Micromorphology and Miscibility of Dynamically Vulcanized TPV under Vibration Force Field

Abstract

Micromorphology and miscibility of thermoplastic vulcanized rubber (TPV) processed in the experimental equipment of vibrational induction for dynamic vulcanization are analyzed using SEM and FTIR. Experimental and theoretical results show that interpenetration and entanglement of macromolecular chains in TPV under vibration force field allow the formation of a thermoplastic interpenetrating network structure. In addition, the interfacial area of two-phase interpenetrating action increases and two-phase interface becomes less pronounced, which makes two-phase miscibility increase. With the increasing of vibrational frequency or amplitude, dispersed phase dimension decreases, the rubber phase becomes finer, and the flow resistance and dispersibility of rubber particles into the plastic matrix improves. Steady and dynamic samples are of similar molecular structure and the influence of steady and dynamic states on the type and relative number of feature absorption groups is not obvious. Dynamically processed samples are of better miscibility. Through reasonable selection of vibrational parameters, processing control of dynamic vulcanization, mixing dispersion, and reactant performance can be realized, and TPV with good comprehensive properties can be obtained.