Kinetics of Formation and Evolution of PhaseStructure in Multipolymer: 1. The Applicationof Semilogarithmic Plot Method to Early Stageof Phase Dispersion

摘要

Kinetics of phase dispersion of binary blends of polypropylene and poly(cis-butadiene)rubber during the processing in a batch mixer was investigated by a back small-anglelaser scattering (BSALS) online system. It was found experimentally that the scatteringintensity I(q, t) followed an exponential growth with time during the early dispersionstage from 1 s to 65 s, while at t > 65 s, the slope levels off with time. A theory inwhich two critical parameters, W(q) and Dd, were calculated was proposed to describethe early stage of phase dispersion; the former parameter is defined as the rate ofdecreasing dispersed phase dimension, and the latter, evaluated from the slope of W(q)versus q2 plot, is the dispersion coefficient. W(q) remains constant with the incrementof dispersed phase. W(q) has a self-similarity with q for different compositions. Theslope