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。
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。
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