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1·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。

2·The transverse shear deformation as well as extensional strain in each lamina is included. Equations of equlibrium for laminae are first derived.

在计算各单层横向剪切变形影响时，采用单层中面法线变形后维持直线，但放弃层中面法线及其正交线之间变形后保持直角的假定。

3·By assuming a simple cubic arrangement of the aggregates, the small strain behavior of the junction rubber is analyzed in extensional mode.

假定聚集体为简单的立方体排列，以外延方式分析连接橡胶的小应变行为。

4·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。