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• W1994590577 abstract "Volumetric and thermal properties of cross-linked epoxy systems consisting of diglycidyl ether of bisphenol A (DGEBA) and poly(oxypropylene) (POP) diamines of four different lengths ranging from 3 to 68 units were investigated by molecular dynamics (MD) simulations. The cross-linked structures were built by using the simulated annealing polymerization approach. The density, coefficients of volume thermal expansion and glass transition temperature (Tg) of each of the four cross-linked epoxy systems were obtained from their volume–temperature behavior. The density obtained in the simulations agreed well with the experimental value, whereas the coefficients of volume thermal expansion were at least 30% lower than their corresponding experimental results. The predicted Tg values were higher than the experimental values due to the considerably faster cooling rates that are used in the simulations. It was observed that an increase in the chain length of the cross-linker POP-diamines led to a larger difference between the predicted and experimental values of Tg. Three different approaches were used to estimate the expected shift in the experimental Tg to higher values had these measurements been made at cooling rates comparable to those used in MD simulations. It is shown that, in general, the Tg values obtained in MD simulations are consistent with such shifted Tg values that account for the difference in the cooling rates, although no one particular shift approach worked well for all four epoxy systems studied." @default.
• W1994590577 created "2016-06-24" @default.
• W1994590577 creator A5057719786 @default.
• W1994590577 creator A5063126552 @default.
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• W1994590577 date "2012-02-01" @default.
• W1994590577 modified "2023-09-30" @default.
• W1994590577 title "Effect of cross-linker length on the thermal and volumetric properties of cross-linked epoxy networks: A molecular simulation study" @default.
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• W1994590577 doi "https://doi.org/10.1016/j.polymer.2011.12.051" @default.
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