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Pultrusion curing behavior of vinyl ester resin and curing reaction kinetics

Author: LiJianGuo
Tutor: YangXiaoPing
School: Beijing University of Chemical Technology
Course: Polymer Chemistry and Physics
Keywords: Vinyl ester resin Pultrusion Curing reaction Curing Kinetics Carbon fiber composite materials Vera squeeze
CLC: TQ320
Type: Master's thesis
Year: 2003
Downloads: 285
Quote: 6
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Abstract


Curing behavior of the resin system and curing kinetics of production and processing of materials theoretical guidance. This thesis mainly through DSC, DMTA, FTIR, mechanical testing and other methods studied pultrusion HETRON 922 vinyl ester resin curing agents in different crosslinking under the system behavior, analyzes the type and amount of curing agent for the resin and curing behavior its performance, determine its curing reaction kinetic parameters and optimal curing agent systems and curing process optimum conditions for the pultrusion process parameters determine the overall lay the foundation for preparing a vinyl ester resin pultruded composite materials, and the mechanical performance test and analysis. By differential scanning calorimetry (DSC) analysis of the type and amount of curing agent curing reaction heat of the resin, and found that different reactive peroxide curing agent combination with the synergistic effect, the curing reaction temperature is moderate, the resin cure exotherm increases, the curing reaction is more fully; then by infrared spectroscopy (FTIR) analysis of the resin curing agent in a different degree of cure under the system, that the use of different active agents in combination with the curing system in a relatively small amount of the active improve the degree of cure of the resin. By casting resin body static mechanical properties and dynamic mechanical thermal analysis studies, comprehensive evaluation of the resin cured curing reaction behavior on the performance impact that the different activities associated with the curing agent content of 1.0% in the same time improve the cured resin degree and expand the polymer network, the resin casting body with good mechanical properties and heat resistance. lt; WP = 4 gt; using non-isothermal DSC study of the vinyl ester resin system curing kinetics, with Kissinger equation, Ozawa equation and the equation obtained Crane curing reaction of the resin system the apparent activation energy and reaction order and calculated characteristic temperature of the resin curing. By isothermal DSC analysis at different temperatures experiences resin curing reaction kinetic model (autocatalytic kinetic model) was studied, as well as relationships and determined by a nonlinear least squares method for modeling the curing kinetics equation parameters , and the simulation results are compared with experimental results and considered as independent of each other autocatalytic model kinetic model better than the vinyl ester resin suitable for high temperature curing reaction of the experimental results. Confirmed by 1H NMR spectroscopy (NMR) of the resin obtained in the styrene monomer and a vinyl ester monomer double bond molar ratio of the double bond. Were then analyzed by FTIR isothermal resin of vinyl ester monomer, styrene monomer and resin carbon-carbon double bonds in general relationships and the relationship is obtained, and then analyzes the structure of the cured product of the resin composition and the curing mechanism of . Based on the above characteristics of vinyl ester resin curing and curing kinetics of research findings and previous work by our group, using production-scale preparation of carbon fiber pultrusion equipment / vinyl ester resin composite materials, and conducted mechanics, DMTA and SEM testing, focusing on analysis and comparison of different speeds pultruded composites before and after curing the mechanical properties and heat resistance, the effects of different post-curing pultrusion processing speed and performance of the composites.

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