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1·The PP with high grafting rate can improve the melt strength and the extensional viscosity of a PP system and the strain hardening.

接枝率高的PP，可提高PP体系的熔体强度和拉伸黏度及其应变硬化。

2·With increasing the molecular weight of PTT melt, the extensional strain rate affected significantly the extensional viscosity of melt.

熔体的相对分子质量越高，拉伸速率对熔体的拉伸粘度影响越大。