Authors Vijayan , P. ; Pionteck, J. ; Thomas, S.
Title Volume shrinkage and cure kinetics in carboxyl-terminated poly(butadiene-co-acrylonitrile) (CTBN) modified epoxy/clay nanocomposites
Date 04.05.2015
Number 47142
Abstract The role of carboxyl-terminated poly(butadiene-co-acrylonitrile) (CTBN) liquid rubber and reactive surfactant modified nanoclay on the volume shrinkage during cure reaction and cure kinetics of epoxy/anhydride system in the presence of a catalyst was studied using Pressure-Volume-Temperature (PVT) measurements and real time FTIR spectroscopic analysis, respectively. The dilution effect of CTBN and catalytic effect of clay modifier on the epoxy/anhydride reaction reflected in the volume shrinkage behavior of CTBN modified epoxy/clay nanocomposites (epoxy/clay/CTBN hybrid) during cure. The kinetics of cure was studied based on the conversions derived from PVT data assuming a linear relation between network formation and volume shrinkage. The consumption of epoxy band (913cm(-1)) during cure obtained from the real time FTIR spectroscopic analysis was employed to compare the effect of both CTBN and nanoclay on the cure kinetics. In epoxy/clay/CTBN hybrid, during the initial stage of cure the catalytic activity of the clay modifier controls the cure rate, and at the final stage the phase separated CTBN obstruct the diffusion of reactive sites to slows down the conversion rate. The Tg obtained from DSC analysis of the cured samples confirmed the observed shrinkage and cure behavior.
Publisher Journal of Macromolecular Science - A: Pure Applied Chemistry
Citation Journal of Macromolecular Science - A: Pure Applied Chemistry 52 (2015) 353-359
Tags nanocomposites volume shrinkage liquid rubber epoxy cure kinetics mechanical-properties ir spectroscopy liquid rubber resin cure temperature nanoclay morphology

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