JRUPS
Abstract : Application of Disordered Organic Semiconductor Theory to Low Temperature Curing of Epoxy Resins
Application of Disordered Organic Semiconductor Theory to Low Temperature Curing of Epoxy Resins DOI: http://dx.doi.org/10.6000/1929-5995.2014.03.01.1 |
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 |
Editor’s Choice | Journal of Research Updates in Polymer Science
The below articles have been selected by the Editor in Chief to be the top articles published in the journal. The topic, scientific quality and importance in the field where collectively considered while making this selection
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Volume 4, Number 4 | ||||||||||||
An Overview of Mechanical Tests for Polymeric Biomaterial Scaffolds Used in Tissue Engineering - Pages 168-178 Oscar Robles-Vazquez, Ignacio Orozco-Avila, Juan C. Sánchez-Díaz and Elena Hernandez DOI: http://dx.doi.org/10.6000/1929-5995.2015.04.04.1 Assembly of Ordered Polystyrene Nanoparticles on Self-Assembled Monolayers - Pages 202-209 |
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Volume 4, Number 3 | ||||||||||||
Synthesis and Characterization of Electrically Conducting Polyaniline Doped with Glacial Acetic Acid (CH3COOH) at Room Temperature - Pages 134-138 Omar Melad DOI: http://dx.doi.org/10.6000/1929-5995.2015.04.03.1 |
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Volume 4, Number 2 | ||||||||||||
5-Hydroxy-6-Methyluracil as a Polyvinyl Chloride Stabilizer - Pages 123-126 Kesavarao Sykam and Shailaja Donempudi DOI: http://dx.doi.org/10.6000/1929-5995.2015.04.02.5 |
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Volume 4, Number 1 | ||||||||||||
Effect of Cenosphere Fly Ash on the Thermal, Mechanical, and Morphological Properties of Rigid PVC Foam Composites - Pages 1-14 A Simple and Efficient Approach to Cellulose/Silica Composite Aerogel with High Silica Utilization Efficiency - Pages 56-61 |
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Volume 3, Number 4 | ||||||||||||
A Brief Overview on Ferrite (Fe3O4) Based Polymeric Nanocomposites: Recent Developments and Challenges - Pages 184-204 O.P. Bajpai, D.K. Setua and S. Chattopadhyay DOI: http://dx.doi.org/10.6000/1929-5995.2014.03.04.1 |
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Volume 3, Number 3 | ||||||||||||
Characterization of Phosphate Glass Reinforced Gelatin Blend Bioactive Composite Films - Pages 149-156 Kamol Dey, Poonam Alamgir, Shahnaz Parvin, Gulshana Mohol, Wafa Tonny, Mubarak A. Khan and Ruhul A. Khan DOI: http://dx.doi.org/10.6000/1929-5995.2014.03.03.2 |
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Volume 3, Number 2 | ||||||||||||
Mechanism of Micro-Crack Propagation in Semicrystalline Polymers - Pages 57-62 Theodor Stern DOI: http://dx.doi.org/10.6000/1929-5995.2014.03.02.1 Modification of Nanocrystalline Cellulose for Bioactive Loaded Films - Pages 122-135 Delamination and Separation of Aluminum-Polyethylene-Paper Packing Material - Pages 136-141 |
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Volume 3, Number 1 | ||||||||||||
Study on Flexural Strength and Flexural Failure Modes of Carbon Fiber/Epoxy Resin Composites - Pages10-15 Hongwei He and Kaixi Li DOI: http://dx.doi.org/10.6000/1929-5995.2014.03.01.2 Structurally Functionalized Polyurethane Foam for Elimination of Lead Ions from Drinking Water - Pages 16-25 Innovative Rice Seed Coating (Oryza Sativa) with Polymer Nanofibres and Microparticles Using the Electrospinning Method - Pages 33-39 |
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Volume 2, Number 2 | ||||||||||||
Organomodified Silicone Elastomer (OMSE) for Next Generation Personal Care Products - Pages 85-96 Ashish Anant Vaidya, K. Balu, Mohan Vijaykumar Chavan, Nilmoni Ghosh and Amit Kumar DOI: http://dx.doi.org/10.6000/1929-5995.2013.02.02.1 |
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Volume 2, Number 1 | ||||||||||||
Optimization of Process Parameters for Generation of Nanocellular Polymer Foams - Pages 48-56 Subhendu Bhattacharya, Rahul Gupta and Sati N. Bhattacharya DOI: http://dx.doi.org/10.6000/1929-5995.2013.02.01.6 |
Journal of Research Updates in Polymer Science | Volume 2 Number 4
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Bisphenol, Diethylstilbestrol, Polycarbonate and the Thermomechanical Properties of Epoxy–Silica Nanostructured Composites - Pages 183-193 Electromagnetic Modeling of Dielectric Mixtures - Pages 194-200 Mechanical Characterization of Epoxy Polymer Concrete Containing Fly Ash - Pages 201-208 Sol-Gel Process for Anti-Corrosion Coatings - Pages 209-231 Giesekus Constitutive Model for Thermoviscoelastic Fluids based on Ordered Rate Constitutive Theories - Pages 232-260
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Journal of Research Updates in Polymer Science | Volume 2 Number 3
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Formulation, Characterization, Study of Swelling Kinetics and Network Parameters of Poly (MA-co-VA-co-AA) Terpolymeric Hydrogels with Various Concentrations of Acrylic Acid - Pages 142-152 Can Bio-Based Thermoset Polymers Replace Petrochemical Based Counterparts? - Pages 153-154 Modification and Characterization of Biodegradable Chitosan/ Starch-Based Films with Monomer 1,4-Butanediol Diacrylate (BDDA) by Gamma Radiation - Pages 155-167 Three-Dimensional Simulation of the Shrinkage Behavior of Injection-Molded Poly Lactic Acid (PLA): Effects of Temperature, Shear Rate and Part Thickness - Pages 168-173 Computational Simulation of the Random Depolymerization of Linear Polymers Obtained by Step-Polymerization of AB-type Monomers - Pages 174-182 |