Isobutyl Methacrylate Research Articles

Influence of Concentrations of Methacrylate and Acrylate Monomers on the Properties of Fiber Reinforced Polymethyl Methacrylate Denture Base Materials

Abstract The study aimed to evaluate the effects of adding different concentrations of 2 hydroxyethyl methacrylate (HEMA), 2-hydroxyethyl acrylate (HEA), ethyl methacrylate (EA) and isobutyl methacrylate (IBMA) monomers on the structural, thermal and mechanical properties of a fiber reinforced heat-polymerized acrylic resin. For each test, 126 acrylic resin specimens were fabricated and divided into 6 groups with 7 specimens each. One group was the control group, the other one is a fiber reinforced group and others were the test groups, which were formed according to the different concentrations of monomers. 6 mm length, and the weight ratio of 3% short glass fibers are added to acrylic powder polymerized by heating. The 2%, 5%, 10%, at 20 % ratios of different comonomers added to a monomer of MMA are composed of copolymer structures. Flexural strength was assessed with a three-point bending test using a universal testing machine. Impact strength testing was conducted using an impact test machine by the Charpy method. The analysis of the connection between acrylic resin and fiber by SEM and structural changes in the acrylic resin was investigated by FTIR spectroscopy. Data analyses using analysis of Kruskal-Wallis and Mann-Whitney U tests (α=0.05) significant difference tests showed that adding 2%, 5% HEMA and IBMA monomers significantly increased the flexural and impact strength compared to the control, only fiber and others group (P< 0.05). It is observed that the process of adding low concentration of HEMA and IBMA monomers improved certain mechanical properties of fiber reinforced with polymethylmethacrylate.

Evaluation of Different Improvement Methods of Bonding Between The Denture Base and Silicone-Based Liner

STATEMENT OF PROBLEM: Failure of the bond between the acrylic resin and silicone based liner material is commonly encountered in clinical practice. PURPOSE: Examine effect of different treatment methods on the tensile bond strength between a silicone –based liner and denture base before and after the thermocycling. MATERIAL AND METHODS: 140 test samples were fabricated. The samples were divided into 14 groups (n=10), according to the treatments applied. To enhance the bonding capacity between these materials, acrylic resin surface was modified using acetone, methyl methacrylate(MMA),isobutylmethacrylate(IBMA), 2-hydroxyethylmethacrylate (2-HEMA), sandblasted with110 μm aluminum oxide particles (110 μmAL2O3) and combination between sandblasting and each of these chemical material individually while in the group 11 ,silicone based liner was immersed in IBMA but in the group 12, acrylic resin surface was modified using sandblasting and a silicone based liner was immersed in IBMA .in addition ,in the group 13; silicone based liner was immersed in 2-HEMA and Group 14, acrylic resin surface was modified using Sandblasting and silicone based liner was immersed in2-HEMA. Silicone based liner was processed between 2 PMMA blocks. In each group, five samples were thermo cycled in water bath (5-55˚C) 500 cycles before tensile testing, whereas the other five were directly tested without thermocycling using Instron testing machine with speed rate (1 mm/minute) to measure tensile bond strength by MPa. All data were statistically analyzed by One way ANOVA, Tukey post hoc test and Paired sample t-test. RESULTS: There was no statistically significant difference between all tested groups where (p=0.154) before thermocycling while after the thermocycling, there was a statistically significant difference between all tested groups where (p=0.001) but there was no a statistically significant difference between control and all other tested groups. Furthermore, there was no statistically significant difference between before and after thermocycling in each group except group 9. CONCLUSIONS: The different treatment methods had poor effect on the tensile bond strength. Thermocycling had poor effect on the tensile bond strength between a silicone –based liner and denture base except group9 (acrylic resin surface was modified using sandblasting followed by IBMA application).

Glass Transition and Self-Diffusion of Unentangled Polymer Melts Nanoconfined by Different Interfaces

In nanoconfined thin films, numerous studies have revealed the thickness dependencies of different thermophysical properties, including the glass transition temperature (Tg) and self-diffusion coefficient (D). While quantitative relationships between these properties are well-known for bulk polymers, analogous relationships for nanoconfined polymers are still not clear. Herein, Tg−D relationships are studied under nanoconfinement using spectroscopic ellipsometry for measuring Tg and fluorescence recovery after photobleaching for measuring D. Poly(isobutyl methacrylate) (PiBMA) was selected as a model unentangled polymer, and it was nanoconfined to 14–300 nm thick films. Multilayered geometries incorporating PiBMA were constructed to systematically study the influence of free surfaces (i.e., polymer surfaces exposed directly to air, also called uncapped) and surfaces that were in contact with a secondary polymer (also called capped). This multilayer approach additionally allowed investigation of both relat...

Kinetics of the Reactions of NO3 Radical with Methacrylate Esters.

Two different experimental methods (relative rate and absolute rate methods) were used to measure the rate coefficients for the reactions of NO3 radical with six methacrylate esters: methyl methacrylate (MMA, k1), ethyl methacrylate (EMA, k2), propyl methacrylate (PMA, k3), isopropyl methacrylate (IPMA, k4), butyl methacrylate (BMA, k5), and isobutyl methacrylate (IBMA, k6). In the relative rate method, the loss of the esters relative to that of a reference compound was followed in a 7300 L Teflon-walled chamber at 298 ± 2 K and 1000 ± 5 hpa. In the absolute method, the temporal profiles of NO3 and N2O5 were followed by using a dual channel cavity ring-down spectrometer in the presence of an excess of ester in the 7300 L chamber. The rate coefficients from these two methods (weighted averages) in the units of 10-15 cm3 molecule-1 s-1 at 298 K are k1 = 2.98 ± 0.35, k2 = 4.67 ± 0.49, k3 = 5.23 ± 0.60, k4 = 7.91 ± 1.00, k5 = 5.91 ± 0.58, and k6 = 6.24 ± 0.66. The quoted uncertainties are at the 2σ level and include estimated systematic errors. Unweighted averages are also reported. In addition, the rate coefficient k7 for the reaction of NO3 radical with deuterated methyl methacrylate (MMA-d8) was measured by using the relative rate method to be essentially the same as k1. The trends in the measured rate coefficient with the length and nature of the alkyl group, along with the equivalence of k1 and k7, strongly suggest that the reaction of NO3 with the methacrylate esters proceeds via addition to the double bond on the methacrylate group. The present results are compared with those from previous studies. Using the measured values of the rate coefficients, along with those for reactions of these esters with OH, O3, and chlorine atoms, we calculated the atmospheric lifetimes of methacrylate esters. We suggest that NO3 radicals do contribute to the atmospheric loss of these unsaturated esters, but to a lesser extent than their reactions with OH and O3.

Local glass transition temperature Tg(z) of polystyrene next to different polymers: Hard vs. soft confinement.

The depth to which the local glass transition temperature Tg and alpha-relaxations are perturbed near a boundary is believed to be related to the characteristic length scales associated with cooperative dynamics in dynamically heterogeneous glasses. Following our recent work [R. R. Baglay and C. R. Roth, J. Chem. Phys. 143, 111101 (2015)] that measured a very broad 350-400 nm local Tg(z) profile across a glassy-rubbery interface of polystyrene (PS)/poly(n-butyl methacrylate) (PnBMA), we compare here how the Tg(z) profile in PS varies when changing the neighboring polymer from a lower Tg material to a higher Tg material. Here we report local Tg(z) profiles for PS when in contact with polysulfone (PSF), poly(methyl methacrylate) (PMMA), and poly(isobutyl methacrylate) (PiBMA). We find that the distance from the interface before bulk Tg of PS (Tgbulk=101 °C) is recovered depends on whether PS forms the high-Tg glassy component experiencing so-called soft confinement, z ≈ 225-250 nm for PS next to PiBMA (Tgbulk=62 °C) and PnBMA (Tgbulk=21 °C), or PS forms the low-Tg rubbery component experiencing hard confinement, z ≈ 100-125 nm for PS next to PSF (Tgbulk=186 °C) and PMMA (Tgbulk=120 °C). The depth to which these Tg(z) perturbations persist and the magnitude of the local Tg perturbation at the interface are independent of the difference in Tgbulk between the two polymers, the interaction parameter, and the chemical structure. We demonstrate that these broad, extended Tg(z) length scales appear to be universal across these different systems but show that the strong dynamical coupling across the dissimilar polymer-polymer interface only occurs when this interface has been annealed to equilibrium. We consider why dissimilar polymer-polymer interfaces exhibit continuous local dynamics across the interface in contrast to polymer-free surface, polymer-substrate, or polymer-liquid interfaces that show discontinuous local dynamics.

Temperature-dependent surface nanomechanical properties of a thermoplastic nanocomposite

In polymer nanocomposites, particle-polymer interactions influence the properties of the matrix polymer next to the particle surface, providing different physicochemical properties than in the bulk matrix. This region is often referred to as the interphase, but detailed characterization of its properties remains a challenge. Here we employ two atomic force microscopy (AFM) force methods, differing by a factor of about 15 in probing rate, to directly measure the surface nanomechanical properties of the transition region between filler particle and matrix over a controlled temperature range. The nanocomposite consists of poly(ethyl methacrylate) (PEMA) and poly(isobutyl methacrylate) (PiBMA) with a high concentration of hydrophobized silica nanoparticles. Both AFM methods demonstrate that the interphase region around a 40-nm-sized particle located on the surface of the nanocomposite could extend to 55–70nm, and the interphase exhibits a gradient distribution in surface nanomechanical properties. However, the slower probing rate provides somewhat lower numerical values for the surface stiffness. The analysis of the local glass transition temperature (Tg) of the interphase and the polymer matrix provides evidence for reduced stiffness of the polymer matrix at high particle concentration, a feature that we attribute to selective adsorption. These findings provide new insight into understanding the microstructure and mechanical properties of nanocomposites, which is of importance for designing nanomaterials.

Conflicting Confinement Effects on the Tg, Diffusivity, and Effective Viscosity of Polymer Films: A Case Study with Poly(isobutyl methacrylate) on Silica and Possible Resolution

The glass transition temperature (Tg), in-plane diffusivity (D), and effective viscosity (ηeff) were measured for the same thin film system of poly(isobutyl methacrylate) supported by silica (PiBMA/SiOx). We found that both the Tg and D were independent of the film thickness (h0), but ηeff decreased with decreasing h0. We envisage the different h0 dependencies to be caused by Tg, D, and ηeff being different functions of the local Tg’s (Tg,i) or viscosities (ηi), which vary with the film depth. By assuming a three-layer model and that Tg(h0) = ⟨Tg,i⟩, D(h0) ∼ kBT/⟨ηi⟩, and ηeff(h0) = h03/3Mtot(ηi), where ⟨...⟩ denotes spatial averaging and Mtot is the mobility of the films, we were able to account for the experimental data. By extending these ideas to the analogous data of polystyrene supported by silica (PS/SiOx), a resolution was found for the long-standing inconsistency regarding the effects of confinement on the dynamics of polymer films.

Effect of isobutyl methacrylate and methacrylic acid eluted from chairside denture hard reliners on enzymatic cellular antioxidants: An in vitro study in human primary buccal mucosal fibroblasts.

Aim:This study was conducted with the objective to evaluate the cytotoxicity of monomers isobutyl methacrylate (IBMA) and methacrylic acid (MA) in human buccal mucosal fibroblast primary cell culture and to study their effect on cellular enzymatic antioxidants-glutathione peroxidase (GPx), superoxide dismutase (SOD), and catalase (CAT).Materials and Methods:The tissue for fibroblast cell culture was harvested from oral buccal mucosa of a healthy donor. Fibroblast cells were plated at a density of 1 × 104 cells per well in 96-well tissue culture plates. Cells were exposed to various concentrations of IBMA and MA. The cell viability and various enzyme activities were evaluated 24 h after exposure to the above treatments. All tests were done in triplicate. Cell viability was assessed by trypan blue dye exclusion assay and all enzyme activities were done using assay kits from Cayman Chemicals, Ann Arbor, USA.Results:At all concentrations tested a statistically significant decrease in viability was observed in IBMA- and MA-treated cells. Around 42% cells were viable at the highest test concentration of IBMA (80 μmol/L) and only 20% cells were viable at the highest dose (144 μmol/L) of MA exposure (P < 0.05). Dose-dependent decrease in the GPx and SOD activities was observed in cells treated with IBMA and MA (P < 0.05). CAT activity was not detectable in the controls. However, a fall in CAT activity was detected in cells exposed to IBMA and MA at all concentrations tested (P < 0.05).Conclusion:IBMA and MA leaching out from the chairside denture hard reliners are cytotoxic on human buccal fibroblast primary cell cultures. This could be due to the oxidative stress caused by the generation of reactive oxygen species which is evidenced by the fall in activities of antioxidant enzymes (GPx, SOD, and CAT) and cytotoxicity.

Rheological response under nonisothermal stretching for immiscible blends of isotactic polypropylene and acrylate polymer

The addition of acrylate polymers with low molecular weight, such as poly(isobutyl methacrylate) (PIBM) and poly(methyl methacrylate) (PMMA), effectively enhances the force required to stretch a molten polypropylene (PP) at the nonisothermal condition without the enhancement of shear viscosity in the molten state. The mechanism of this phenomenon is found to be attributed to prompt solidification of PIBM and PMMA droplets, which deform greatly to the flow direction in the die land and near the die exit during the extrusion and stretching processes. After the die exit, the deformed droplets show the glassification prior to the crystallization of PP matrix because of the rapid cooling at stretching. Consequently, they behave like rigid fibers in a molten PP, which provide the excess stress by large shear deformation of the matrix between the dispersed glassy fibers during stretching.

Dielectric and spectroscopic properties of copolymers based on methacrylate carrying coumarin side group

ABSTRACTA methacrylic monomer 7–methacryloyloxy–4–methylcoumarin (MAOMC) was synthesized by reacting 7–hydroxy–4–methyl coumarin with methacryloyl chloride. Copolymerization of MAOMC with styrene (St), ethyl methacrylate (EMA), methyl methacrylate (MMA), n–butyl methacrylate (nBMA) and isobutyl methacrylate (IBMA) were performed by the free radical polymerization method (FRP) at low conversions. The resulting polymers were characterized by 1H NMR, FTIR, fluorescence and UV–vis spectroscopy. Dielectric properties of copolymers were measured by means of an impedance analyzer as a function of frequency and temperature. Dielectric measurements of copolymers prepared in a plate form were performed at room temperature over the frequency range 0.1 kHz–2 MHz and given as compared with each other. It was found that the dielectric constant of copolymers diminished in the applied frequency range. The optimized structural geometry and HOMO and LUMO energies of copolymers were carried out by density functional theory (DFT/B3LYP) method with 3−21G* as a basis set.

Night-time atmospheric degradation of a series of butyl methacrylates

Rate coefficients for the reactions of NO3 with n-butyl methacrylate (k1), iso-butyl methacrylate (k2) and tert-butyl methacrylate (k3) have been determined at 298K and atmospheric pressure using the relative rate method. The following rate coefficients (×10−15cm3molecule−1s−1) were obtained for the first time: k1=(5.5±2.6), k2=(5.8±2.8) and k3=(5.6±2.5).The NO3 reactions of these compounds could contribute to the removal of NOx and as NOy reservoirs. The potential importance for the tropospheric nitrogen budget of these reactions is discussed and atmospheric lifetimes for the butyl esters are calculated.

Dirt reference standard for surface cleanliness measurements

Thin films based on polymer poly(isobutyl methacrylate) (PIBMA), doped with carbon black particles deposited on steel plate substrates are proposed as dirt reference standards for cleanliness accreditation methods, particularly for instruments based on laser ablation. The films were made with the spin-coating method, obtaining layers with thickness between 4 and 17 μm. Carbon black particles with sizes smaller than 100 nm and concentrations between 1 and 27.6 mgr/cm3 were used. Characterization of the films was made by using absorbance measurements and laser ablation-induced photoacoustic.

An acrylic reline resin loaded with chlorhexidine: Insights on drug release

ObjectivesDental-biomaterials loaded with drugs are a promising strategy for local infection treatment. In this context, some studies suggest the incorporation of chlorhexidine (CHX), as an antifungal drug, in acrylic reline resins for the treatment of Candida albicans associated dental infections. The purpose of this study was to evaluate the release of CHX from one acrylic reline resin, Kooliner (K). Furthermore, the effect of different media conditions and the drug loading on the CHX release was assessed. MethodsResin specimens were prepared from a hard denture reline material based on poly(ethylmethacrylate) (PEMA) and isobutylmethacrylate (IBMA) containing 2.5, 5.0, 7.5 and 10wt% of CHX. The CHX-loaded resins were incubated in water and artificial saliva (at pH 7) for up to 28 days at 37°C. Chlorhexidine content was determined by UV-spectroscopy (255nm). ResultsCHX release was influenced by media composition and drug loading. CHX demonstrated a similar release profile in the two media, however the water showed the higher amount of release in comparison with the inorganic mimetic saliva. CHX release increased proportionally to the concentration of the CHX added, in a linear trend line. Moreover, a high percentage of CHX was not release up to 28 days. ConclusionsDespite the limitations of the present investigation, results from the present study highlight the need of evaluating drug release not only in water but also in saliva. Strategies that increase the complete release of drug from the material should be investigated in order to prevent the development of multiresistant strains.

An Investigation into the Integrity of Fit of Provisional Crowns made over a Dental Implant Analogue Using Two Current Proprietary Provisional Crown Materials Compared to a Proprietary 'Snap On' Provisional Core

The aim of this study was to investigate the marginal accuracy of three currently used methods of direct provisional crown construction for the accuracy of marginal fit during in vitro fabrication. Three groups of provisional crowns were investigated using a modified McLean and von Fraunhofer technique. Proprietary provisional crown coping modified to tooth shape with a Bis-acryl temporary material was compared to Bis-GMA and isobutyl methacrylate resin provisional crowns with modified margins using a light cured flowable composite and ‘bead on’ isobutyl methacrylate respectively. Data was analyzed with the Mann Whitney test (a = 0 .05). Reliability was determined using the Bland Altman test. Bis-GMA acryl resin composite relined with flowable composite produced significantly better fitting restorations compared to the two other groups.

Investigation of flexural strength and cytotoxicity of acrylic resin copolymers by using different polymerization methods.

PURPOSEThe aim of this study was to appraise the some mechanical properties of polymethyl methacrylate based denture base resin polymerized by copolymerization mechanism, and to investigate the cytotoxic effect of these copolymer resins.MATERIALS AND METHODS2-hydroxyethyl methacrylate (HEMA) and isobutyl methacrylate (IBMA) were added to monomers of conventional heat polymerized and injection-molded poly methyl methacrylate (PMMA) resin contents of 2%, 3%, and 5% by volume and polymerization was carried out. Three-point bending test was performed to detect flexural strength and the elasticity modulus of the resins. To determine the statistical differences between the study groups, the Kruskall-Wallis test was performed. Then pairwise comparisons were performed between significant groups by Mann-Whitney U test. Agar-overlay test was performed to determine cytotoxic effect of copolymer resins. Chemical analysis was determined by FTIR spectrum.RESULTSSynthesis of the copolymer was approved by FTIR spectroscopy. Within the conventional heat-polymerized group maximum transverse strength had been seen in the HEMA 2% concentration; however, when the concentration ratio increased, the strength decreased. In the injection-molded group, maximum transverse strength had been seen in the IBMA 2% concentration; also as the concentration ratio increased, the strength decreased. Only IBMA showed no cytotoxic effect at low concentrations when both two polymerization methods applied while HEMA showed cytotoxic effect in the injection-molded resins.CONCLUSIONWithin the limitations of this study, it may be concluded that IBMA and HEMA may be used in low concentration and at high temperature to obtain non-cytotoxic and durable copolymer structure.

Entropy driven chain effects on ligation chemistry.

We report the investigation of fundamental entropic chain effects that enable the tuning of modular ligation chemistry - for example dynamic Diels-Alder (DA) reactions in materials applications - not only classically via the chemistry of the applied reaction sites, but also via the physical and steric properties of the molecules that are being joined. Having a substantial impact on the reaction equilibrium of the reversible ligation chemistry, these effects are important when transferring reactions from small molecule studies to larger or other entropically very dissimilar systems. The effects on the DA equilibrium and thus the temperature dependent degree of debonding (%debond) of different cyclopentadienyl (di-)functional poly(meth-)acrylate backbones (poly(methyl methacrylate), poly(iso-butyl methacrylate), poly(tert-butyl methacrylate), poly(iso-butyl acrylate), poly(n-butyl acrylate), poly(tert-butyl acrylate), poly(methyl acrylate) and poly(isobornyl acrylate)), linked via a difunctional cyanodithioester (CDTE) were examined via high temperature (HT) NMR spectroscopy as well as temperature dependent (TD) SEC measurements. A significant impact of not only chain mass and length with a difference in the degree of debonding of up to 30% for different lengths of macromonomers of the same polymer type but - remarkably - as well the chain stiffness with a difference in bonding degrees of nearly 20% for isomeric poly(butyl acrylates) is found. The results were predicted, reproduced and interpreted via quantum chemical calculations, leading to a better understanding of the underlying entropic principles.

Self-stratifying coatings based on Schiff base epoxy resins

Schiff base epoxy resin was used as a component of self-stratifying compositions, in which different acrylic resins were used. The degree of stratification was determined using the ATR FTIR spectroscopy and microscopy technique. Results were compared with those for commercial epoxy resins with a comparable epoxy number. A determination was made of the mechanical properties of the coatings obtained. Based on the previous studies, it was concluded that Schiff base epoxy resin in a film-forming composition behaves in a similar manner to BPA-based epoxy resins. The best mechanical properties and a high degree of stratification were achieved using a Schiff base epoxy resin/poly(isobutyl methacrylate) composition. Use of a self-stratifying composition not only reduces the time and cost of preparing a multilayer coating system, thanks to the formation of two layers in one application, but also causes the Schiff based epoxy coatings to become more flexible.

Surface energy gradient driven convection for generating nanoscale and microscale patterned polymer films using photosensitizers

The Marangoni effect describes how fluid flows in response to gradients in surface energy. This phenomenon could be broadly harnessed to pattern the surface topography of polymer films if generalizable techniques for programming surface energy gradients existed. Here, a near UV–visible light (NUV–vis) photosensitizer, 9,10-dibromo-anthracene (DBA), was doped into thin films of a model polymer, poly(isobutyl methacrylate). After exposure to light through a photomask and heating above the glass transition, thermolysis of photo-oxidized DBA and grafting to the polymer promoted flow of the film material into the exposed regions. This mechanism did not significantly alter the molecular weight of PiBMA or the film's glass transition temperature, but resulted in an increase in film surface energy as indicated by a decrease in water contact angle. Film height variations of 580 nm were produced using a mask with 12.5 μm features; a mask with 800 nm features was also employed to generate topographic features of corresponding width without expensive contacting equipment. Due to the broad absorbance spectra of DBA, highly accessible and/or unconventional light sources may be employed in this process; this advantage was demonstrated by patterning with sunlight. The nonspecific radical-mediated nature of the DBA grafting reaction makes this a promising approach for many classes of polymers. © 2014 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2014, 52, 1195–1202

Assessment of the skin sensitising potency of the lower alkyl methacrylate esters

There is continued interest in, and imperatives for, the classification of contact allergens according to their relative skin sensitising potency. However, achieving that end can prove problematic, not least when there is an apparent lack of concordance between experimental assessments of potency and the prevalence allergic contact dermatitis as judged by clinical experience. For the purpose of exploring this issue, and illustrating the important considerations that are required to reach sound judgements about potency categorisation, the lower alkyl methacrylate esters (LAM) have been employed here as a case study.Although the sensitising potential of methyl methacrylate (MMA) has been reviewed previously, there is available new information that is relevant for assessment of skin sensitising potency. Moreover, for the purposes of this article, analyses have been extended to include also other LAM for which relevant data are available: ethyl methacrylate (EMA), n-butyl methacrylate (nBMA), isobutyl methacrylate (iBMA), and 2-ethylhexyl methacrylate (EHMA).In addressing the skin sensitising activity of these chemicals and in drawing conclusions regarding relative potency, a number of sources of information has been considered, including estimates of potency derived from local lymph node assay (LLNA) data, the results of guinea pig assays, and data derived from in silico methods and from recently developed in vitro approaches. Moreover, clinical experience of skin sensitisation of humans by LAM has also been evaluated.The conclusion drawn is that MMA and other LAM are contact allergens, but that none of these chemicals has any more than weak skin sensitising potency. We have also explored here the possible bases for this modest sensitising activity.Finally, the nature of exposure to LAM has been reviewed briefly and on the basis of that information, together with an understanding of skin sensitising potency, a risk assessment has been prepared.

Effects of polymer doping on dielectric and electro-optical parameters of nematic liquid crystal

Poly(isobutyl methacrylate) (PiBMA) polymer doped in pure p-Ethoxybenzylidene p-Heptylaniline (EBHA) mesomaterial has been investigated in the present study. The dielectric and electro-optical parameters of EBHA having nematic phase were altered due to the addition of polymer in different concentration. The strong dopant concentration dependent nature of negative dielectric anisotropy and conductivity are the interesting results of the present polymer doped nematic liquid crystal (NLC) system. The present composite shows its useful application in low charge consumable devices due to the easy charge transportation phenomenon. The investigated polymer doped-NLC system exhibiting increased negative dielectric anisotropy and high conductivity may prove to be advantageous for video applications in vertically aligned cells. POLYM. ENG. SCI., 55:414–420, 2015. © 2014 Society of Plastics Engineers