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In this thesis, the modification of PVC/CPE blends was investigated. Addition of aromatic diamines into PVC/CPE blends as a coupling agent, greatly increases the impact strength of the blends. At the same time, other mechanical properties such as the tensile and bending strength can be improved as well. With the aid of solvent etching, the multiphase microstructure of the blends has been studied using a scanning electron microscope. The relationship between the microstructure and mechanical properties of the blends has been discussed. It was shown that there were coupling and crosslinking reactions in the blends with coupling agents. The concentration of the reacted coupling agent was related to the mechanical properties of the blends quantitatively. Using probability methods, the concentration of the coupled molecules formed in the blends can be calculated. The influence of the ratio of PVC to CPE on the coupling effectiveness can be predicted.
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Song et al. (1987) studied this question.
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