Abstract
The liquid-liquid phase-separation(LLPS) and rheological behavior of isotactic polypropylene/ethylene-propylene rubber(iPP/EPR) blends prepared through different methods were studied through small angle laser light scattering(SALLS) and dynamic rheological measurement.The calculated apparent diffusion coefficient(Dapp) during early stage of LLPS and the time required by the same qmax shifting during late stage of LLPS were investigated.It is found that the phase separation rate of melt-blended iPP/EPR(m-iPP/EPR) is higher than that of the solution-blended samples(s-iPP/EPR).Moreover,the results obtained through the dynamic rheological tests indicate that the relaxation rate of m-iPP/EPR sample is faster than that of s-iPP/EPR.It is suggested that the different phase separation rates between m-iPP/EPR and s-iPP/EPR are ascribed to the motion ability of polymer chain.
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