FOURIER-TRANSFORM RHEOLOGY STUDIES ON THE CRYSTALLIZATION OFISOTACTIC POLYPROPYLENE IN NON-LINEAR LARGE STRAIN OSCILLATION SHEAR FIELDS
非线性大应变振荡剪切流场中PP结晶行为的傅立叶转变流变学研究

The isothermal flow induced crystallization(FIC) of isotactic polypropylene(iPP) under large amplitude oscillation shear fields was studied by rotational rheometer.The sinusoidal-strain dynamic shear flow of different amplitudes was performed on the undercooling iPP melts.Experimental results showed that,in comparison with the case for a small amplitude oscillation,the storage modulus of the melt would increase within a short period when a large amplitude oscillation was performed on the melts.This fact is ...