JRUPS
Journal of Research Updates in Polymer Science | Volume 3 Number 4
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A Brief Overview on Ferrite (Fe3O4) Based Polymeric Nanocomposites: Recent Developments and Challenges - Pages 184-204 Influence of Cobalt (II) Chloride Catalysed on the Thermal and Optical Characterization of PEO Based Solid Polymer Electrolytes - Pages 205-215 Titanium Complex Containing a Saligenin Ligand - New Universal Post-Metallocene Polymerization Catalyst: Copolymerization of Ethylene with Higher α-Olefins - Pages 216-226 Flame Retardant and Mechanical Properties of Modified Paper Using Inorganic Salts for Packaging Applications - Pages 227-236 |
Journal of Research Updates in Polymer Science | Volume 3 Number 3
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Structure of Crystallizable Polymer Solutions - Pages 142-148 Characterization of Phosphate Glass Reinforced Gelatin Blend Bioactive Composite Films - Pages 149-156 Copper Ion Doped Mullite Composite in Poly (vinylidene Fluoride) Matrix: Effect on Microstructure, Phase Behavior and Electrical Properties - Pages 157-169 Mechanical Recycling of PET Waste from Non-Woven Fabrics by Reactive Extrusion with Chain Extenders - Pages 170-177 Comparative Degradation of LDPE, HDPE and HMHDPE under Different Soil Conditions - Pages 178-183 |
Journal of Research Updates in Polymer Science | Volume 3 Number 1
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Study on Flexural Strength and Flexural Failure Modes of Carbon Fiber/Epoxy Resin Composites - Pages 10-15 Structurally Functionalized Polyurethane Foam for Elimination of Lead Ions from Drinking Water - Pages 16-25 Stick-Slip Transition Behaviour of Two High Density Polyethylene Melts on Capillary Rheometer - Pages 26-32
Upon Synthesis of Poly(N-isopropylacrylamide-co-2-dimethyl-aminoethyl methacrylate-co-itaconic acid) Copolymers as Matrix Ensuring Intramolecular Strategies for Further Coupling Applications - Pages 48-56 |
Journal of Research Updates in Polymer Science | Volume 3 Number 2
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Mechanism of Micro-Crack Propagation in Semicrystalline Polymers - Pages 57-62 Nanoencapsulation of Antitumor and Antituberculosis Drug Preparations with Biocompatible Polymers - Pages 63-85 Fabrication and Thermo-Mechanical Characterization of HEMA Treated UV Photo-Cured Biodegradable Chitosan Film - Pages 86-96 New Polymer Syntheses Part: 55#. Novel Conducting Arylidene Polymers and Copolymers Based on Methyl-Cyclohexanone Moiety - Pages 97-107 Fabrication of Hollow Microspheres Using Single Step Electrospraying Process - Pages 108-113 The Solid State 13C NMR Study of Gamma Radiation of Ethylene-Octene Copolymer - Pages 114-121 Modification of Nanocrystalline Cellulose for Bioactive Loaded Films - Pages 122-135 Delamination and Separation of Aluminum-Polyethylene-Paper Packing Material - Pages 136-141 |
Abstract : Application of Disordered Organic Semiconductor Theory to Low Temperature Curing of Epoxy Resins
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Abstract: The steep autocatalytic feature in a highly accurate DSC study of the heat rate from curing an epoxy resin with piperidine at 27.5 Deg C could not be explained using chemical kinetic power laws usually applied to curing epoxy resin products at higher temperatures. The theory of disordered conjugated organic semiconductors developed in the last decade has been applied to the observed heat rate data. Four heat rate sources have been identified to completely account for the experimental data. Two of the four sources generating 80% of the heat are consistent with mobility change of ion pairs indicating that the low temperature cure follows an organic semiconductor mechanism. It was shown that autocatalysis did not begin until about one fiftieth of the epoxy rings were opened (ignition). After ignition the heat rates of two propagation mechanisms grow exponentially. One charge transport mechanism generates a small heat rate but grows immediately after ignition due to an increase in ion pairs by the dopant (piperidine). The second mechanism appears later but becomes dominant, peaking at 50% completion, where the heat rate is about 50 times higher than the start of the first mechanism. The rate increase is attributed to localized energy sites that lower the LUMO level closer to the HOMO level of the monomer increasing the mobility (heat rate). Keywords: Epoxy resins, kinetics (polym), calorimetry, diffusion, organic semiconductors.Download Full Article |