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The temperature‐dependence of some mechanical properties of a cured epoxy resin system
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In this paper, the tensile mechanical properties and fracture toughness of a Bisphenol-A type difunctional epoxy resin, cured with different amounts of metaphenylene diamine, using two cure cycles, were determined over a range of temperature.Abstract:
The tensile mechanical properties and fracture toughness of a Bisphenol-A type difunctional epoxy resin, cured with different amounts of metaphenylene diamine, using two cure cycles, were determined over a range of temperature. The tensile modulus in the glassy state was seen to be predominantly related to intermolecular packing, while in the rubbery state crosslink density was the important factor. Yielding appeared to be due to an increase in free volume as a result of dilatation during the tensile test and was related to a critical shear stress. The large strain properties like tensile strength, elongation-to-break, and toughness showed a more complex dependence on chemical structure, molecular architecture, intermolecular packing, and crosslink density. The roles played by the relaxation processes in determining mechanical properties are highlighted.read more
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Highly Cross-linked Epoxy Coating for Barring Organophosphate Chemical Warfare Agent Permeation
Guoqing Wu,Dongjiu Zhang,Wei-Qin Xu,Hongjun Zhang,Li-Kun Chen,Yongchao Zheng,Yi Xin,Hong Cheng Li,Yan Cui +8 more
TL;DR: In this paper , the effects of the polymer coating structure, including cross-link density, chemical composition and free volume, on the chemical resistance to dimethyl methylphosphonate (DMMP, Soman simulant) were investigated in detail.
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Food-contact epoxy resin: co-variation between migration and degree of cross-linking. II Part A Chemistry, analysis, control, exposure & risk assessment
TL;DR: The degree of cross-linking increased with curing temperature, as indicated by the increase in glass transition temperature, the decrease in residual reaction exotherms and increased stability of the rubber storage modulus E'rub (increase in cross-link nodes), the fall in relaxation enthalpies and the decreased amplitude of the loss-factor, tan delta (reduction in chain mobility).
Journal ArticleDOI
Thermal Properties of Polymer Floor Coating with Alternative Granite Powder Filler
TL;DR: In this article , the results of the thermal analysis of epoxy resin coating and waste granite powder as an alternative filler to quartz sand were presented, showing that adding granite powder to epoxy resins does not change glass transition temperature.
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Journal ArticleDOI
Cross-Linking–Effect on Physical Properties of Polymers
TL;DR: In this article, a review of the properties of cross-linked polymers is presented from the practical viewpoint of an experimental scientist who is using cross-link polymers but who is not an expert on the theory of crosslinking.
Journal ArticleDOI
Differential scanning calorimetry of epoxy cure: isothermal cure kinetics☆
S. Sourour,Musa R. Kamal +1 more
TL;DR: In this article, the authors used a differential scanning calorimeter (DSC) under isothermal conditions in the range 50-150°C to collect and process rate and integral heat of reaction data during cure.
Journal ArticleDOI
Fracture toughness of an epoxy system
S. Mostovoy,E. J. Ripling +1 more
TL;DR: The fracture toughness of epoxy used in the bulk and adhesive form was measured by a previously developed technique as mentioned in this paper, where the uniform double cantilever-beam specimen, which was described earlier, was modified to a tapered beam, which simplified the experimental procedure and calculations for obtaining toughness measurements.
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The free volume interpretation of the dependence of viscosities and viscoelastic relaxation times on concentration, pressure, and tensile strain
John D. Ferry,Robert A. Stratton +1 more
TL;DR: In this paper, the free volume interpretation of the dependence of relaxation times and viscosities on temperature can be extended to their dependence on concentration, pressure, and tensile strain, where the treatment is probably limited to conditions where the fractional free volume is not greater than 0.08.
Journal ArticleDOI
Hypothetical mechanism of crazing in glassy plastics
TL;DR: In this paper, the authors proposed a stress-activated devitrification of a small amount of material at the tip of a chance nick or flaw, to a softer rubbery state, and then cavitation of the softened material is then assumed to take place under the same dilatant stress responsible for its formation.