Cross-linking Monomer Research Articles

Macroporous scaffolds of cross-linked Poly(ɛ-caprolactone) via high internal phase emulsion templating

A high internal phase emulsion based ring-opening polymerization (HIPE-ROP) of ɛ-caprolactone (CL) was conducted to fabricate macroporous scaffold in a single-step. An oil-in-oil HIPE of CL was formed using high molecular weight olefin (C10-C16) dispersed in continuous medium comprised of CL, a bifunctional cross-linking monomer bis-ɛ-caprolactone-4-yl (BCY) and catalyst stannous octoate (Sn(Oct)2). The emulsion was stabilized using nonionic surfactant, pluronic F127 and polymerization was conducted at 120 °C without any inert atmosphere for a period of 8 h. Complete monomer conversion and cross-linking was achieved and am acroporous scaffold of desired shape was obtained, having in-situ generated porosity and interconnected pores. All chemicals were purposely used without any purification and the high temperature process prevented deactivation of catalyst. The HIPE-ROP developed in this way was found to be highly feasible for conducting otherwise moisture sensitive organo-metallic catalyst based ROP. The morphology of HIPE was directly transferred to macroporous structure of the scaffold in this process where pore size was reproducibly controlled by variation in volume fraction of dispersed phase and cross-link density. The resultant macroporous scaffold showed superior compressive loading and swelling capacity. The porous scaffolds also exhibited excellent osteoblast (MG63) attachment and proliferation. HIPE-ROP based macroporous scaffold of cross-linked PCL thus developed paved a new route to create porous scaffolds of aliphatic polyesters in a single step. The method also reflected high commercial viability by potential conversion into a continuous process.

A Novel One-Pot Synthesis of Poly(Propylene Carbonate) Containing Cross-Linked Networks by Copolymerization of Carbon Dioxide, Propylene Oxide, Maleic Anhydride, and Furfuryl Glycidyl Ether.

The thermoplastic poly(propylene carbonate) (PPC) containing cross-linked networks was one-pot synthesized by copolymerization of carbon dioxide, propylene oxide (PO), maleic anhydride (MA), and furfuryl glycidyl ether (FGE). The copolymers were characterized by Fourier transform infrared spectroscopy (FT-IR), gel permeation chromatography (GPC), differential scanning calorimetry (DSC), and thermogravimetric analysis (TGA) measurements. The thermal and dimensional stability of the copolymers were improved. When the MA and FGE load increased from 1 mol% to 4 mol% of PO, the copolymers contained the gel contents of 11.0%–26.1% and their yields were about double that of the PPC. The 5% weight-loss degradation temperatures (Td,-5%) and the maximum weight-loss degradation temperatures (Td,max) increased from 149.7–271.3 °C and from 282.6–288.6 °C, respectively, corresponding to 217.1 °C and 239.0 °C of PPC. Additionally, the hot-set elongation tests showed that the copolymers exhibited elasticity and dimensional stability with the minimum permanent deformation of 6.5% which was far less than that of PPC of 157.2%, while the tensile strengths were a little lower than that of PPC because of the following two conflicting factors, cross-links and flexibility of the units formed by the introduced third monomers, MA and FGE. In brief, we provide a novel method of one-pot synthesis of PPC containing cross-linked networks. According to this idea, the properties would be more extensively regulated by changing the cross-linkable monomers.

Crosslinkable Nitroxide Radical Polymer for Energy Storage Applications

Due to the amount of waste generated by lithium ion batteries (LIB) disposal, a more environmentally friendly option such as organic batteries, is desired to fulfill the need of this large market. For many years, alternatives to LIBs have been researched, including the use of conductive polymers for completely organic batteries. Redox-active polymers, such as conjugated polyaniline and organic radical poly(2,2,6,6-tetramethylpiperidinyloxy-4-ylmethacrylate) (PTMA), are being studied as electrode materials for organic batteries. As linear PTMA may dissolve in the electrolyte solution and thus degrade battery capacity, crosslinked PTMA is gaining interest as a cathode material. A balance must be struck, however, as diffusion of the electrolyte solution into the polymer may become limited at sufficiently high crosslink density. To balance these competing mechanisms, a random copolymer consisting of PTMA monomer and glycidyl methacrylate (GMA), a UV and thermally crosslinkable monomer, is synthesized (P(TMA-GMA)) and the mechanism of redox activity is studied. This new PTMA copolymer is synthesized using free radical chain-growth polymerization and is then oxidized to produce the characteristic organic radical. Linear P(TMA-GMA) is characterized using UV-VIS, NMR spectroscopy, and gel permeation chromatography. The effect of crosslinking on the thermal properties and the temperature for thermally induced crosslinking is analyzed using differential scanning calorimetry. The crosslink density is calculated for each composition using the linear P(TMA-GMA) molecular weight and solvent uptake of the crosslinked P(TMA-GMA). Determining the most favored crosslink density is necessary for balancing electrolyte diffusion with the dissolution of the polymer. The electrochemical properties of the crosslinked P(TMA-GMA) is studied using cyclic voltammetry (CV) to determine if crosslinking impacts the redox properties. Preliminary results have found that the crosslinked P(TMA-GMA) exhibits a change in the shape of the CV curve and peak heights, associated with some change in the crosslinked polymers electroactivity. In addition, the crosslink density of the P(TMA-GMA) with 5 mol% GMA is quantified and is similar to previous studies of poly(ethylene glycol). Finally, the thermal properties are represented by a glass transition temperature that did not significantly change with varying GMA content. This new P(TMA-GMA) shows promise for application in organic batteries by providing a processable yet crosslinkable alternative to PTMA.

Fluorinated Glycopolymers as Reduction-responsive 19F MRI Agents for Targeted Imaging of Cancer.

Imaging agents that can be targeted to specific diseases and respond to the microenvironment of the diseased tissue are of considerable interest due to their potential in diagnosing and managing diseases. Here we report a new class of branched fluorinated glycopolymers as 19F MRI contrast agents that respond to a reductive environment, for targeted imaging of cancer. The fluorinated glycopolymers can be readily prepared by a one-pot RAFT polymerization of glucose- and fluorine-containing monomers in the presence of a disulfide-containing cross-linking monomer. The incorporation of glucose units along the polymer chain enables these fluorinated glycopolymers to effectively target cancer cells due to interactions with the overexpressed sugar transporters present on the cell surface. In addition, the polymers exhibit an enhanced 19F MRI signal in response to a reductive environment, one of the unique hallmarks of many cancer cells, demonstrating their potential as promising candidates for targeted imaging of cancer.

Preparation of molecularly imprinted polymers coupled with high-performance liquid chromatography for the selective extraction of salidroside from Rhodiola crenulata

Salidroside is one of the bio-active compounds found in Rhodiola crenulata. To find an easy, time saving and efficient way to extract, purify and enrich salidroside from Rhodiola and other natural plants, we prepared a highly selective molecularly imprinted polymer (MIP) for extraction and preconcentration of salidroside using salidroside (SD) as a template, acrylamide (AM) as a functional monomer, ethylene glycol dimethacrylate (EDMA) as a crosslinking monomer, and dimethyl formamide (DMF) as a porogen. The performance of the MIPs was evaluated through selective recognition capacity and adsorption isotherms and kinetics. The results showed that MIPs possessed excellent specific recognition toward SD and could effectively discriminate its structural analogue. The application of the developed MIPs as a selective sorbent for solid-phase extraction (SPE) of SD was also investigated. Under the optimum conditions, a rapid, economical, and efficient method based upon MIP-SPE coupled with high-performance liquid chromatography (HPLC) was developed for the determination of SD in Rhodiola crenulata. The method showed satisfactory recoveries (from spiked real samples at 3 fortification levels of 0.5, 1 and 10 mg L−1) of 88.74%- 97.64% with relative standard deviations (RSDs) ranging from 2.05%–3.54%. Furthermore, MIP-SPE was successfully used to separate and purify SD from different parts in Rhodiola crenulata and it should be available for determination of salidroside in others herbs.

Molecularly imprinted based surface plasmon resonance nanosensors for microalbumin detection

Human serum albumin (HSA) is a major blood plasma protein also found in urine where its existence may be a marker of some types of liver or kidney dysfunction. Herein, we fabricated a novel surface plasmon resonance (SPR) nanosensor for selective, sensitive, and label-free microalbumin detection both in aqueous and urine sample solutions. First, HSA-imprinted nanoparticles were synthesized, which consist of ethylene glycol dimethacrylate and N-methacryloyl-L-leucine methyl ester as a cross-linker and functional monomer. The nanoparticles were characterized by zeta-size and scanning electron microscope analyses and were dropped onto the SPR chip surface to make HSA sensitive nanosensor. Characterization studies of HSA-imprinted SPR chip were carried out by atomic force microscopy, Fourier-transform infrared spectroscopy, contact angle, and ellipsometer. The limit of detection and limit of quantification values of HSA-imprinted SPR nanosensor were calculated as 0.7 pM and 1.9 pM for the concentration range of 0.15–500 nM. Selectivity studies of HSA-imprinted SPR nanosensor were achieved with hemoglobin and transferrin proteins which were chosen as competitor molecules. HSA-imprinted SPR nanosensor was displayed highly selective and sensitive to HSA.

Poly(styryl bisphosphonate) nanoparticles with a narrow size distribution: Synthesis, characterization and antibacterial applications

Bacterial resistance to antibiotics is a major challenge in health research. A recent approach to combat this resistance is by interfering with vital bacterial functional systems. Calcium ions play an important role in bacterial functions such as bacterial cell stability, regulation of virulence genes, and in the function of various intracellular proteins. Bisphosphonate compounds have a high affinity for calcium ions and the antibacterial activity of bisphosphonates in combination with antibiotics has been recently studied. However, the antibacterial behavior of the bisphosphonate group itself has hardly been investigated. New cross-linked poly(styryl bisphosphonate) nanoparticles (poly(StBP) NPs) with a narrow size distribution and high yield were engineered using a dispersion copolymerization of styryl bisphosphonate monomer with the cross-linking monomer triethylene glycol diacrylate and the primary amino monomer N-(3-aminopropyl) methacrylamide hydrochloride. The diameter and size distribution were controlled by changing various polymerization parameters. Fluorescent poly(StBP) NPs were prepared by covalent binding of the primary amino groups on the poly(StBP) NPs surface to the dye BODIPY-FL-NHS ester; these NPs demonstrated a strong affinity for calcium ions. Antibacterial properties of optimal poly(StBP) NPs were studied compared to control NPs, which contain a methoxy group instead the bisphosphonate functional group. Unlike the control NPs, the poly(StBP) NPs demonstrated a significant antibacterial activity for both Gram negative (Escherichia coli and Pseudomonas aeruginosa) and Gram-positive (Staphylococcus aureus and Bacillius subtilis) bacteria.

Allysine modifications perturb tropoelastin structure and mobility on a local and global scale

Elastin provides elastic tissues with resilience through stretch and recoil cycles, and is primarily made of its extensively cross-linked monomer, tropoelastin. Here, we leverage the recently published full atomistic model of tropoelastin to assess how allysine modifications, which are essential to cross-linking, contribute to the dynamics and structural changes that occur in tropoelastin in the context of elastin assembly. We used replica exchange molecular dynamics to generate structural ensembles of allysine containing tropoelastin. We conducted principal component analysis on these ensembles and found that the molecule departs from the canonical structural ensemble. Furthermore, we showed that, while the canonical scissors-twist movement was retained, new movements emerged that deviated from those of the wild type protein, providing evidence for the involvement of a variety of molecular motions in elastin assembly. Additionally, we highlighted secondary structural changes and linked these perturbations to the longevity of specific salt bridges. We propose a model where allysines in tropoelastin contribute to hierarchical elastin assembly through global and local perturbations to molecular structure and dynamics.

Light- and pH-responsive self-healing hydrogel

A self-healing hydrogel was synthesized via the multi-component reaction of azobenzene-methacrylamide, β-CD and 3-methacrylamido phenylboronic acid. The orthogonal method was applied to analyze the influence of host–guest inclusion complexation, cross-linker and phenylboronic acid monomers content on mechanical properties and healing efficiency of the hydrogel. The results indicated that hydrogel showed autonomic self-healing behavior. The hydrogel demonstrated light-switchable self-healing ability and pH-sensitive swelling ratio. It was found that hydrogel showed high elongation, excellent resilience and low elastic hysteresis. The design of the combined host–guest interactions and boronate esters on the hydrogel showed advantage for improving the mechanical, self-healing and recovery properties simultaneously.

Methacrylate monomer as an alternative to styrene in typical polyester–styrene copolymers

ABSTRACTThis study presents the research on the influence of crosslinking monomers [styrene and diethylene glycol dimethacrylate (DEGDMA)] on the properties of unsaturated polyester resins (UPRs). Syntheses of the unsaturated polyesters (UPs) modified with benzyl alcohol were carried out. Then, each polyester was used in preparation of five resin solutions with different amounts of crosslinking monomers acting as reactive diluents. These diluents improve the processability of UPs reducing their viscosities. They also take part in crosslinking of resins during copolymerization process. The properties of the prepared UPRs systems were investigated before and after the curing process. The measurements of their viscosity, reactivity, mechanical properties, thermal stability (thermogravimetry), and dynamic mechanical analysis were performed. Resins where DEGDMA was used as reactive diluent were characterized by the largest viscosities in comparison to styrene ones. The type of the used monomer influenced also degree of the resin crosslinking. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47735.

Selective PQQPFPQQ Gluten Epitope Chemical Sensor with a Molecularly Imprinted Polymer Recognition Unit and an Extended-Gate Field-Effect Transistor Transduction Unit.

A molecularly imprinted polymer (MIP) recognition system was devised for selective determination of an immunogenic gluten octamer epitope, PQQPFPQQ. For that, a thin MIP film was devised, guided by density functional theory calculations, and then synthesized to become the chemosensor recognition unit. Bis(bithiophene)-based cross-linking and functional monomers were used for this synthesis. An extended-gate field-effect transistor (EG-FET) was used as the transduction unit. The EG-FET gate surface was coated with the PQQPFPQQ-templated MIP film, by electropolymerization, to result in a complete chemosensor. X-ray photoelectron spectroscopy analysis confirmed the presence of the PQQPFPQQ epitope, and its removal from the MIP film. The chemosensor selectively discriminated between the octamer analyte and another peptide of the same number of amino acids but with two of them mismatched (PQQQFPPQ). The chemosensor was validated with respect to both the PQQPFPQQ analyte and a real gluten extract from semolina flour. It was capable to determine PQQPFPQQ in the concentration range of 0.5-45 ppm with the limit of detection (LOD) = 0.11 ppm. Moreover, it was capable of determining gluten in real samples in the concentration range of 4-25 ppm with LOD = 4 ppm, which is a value sufficient for discriminating between gluten-free and non-gluten-free food products. The gluten content in semolina flour determined with the chemosensor well correlated with that determined with a commercial ELISA gluten kit. The Langmuir, Freundlich, and Langmuir-Freundlich isotherms were fitted to the epitope sorption data. The sorption parameters determined from these isotherms indicated that the imprinted cavities were quite homogeneous and that the epitope analyte was chemisorbed in them.

Understanding molecular features of aggregation-resistant tau conformer using oxidized monomer

BackgroundAggregation of tau into paired helical filament (PHF) is a hallmark of Alzheimer's disease (AD), and Cys-mediated disulfide bond formation plays a vital role in tau fibrillation. While intermolecular disulfide bond between Cys residues in microtubule-binding repeat (MTBR) region facilitates tau aggregation, intramolecular disulfide bond attenuates the same, though the molecular basis for such phenomenon remains obscure. Thus intramolecular disulfide-bonded tau monomer might be an excellent model to understand the unique features of aggregation-resistant tau conformer. MethodsWe synthesized the Cys cross-linked tau40 monomer by oxidation and characterized the altered conformational dynamics in the molecule by Hydrogen-deuterium exchange, limited proteolysis and fluorescence quenching. ResultsDeuterium exchange study showed that rigidity was imparted in the core PHF region of oxidized tau40 in MTBR segment, consisting of the fundamental PHF6 motif. Conformational rigidity was prominent in C-terminal tail region also. Limited proteolysis supported reduced accessibility of MTBR region in the molecule. ConclusionsPHF formation of oxidized tau40 might be attenuated either by induction of intramolecular H-bonding between the regions of high β-structure propensity in second and third MTBR (R2, R3), thus preventing intermolecular interaction between them, or by imparted rigidity in R2–R3, preventing the formation of extended β-structure preceding fibrillation. Data indicated plausible effect of conformational adaptation on the nucleation process of oxidized tau40 assembly. General significanceOur findings unravel the essential molecular features of aggregation-resistant tau conformer. Therapeutics stabilizing such conformers in vivo might be of high benefit in arresting tau assembly during AD and other tauopathies.

Decreasing the dielectric constant and water uptake by introducing hydrophobic cross-linked networks into co-polyimide films

The high durability of low-k value is the key parameter for the low dielectric materials especially used under humid conditions, because the k value is very sensitive to moisture. Here, to decrease the dielectric constant and improve the water resistance, a series of novel co-polyimides are successfully prepared based on cross-linkable diamine monomer by a two-step pathway combining polymerization and crosslinking reaction. It is intriguingly found that with the gradual increase content of cross-linkable group, the dielectric properties, water resistance as well as thermal and mechanical properties of those co-polyimides can be finely tuned. After cross-linking, the dielectric properties are significantly enhanced and the film surface changed from hydrophilic (78.7–89.2°) to hydrophobic (93.0–104.2°), which endow the cross-linked films with superior water resistance and high durability of low-k value. The best performance is obtained for cross-linked co-polyimide (CL-Co-PI-4) containing 30% cross-linkable group. The CL-Co-PI-4 exhibits low dielectric constant of 2.32 and dielectric loss of 0.016 at 1 MHz. Excitingly, the CL-Co-PI-4 demonstrates an extremely low water uptake of 0.051 ± 0.010%, which represents the best water resistance for the reported polyimides. After exposing to different humidity conditions for 12 h, the increasing percentage of k value is very low and below 0.84%. The CL-Co-PI-4 still keep its k value below 2.35 after equilibrating at 75% R.H. for 14 days. The excellent moisture resistance and overall performance make the CL-Co-PI-4 a good candidate for dielectric material under both dry and humid conditions.

Organogels containing immobilized shear thickening fluid and their composites with polyurethane elastomer

This article concerns investigation on immobilization of shear thickening fluids (STFs) in form of organogel obtained with the use of oligo(propylene glycol) diacrylate (PPGA) as a cross-linking monomer. The STF used was a suspension of nanosilica in oligo(propylene glycol). Organogel particles were prepared by dropwise addition of the STF containing PPGA into silicone oil followed by thermal cross-linking of the monomer. Organogel particles were used to prepare PUR-matrix composite. The rheological properties of organogels and composites were studied by oscillatory measurements. The measurements showed significant changes in internal structure of the samples, which are most likely connected with shear thickening. It was demonstrated that manufactured composites exhibited 20% higher impact absorption than that of cast polyurethane elastomer. Presented method of STF immobilization allows to obtain organogel particles that can be widely used for intelligent materials preparation due to their good stability and impact absorption ability.

Preparation of a poly(1, 6-hexylene dimethacrylate) conventional size high performance liquid chromatographic monolithic column for separation of small molecules

A porous monolithic column was prepared by in situ free-radical polymerization in a stainless steel column (4.6 mm i.d. × 100 mm). The polymerization reacted using 1,6-hexylene dimethacrylate as single crosslinking monomer, methanol and 1-dodecanol as the binary porogens and 2,2-azobisisobutyronitrile asinitiator. During the column preparation process, the ratio of monomer to porogen was optimized to obtain the best column. The chemical groups and morphology of monolithic column were characterized by the Fourier transform infrared spectroscopy and scanning electron microscopy, respectively. Furthermore, the influence of mobile phase composition and flow rate on the separation of aromatic compounds was investigated.The results showed that the poly(1,6-hexylene dimethacrylate) monolithic column had high mechanical stability at flow rate of 4 mL/min. Phenol, 1-naphthol, biphenyl and phenanthrene were easily separated on the prepared monolithic column using acetonitrile/water (58/42, v/v) as mobile phase at flow rate of 2 mL/min. The relative standard deviation of run-to-run and column-to-column of the retention times for the four standard compounds were <0.3% and 3.3%, respectively. Three kinds of small molecules (phenols, aromatic hydrocarbons, aromatic acids) were successfully separated on the poly(1,6-hexylene dimethacrylate) monolithic column. The possible chromatogramphic retention mechanism on poly(1,6-hexylene dimethacrylate) monolithic column was determined as hydrophobic interaction and dipole-dipole interaction. The conventional size poly(1,6-hexylene dimethacrylate) monolithic column has potential to separate small molecule compounds rapidly by high performance liquid chromatography.

Poly(glycidyl methacrylate-co-1,4-dimethacryloyloxybenzene) monodisperse microspheres - synthesis, characterization and application as chromatographic packings in RP-HPLC

The study describes the synthesis of porous microspheres with glycidyl methacrylate (GMA) and 1,4-dimethacryloyloxybenzene (DMB) using the seed swelling polymerization. As a shape template the polystyrene (PS) seed obtained via the dispersion polymerization was used. Oxirane, esters and aromatic groups are present in the structure of copolymers. Changing the reaction mixture composition – the amounts of crosslinking monomer and PS seed, almost monosized poly(GMA-co-DMB) microspheres of the diameters in the range of 8.20 μm to 11.61 μm and highly developed porous structure with specific surface area (SBET) up to 353 m2/g were obtained. The pore size distribution and the volume of pores measured for the copolymer in the dry and the swollen states differ. In the dry state in the internal copolymer structure mesopores were observed whereas in the swollen state additionally micro- and macropores appeared. The copolymer obtained with the equimolar mixture of monomers was applied as the column packing material and tested in the reverse-phase HPLC. The isocratic separation of alkylbenzenes was achieved with satisfactory resolution using the 100 × 4.6 mm i.d. column with the acetonitrile/phosphate buffer mobile phase. The theoretical plate numbers up to 12,000 were obtained for benzene as the analyte. Using the retention indices for the test compounds it was found that the retention mechanism on the studied copolymer is the sum of π-π hydrophobic interactions, dipole interactions and to a smaller extent of hydrogen acceptance interactions rather than hydrogen donation interactions.

The influence of monomer/solvent feed ratio on POEGDMA thermoresponsive hydrogels: Radiation-induced synthesis, swelling properties and VPTT

The oligo(ethylene glycol) dimethacrylate (OEGDMA), one of the most commonly utilized crosslinking monomers, was used to tailor thermoresponsive POEGDMA hydrogels by varying the monomer/solvent feed ratio (from 10 to 100 wt% of monomer). For the first time, synthesis of different POEGDMA homopolymeric networks was performed by gamma radiation, and due to the expected thermoresponsiveness their temperature-dependent properties were extensively analysed. The sol-gel study was performed as the first step after radiation-induced synthesis. The swelling properties were investigated over the wide pH (2.2–9.0) and temperature (5–80 °C) range. Characterization of structure and properties was additionally conducted by SEM, DSC, FTIR, and UV–Vis spectroscopy. The results indicated that all POEGDMA hydrogels showed a high gel content, inverse thermoresponse and volume phase transition temperature (VPTT) with no respect to initial preparation. On the other hand, by altering the monomer/solvent ratio in the prepolymerisation mixture a large diversity in the microstructure, swelling capacity and VPTT was obtained.

Evaluation of In Vitro Cytotoxicity of Heat-cure Denture Base Resin Processed with a Dual-reactive Cycloaliphatic Monomer

The aim of this study is to evaluate cytotoxicity of tricyclodecane dimethanol diacrylate (TCDDMDA) when added to conventional heat-cure methyl methacrylate (MMA) monomer at 10% and 20% (v/v) concentrations. Twenty seven disk-shaped processed specimens were divided into control group (n = 9; comprises specimens made without substituting TCDDMDA in MMA) and two experimental groups (n = 9 each; specimens prepared by substituting TCDDMDA in MMA at 10% and 20% (v/v) concentration). Eluates were prepared by placing three specimens of each group into 9 mL of culture medium and then incubated at 37ºC for 24 hours. Continuous cells lines of L929 mouse fibroblast cells were used and MTT assay was employed to assess cytotoxicity. One-way analysis of variance (ANOVA) with post hoc Tukey's honestly significant difference (HSD) test was used to compare the mean optical density (OD) values and cell viability among the groups. A statistically significant difference was obtained (p = 0.000) when the mean and standard deviation of OD and cell viability (%) of the groups were compared. Highest OD value and cell viability was obtained with E20 group followed by E10 group. Addition of TCDDMDA in MMA of heat-cure denture base resin has no cytotoxic effect on L929 mouse fibroblasts. Dual-reactive TCDDMDA is a crosslinking monomer which has no cytotoxic effects on mammalian cell cultures. Hence, incorporation of TCDDMDA to MMA can be extrapolated and projected for fabricating dentures without compromising biocompatibility. How to cite this article: Ranganthan A, Karthigeyan S, Murugesan SV, et al. Evaluation of In Vitro Cytotoxicity of Heat-cure Denture Base Resin Processed with a Dual-reactive Cycloaliphatic Monomer. J Contemp Dent Pract 2019;20(11):1279-1285.

Adsorbent of Noble Metals, Based on Copolymers of Divinyl Sulfide and 4-Vinylpyridine

Radical copolymerization of divinyl sulfide and 4-vinylpyridine was used to synthesize 3D copolymers having in their structure “pyridine” nitrogen atoms and sulfide sulfur. It was found that the copolymers have high sorption capacities reaching for Au(III), Ag(I), Pt(IV) and Pd(II) values of 1200, 340, 1040, and 520 mg g−1, respectively. The results obtained indicate that divinyl sulfide is promising as a cross-linking monomer in syntheses of ion-exchange resins.

Preparation of Creatinine Sensor Material By Molecularly Imprinted Method Using MBAA and AMPSA as Precursors

Synthesis and preparation of creatinine sensor material by molecularly imprinted method using N,N'-Methylenebisacrylamide (MBAA) and 2-Acrylamido-2-methyl-1-propanesulfonic acid (AMPSA) as precursors, on nylon membrane had been conducted. The precursor i.e. MBAA and AMPSA is used as cross-linker monomer, and functional monomer respectively, with the creatinine as template. The performance of creatinine sensor material been studied by instrument response (resistance) pattern analysis to concentration of creatinine. The result of FTIR spectra and SEM photograph, indicated the formation of molecularly imprinted polymer (MIP) on nylon membrane. Logarithmic pattern is appears as instrument response to concentration change of creatinine. Linear correlation of instrument response and creatinine concentration is observed at concentration ranges 1 to 5 ppm of creatinine. Comparative studies show that performance of nylon coated membrane is better than non-coated membrane. Linearity, limit detection, and limit quantification value of coated membrane is 0.9592; 1.2066 ppm; and 4.0221 ppm respectively. On the other hand for non-coated membrane, linearity, limit detection, and limit quantification value obtainedis 0.8799; 2.1607 ppm and 7.2044 ppm respectively.