) fibers and a polyimide (PI) polymer matrix, as well as its effectiveness under elevated temperature, rare earth solution (RES) and coupling agent were employed toward PBO fibers as surface modifiers in this article, respectively. (2) The surface characteristics of the PBO fibers before and after modifications were characterized and analyzed by X-ray photoelectron spectroscopy (XPS) and Fourier transform infrared spectroscopy (FT-IR). The effects of the surface treatment of the PBO fibers on the flexural properties and friction and wear behaviors of the polyimide polymer matrix composites reinforced by PBO fibers (PBO/PI) were studied under normal and elevated temperature, and the morphologies of the bending fracture and the worn surface were observed through scanning electronic microscopy (SEM). (3) The results revealed that the RES modification was superior to the coupling agent modification regarding increasing the surface activity of the PBO fibers. (4) The PBO/PI composite treated by RES had higher flexural properties and more excellent anti-friction and wear resistance than the pretreated and coupling agent-treated composites under both normal and elevated temperatures.

Long-term recording reliability of liquid crystal polymer µECoG arrays

Objective. The clinical use of microsignals recorded over broad cortical regions is largely limited by the chronic reliability of the implanted interfaces. Approach. We evaluated the chronic reliability of novel 61-channel micro-electrocorticographic (µECoG) arrays in rats chronically implanted for over one year and using accelerated aging. Devices were encapsulated with polyimide (PI) or liquid crystal polymer (LCP), and fabricated using commercial manufacturing processes. In vitro failure modes and predicted lifetimes were determined from accelerated soak testing. Successful designs were implanted epidurally over the rodent auditory cortex. Trends in baseline signal level, evoked responses and decoding performance were reported for over one year of implantation. Main results. Devices fabricated with LCP consistently had longer in vitro lifetimes than PI encapsulation. Our accelerated aging results predicted device integrity beyond 3.4 years. Five implanted arrays showed stable performance over the entire implantation period (247–435 d). Our regression analysis showed that impedance predicted signal quality and information content only in the first 31 d of recordings and had little predictive value in the chronic phase (>31 d). In the chronic phase, site impedances slightly decreased yet decoding performance became statistically uncorrelated with impedance. We also employed an improved statistical model of spatial variation to measure sensitivity to locally varying fields, which is typically concealed in standard signal power calculations. Significance. These findings show that µECoG arrays can reliably perform in chronic applications in vivo for over one year, which facilitates the development of a high-density, clinically viable interface.

Estimation of interphase properties of various mixed matrix membranes

ABSTRACTA generalized course of action was proposed for determining the separation properties of the interphase between filler and polymer phases in various mixed matrix membranes (MMMs). Accordingly, the permeability and thickness of the interphase were estimated by using the modified form of effective medium theory (EMT) and CO2, N2 and CH4 permeability data at two different filler loadings obtained from the literature. In spite of the sensitivity of the estimations to experimental inconsistencies in the data used, significant information could generally be obtained about the interphase permeability and thickness. It was observed that the interphase in different types of MMMs could have dissimilar separation properties even when the polymer used was the same. The CO2/CH4 ideal selectivities of the interphase between graphene oxide and polyether block amide (Pebax) polymer and the interphase between zeolite Y and a polyimide polymer, Matrimid, were determined to be higher than the selectivities of the pure polymers. Tailoring the interphase by having good knowledge of its properties, is expected to provide significant means for further improvement of the performances of mixed matrix membranes.

Enhancing the mechanical strength and CO2/CH4 separation performance of polymeric membranes by incorporating amine-appended porous polymers

The incorporation of solid fillers into mixed matrix membranes (MMMs) is a promising approach to overcome the permeability-selectivity trade-off characteristic of polymeric membranes. However, MMMs that contain conventional fillers (e.g., zeolites, silicas, and porous carbons) usually exhibit defects due to incompatible interfaces between fillers and glassy polymers. High porosity and good robustness are also desirable properties of filler materials that enhance the gas separation performance of resulting MMMs. Herein, amine-functionalized organic porous polymers (PP-DETA and PP-menm) were synthesized and used as filler materials to yield mechanically stable MMMs that possess good CO2/CH4 separation performance. We found that in comparison with the MMMs loaded with bare porous polymers (PP), composite membranes that contain amine-functionalized fillers exhibited both superior mechanical strength and more effective adhesion to glassy Matrimid® Polyimide (PI) and polysulfone (PSf) polymers. In particular, the tensile strength of 10 wt%_PP-menm@PI was measured to be 69 MPa, which was higher than 26 MPa and 33 MPa for 10 wt%_PP@PI and pure PI membrane, respectively. More importantly, both the CO2 permeability and CO2/CH4 selectivity of MMMs improved significantly after the introduction of amine-functionalized fillers. These results imply that organic porous polymers, particularly those that contain amine-functional groups, are outstanding filler materials for the fabrication of defect-free MMMs with enhanced gas separation performance.

Solderable Polymer Thick-film Conductors for Low Temperature Substrates

Abstract For decades, polymer thick-film (PTF) systems have provided a low cost, non-fired option for screen-printing simple electronic circuits. The ability to apply these types of pastes on temperature sensitive substrates such as PET, polycarbonate, polyimide, and other polymers has facilitated a variety of applications, for instance membrane touch-switch keypads, buss bars for touch screens, various types of sensors, and flexible circuitry. Polymer thick-film is also one of the primary technology solutions utilized in the rapidly emerging Printed Electronic market, where flexible, durable materials are paramount to the success of these technologies. One of the largest emerging markets for polymer thick-film is wearable electronics, where engineers are designing “smart fabrics” with active circuitry for medical monitoring, performance enhancement in sports, and personal comfort. Polymer thick-film pastes include silver pastes for conductors, carbon pastes for resistive applications, silver-silver chloride fillers for glucose sensors, and dielectric pastes. The major challenge with PTF silver conductors is that they are not conducive to soldering. This hinders the ability to attach components, leads, dies, wires, or other features to the prints. As copper is solderable, one possible solution would be a copper polymer thick-film metallization; however they start oxidizing at the typical paste curing temperatures, 110 – 130°C, rendering them unsuitable for the vast majority of conductive applications. In order to meet these challenges, Heraeus has developed a new line of solderable polymer thick-film conductors based on a high-performance silver-coated copper conductive filler. These metallizations are solderable, resistant to solder leaching, and result in sheet resistivities approaching that of pure silver polymer conductors. The prints do not degrade in performance when cured at temperatures as high as 200°C. The new product line was formulated to accept different types of solders, especially traditional SAC-305, which provides a complete matched solution for designers. The new metallization opens up new applications given its ability to print polymer circuitry on a variety of substrates including aluminum, steel, FR4, Kapton, Mylar, and glass. The technology also allows for the fabrication of more complex circuitry on these types of substrates, giving circuit designers a powerful new tool in their toolbox in applications such as LED lighting, sensors, and heaters. Finally, these materials may provide a lower-cost option for solderable flexible polymer end terminations for components used in vibration sensitive applications, for instance the automotive industry. In our paper, we will present the properties of the new pastes and printed conductors. Performance testing includes surface resistivity, solderability, solder leach resistance, voiding, and adhesion on two substrates: FR4 and Kapton. Furthermore, we show that the solderable PTF conductor will provide a potential cost- savings over the current technology used on FR4 boards, stamped copper films. By replacing the stamped copper with our solderable PTF conductor, manufacturers will have the advantage of replacing a subtractive process for etching their patterns with an additive, environmentally friendly process, not only saving processing time but eliminating a large, dangerous copper waste stream. Finally, we will summarize the applications that the new technology enables.

Electronic energy transfer effects of Ti9+ and S9+ ions irradiations upon structural, optical and chemical properties of Kapton-H polymer

The exposure of polymeric materials to high energy ions increases their applicability in numerous fields by altering certain properties. The electronic energy loss (Se) of swift heavy ions (SHI) is the most responsible parameter for the change of properties of a material under exposure. The value of Se increases as the atomic number (Z) of the impinging ions upon the target sample is increased. The current research enlightens the structural, optical and chemical modifications in Kapton-H polyimide polymer due to S9+ (Z = 16) and Ti9+ (Z = 22) ions (each of energy 120 MeV) irradiations in the fluence range of 5 × 1010 to 5 × 1012 ions/cm2. In the results, the polymer amorphization was observed in the X-ray diffraction (XRD) studies whereas UV visible (UV–Vis) spectroscopy showed shift in the absorption peak thereby decreasing the band gap energy up to 12.4% as per Tauc's relation calculations. In addition to these results, certain modifications in prominent bands such as C= O carbonyl symmetric stretching and OH stretching were observed in Fourier transform infrared (FTIR) spectroscopy. The crystallite size was observed to be modified in XRD study. The photoluminescence studies revealed that the intensity peaks of irradiated samples decreased at lower fluences, however the opposite behaviour was observed at higher fluences in both cases of irradiations.

High solvent-resistant and integrally crosslinked polyimide-based composite membranes for organic solvent nanofiltration

This paper reports a new class of integral polyimide (PI)-based thin film composite (TFC) membranes (with improved solvent resistance in both the skin layer and the substrate) for organic solvent nanofiltration (OSN). The OSN membrane was prepared via interfacial polymerization (IP) onto a PI ultrafiltration (UF) substrate, followed by an imidization, a chemical crosslinking, and a solvent activation process. During the IP process, m-phenylenediamine (MPD), dopamine (DA), and 1,2,4,5-benzene tetracarboxylic acyl chloride (BTAC) were respectively used as an aqueous monomer, an aqueous additive, and an organic monomer. We proved that amide bonding formed between MPD and the PI substrate during the immersion of the substrate in the aqueous MPD solution, thus providing a strong binding between the substrate and the subsequently formed skin layer of polyamide acid (PAA), which was formed due to reaction between MPD and BTAC during the IP process. DA contains amine group and could also help build a strong binding between the substrate and the skin layer during the same IP process. The subsequent imidization step converted the PAA molecules of the skin layer into PI polymers, which was quite similar to that of the substrate. The final crosslinking step crosslinked not only the inner molecules of the skin layer, and the inner molecules of the substrate, but also the interface molecules between the skin and substrate so as to form an integral composite membrane with improving solvent resistance. The fabricated OSN membranes under optimal preparation conditions exhibited an ethanol permeance of 2.03 L m−2 h−1 bar−1 with a rejection of 98% for Rhodamine B (479 Da) and exhibited an outstanding organic solvent resistance without compromising separation performance during the persistent immersion in DMF at 80 °C for two weeks, indicating a promising prospective in OSN applications.

Non-cross-linked, high molecular weight, polyimide polymer

Non-cross-linked, high molecular weight, polyimide polymer

Self-assembled MXene-based nanocomposites via layer-by-layer strategy for elevated adsorption capacities

The chemical modification and organized self-assembly of MXene-based nanocomposites demonstrate critical importance to a wide range of material applications. Herein, we have investigated the preparation of new hierarchical core-shell type MXene-based composite materials for high-efficient dye removal in wastewater treatment via layer-by-layer (LbL) strategy. From the carboxyl functionalization of the MXene material, the negative functional groups were obtained on the surface of the shell composite layer. Carboxyl functionalized MXene materials are immersed in polyimide and polyacrylic acid solution respectively, which leads to formation of shell structure on the surface of MXene layer. Alternating self-assembly processes in the solutions of the polyimide and polyacrylic acid polymers are investigated until the desired number of shell layers is fabricated around MXene layer structures. Finally, the core-shell nanocomposites were characterized by morphological and spectral techniques, demonstrating that the core-shell nanocomposites have more reaction sites and mesoporous structures. The as-obtained core-shell nanocomposites were evaluated with well adsorption capacities via three kinds of dyes. Thus the study of MXene based composites assembled by LbL provides a new choice for the application of MXene composite nanomaterials in wastewater treatment.

One-step fabrication of recyclable polyimide nanofiltration membranes with high selectivity and performance stability by a phase inversion-based process

A novel one-step strategy is proposed for the recyclable polyimide nanofiltration (PI-NF) membranes. By designing the chain structure, the soluble polyimide polymer with coexisted imide rings and flexible pendant groups are fabricated. With the polyimide polymer as matrix, the NF membranes with integrally skinned asymmetric architecture were obtained by a phase inversion method. The structure evolution was demonstrated by scanning electron microscope and atomic force microscope analyses. The rejections of prepared PI-NF membrane for Rose Bengal, PEG 1000 and typical salts under optimized conditions were 92, 91.78, 98.68%, respectively. The rejections of NF membranes for different salts followed the order: Na2SO4 > MgSO4 > NaCl > MgCl2. Furthermore, the fabricated polyimide-based NF membranes show a stable performance during long-time filtration process and exhibit a confirmed excellent recyclable property.

Rigid Polyimide Buffering Layer Enabling Silicon Nanoparticles Prolonged Cycling Life for Lithium Storage

Structural design is an effective avenue to alleviate the volume expansion of silicon anode. Surface coating and/or encapsulation shows a significant advantage. However, most coating layers show poor mechanical strength, resulting in fast fading electrochemical performance. In this work, commercial silicon nanoparticles coated with polyimide (PI) film have been synthesized by a simple mechanical stirring process. The polyimide polymer film endows silicon with structural characteristics of intrinsic high ionic conductivity, a stable SEI layer, and structure rigidness. The resulting composites display excellent capacity retention with about 1144 mAh g–1 after 430 cycles at 1 A g–1. The LiCoO2/Si@PI-15% full cell displays a high initial capacity of ∼126 mAh g–1 based on the cathode mass. After 50 cycles, it delivers 55 mAh g–1 reversible capacity with an average CE of ∼98% at 140 mA g–1.

Solvothermal synthesis of porous conjugated polymer with high surface area for efficient adsorption of organic and biomolecules

Aimed to prepare high efficient dye sorbent and control water pollution, herein we utilized solvothermal method to synthesize porous polyimide (PI) polymer with a large surface area using DMSO as solvent. Unlike the solid-state thermal polymerized PI with low surface area of 5 m2g−1, this PI material prepared in DMSO solvent possessed a large surface area of 430 m2g−1, which was beneficial for adsorption of organic dye in waste water, achieving a max MO adsorption of 200 mg g−1 three times higher than that of multiwalled carbon nanotube. The adsorption kinetics of dye molecules on PI was investigated in detail and the R2 value of 0.99071 for pseudo-second-order model confirms the adsorption was fitted best with Langmuir isotherm.

Structure and Gas Transport at the Polymer-Zeolite Interface: Insights from Molecular Dynamics Simulations.

We investigate the structure of polyimide (PI) at the surface of a silicalite zeolite (MFI), as part of a model hybrid organic-inorganic mixed matrix membrane system, through equilibrium molecular dynamics simulations. Furthermore, we report a comparison of the adsorption and transport characteristics of pure components CO2 and CH4 in PI, MFI, and PI-MFI composite membranes. It is seen that incorporation of MFI zeolite into PI results in the formation of densified polymer layers (rigidified region) near the surface, having thickness around 1.2 nm, before bulklike behavior of the polymer is attained, contrary to empirical fits suggesting the existence of an approximately 1 μm thick interface between the polymer and filler. This region offers an extra resistance to gas diffusion especially for the gas with a larger kinetic diameter, CH4, thus improving the CO2/CH4 kinetic selectivity in the PI-MFI composite membrane. Furthermore, we find that the kinetic selectivity of CO2 over CH4 in the rigidified region increases with temperature and that additivity of transport resistances in MFI, interfacial layer, and bulklike region of the polymer satisfactorily explains transport behavior in the composite sandwich investigated. The gas adsorption isotherms are extracted considering the dynamics and structural transitions in the PI and PI-MFI composite upon gas adsorption, and it is seen that the rigidified layer affects the gas adsorption in the polymer in the PI-MFI hybrid system. A significant increase in CO2/CH4 selectivity as well as gas permeability is observed in the PI-MFI composite membrane compared to that in the pure PI polymer membrane, which is correlated with the high selectivity of the rigidified interfacial layer in the polymer. Thus, while enhancing transport resistance, the rigidified layer is beneficial to membrane selectivity, leading to improved performance based on the Robeson upper bound plot for polymers.

Molecular Simulation and Evaluation of Molding Process of Polyimide Polymer Monolith

Molecular Simulation and Evaluation of Molding Process of Polyimide Polymer Monolith

Electrodeposition Though Polyelectrolyte Layers: Control of Interfacial Reaction, Deposition Rate, and Morphology of Deposited Thin Films

Demand for the development of deposition strategies of well-defined metal thin films with good chemical and physical characteristics has been rapidly growing in the field of various electronics applications. For example, copper electro- or electroless deposition has been widely utilized and investigated in microelectronics industry due to its low electrical resistivity and high electromigration resistance, as compared with aluminum. The conventional plating bath for electro- or electrolless copper deposition involves various chemical reagents such as deposition promoter (or inhibiter), brightening and smoothing agent, etc. These additives, typically organic molecules, sometimes cause mechanical problems due to inclusion of such additives during deposition process, and the discharge from the deposition bath can be a serious environmental issue. Therefore, the development of a facile process that enables additive-free deposition of metallic thin films as well as low environmental toxicity is an important challenge for the fabrication of microelectronic elements. In order to sustain the demand for generating multichip packaging systems for future electronic devices, it would be exceedingly useful to develop novel electrochemical deposition strategy with high-throughput capability that would allow stability of electrochemical reaction at higher deposition rate from plating bath without organic additives. In this context, direct metal deposition processes though ion conducting films have been investigated, such as the fabrication of metallic patterns on polymer substrates using ion-doped precursor films. A variety of direct deposition techniques have been introduced by several groups, including ours,1,2) based on photoinduced chemistry, thermal treatment, and selective chemical reduction for polyimide and other functional polymers. We have also reported a chemical metallization strategy that utilizes electrochemical constructive lithography with post lift-off process, which enables the fabrication of metal patterns on the polyimide substrate.3) The use of ion-doped precursors has triggered the development of new concept for electrochemical deposition. Herein we report for the first time that metallic thin films can be deposited through polyelectrolyte thin layers placed on the cathode electrode by the diffusion of metallic ions from the interior of polyelectrolyte, which is essentially different to conventional solution-phase electrodeposition processes (Fig. 1). By taking advantage of the cation-exchangeable nature of polyelectrolyte layers used for creation of solid interface, we demonstrate in this study how it is possible to merge the electrochemical deposition at cathode-polyelectrolyte interface and diffusion of cations through polyelectrolytes for development of novel solid electrodeposition (SED) process. As a proof of concept study, we herein present the successful electrochemical deposition of copper and nickel thin films at the interface between an electrode and ion-doped polyelectrolyte layers from the baths containing only metal salts (without any additives). The effect of cation concentration, temperature, and electrochemical deposition conditions on the deposition rate, growth process and morphology of the films has been investigated. Several electrochemical, microscopic and quantitative analysis revealed that the metallic films have been successfully deposited at the cathode-polyelectrolyte interface through ion exchange reaction in the polyelectrolyte layers, the deposition rate of which are determined by ion exchange rate of cations. This strategy offers an opportunity to translate solution-phase electrochemical deposition into a high-throughput, cost-effective, environmentally-friendly process for the fabrication of metal thin films on substrates. 1) Matsumura, Y. Enomoto, T. Tsuruoka, K. Akamatsu, H. Nawafune, Langmuir, 26, 12448-12454 (2010). 2) S. Ikeda, H. Yanagimoto, K. Akamatsu, H. Nawafune, Adv. Funct. Mater., 17, 889-897 (2007). 3) K. Akamatsu, Y. Fukumoto, T. Taniyama, T. Tsuruoka, H. Yanagimoto, H. Nawafune, Langmuir, 27, 11761-11766 (2011). Figure 1

Photomechanically coupled viscoelasticity of azobenzene polyimide polymer networks

Polyimide-based azobenzene polymer networks have demonstrated superior photomechanical performance over more conventional azobenzene-doped pendent and cross-linked polyacrylate networks. These materials exhibit larger yield stress and glass transition temperatures and thus provide robustness for active control of adaptive structures directly with polarized, visible light. Whereas photochemical reactions clearly lead to deformation, as indicated by a rotation of a linear polarized light source, temperature and viscoelasticity can also influence deformation and complicate interpretation of the photostrictive and shape memory constitutive behavior. To better understand this behavior we develop a rate-dependent constitutive model and experimentally quantify the material behavior in these materials. The rate dependent deformation induced in these materials is quantified experimentally through photomechanical stress measurements and infrared camera measurements. Bayesian uncertainty analysis is used to assess the role of internal polymer network evolution and azobenzene excitation on both thermomechanical and photomechanical deformation in the presence polarized light of different orientations. A modified Arrhenius relation is proposed and validated using Bayesian statistics which provide connections between free volume, shape memory, and polarized light.

Fabrication of Polyimide Membrane Incorporated with Functional Graphene Oxide for CO2 Separation: The Effects of GO Surface Modification on Membrane Performance.

Two kinds of isocyanate were used to modify graphene oxide (GO) samples. Then, polyimide (PI) hybrid membranes containing GO and modified GO were prepared by in situ polymerization. The permeation of CO2 and N2 was studied using these novel membranes. The morphology experiments showed that the isocyanate groups were successfully grafted on the surface of GO by replacement of the oxygen-containing functional groups. After modification, the surface polarity of the GO increased, and more defect structures were introduced into the GO surface. This resulted in a good distribution of more modified GO samples in the PI polymer matrix. Thus, the PI hybrid membranes incorporated by modified GO samples showed a high gas permeability and ideal selectivity of membranes. In addition, enhancement of the selectivity due to the solubility of CO2 played a major role in the increase in the separation performance of the hybrid membranes for CO2, although the diffusion coefficients for CO2 also increased. Both the higher condensability and the strong affinity between CO2 molecules and GO in the polymer matrix caused an enhancement of the solubility selectivity higher than the diffusion selectivity after GO surface modification.

Effect of Thin Film Platinum Microelectrode Granularity on Corrosion under Electrical Stimulation

One of the fundamental investigations on neural interfaces for stimulation of damaged and innervated areas of the brain is focused on microelectrode arrays (MEAs). Most notably are micromachined devices of platinum electrodes insulated between polyimide, a flexible and patternable polymer.(1) Electrochemical impedance and cyclic voltammetry (CV) testings have shown that metal electrodes degrade and delaminate after only 2500 cycles whereas glassy carbon electrodes are robust enough to withstand 250,000 cycles. (2) Atomic force microscopy (AFM) images, as shown in figures 1(a) and 1(b), were obtained to compare the two types of electrodes and analysis has shown that glassy carbon electrodes have a much smoother surface topography than that of platinum electrodes. Other studies have confirmed that increased surface roughness decreases circuit yield. (3) We submit that if the metal deposition process is optimized to produce a less granular surface of the platinum electrodes, then the electrochemical performance of these MEAs should improve. In order to test this concept, devices will be fabricated under four different sputtering conditions where two parameters will be modified: the vacuum pressure and the distance between the target and substrate. The control MEAs will be fabricated at a pressure of 0.01 mbar (~7.5 mTorr) and a distance of ~10 cm. The next two sets of devices will have the same distance as the control but the pressure will be reduced by 25% and 50%. For the last condition the vacuum will be kept at 0.01 mbar and the distance will decrease to 5 cm. After which the surface morphology of the different platinum films will be studied using AFM and the circuit resistance will be tested electrochemically in a three electrode cell.

STATISTIC METHODS OF POLYIMIDE ENAMEL ISOLATION DEFECTIVE NON-DESTRUCTIVE CONTROL AT THE CONDITIONS OF PRODUCTION

In this paper can be used to not-destructive technological testing of defects isolation enameled wire with polyimide polymer. The thesis is devoted to the statistical method for processing, comparison and analysis of results of measurements of parameters isolation it enameled wire because of mathematical model of trend for application in active technological monitoring is developed; to development used of the recommendations for parameters of such testing. Is theoretically justified and the possibility of a diminution of dependence of an error from a velocity of movement of a wire for want of quantifying of defects enameled isolation not destroying tests by high voltage. This work is devoted to the statistical method for processing, comparison and analysis of results of measurements of parameters of polyimide isolation. The method is operating not destroying technological monitoring an amount of enameled isolation defect. The dependence of average value of amount of defects for enameled wire ПЭЭИДХ2 – 200 with two–sheeted polyimide by isolation in a range of nominal diameter 0.56 mm is experimentally determined. The technological monitoring purpose is reducing of quantifying of enameled isolation defect.