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研究了两种典型的低温抗冲共聚聚丙烯 (ICPP)的应力应变行为及温度依赖性 ,其低温应力应变行为揭示ICPP具有优异的低温抗冲性能和综合力学性能的结构本质 .从初始弹性模量、屈服应力及断裂伸长随温度变化所显示的变化规律进一步确认了两种ICPP的序列结构特征和相结构特征 .断裂伸长变化显示了乙丙橡胶相的增韧作用 ,屈服应力变化显示了分散相对基质结合紧密程度的影响 ,弹性模量则与基质的结晶状况和结晶形态有着比较密切的关系 ,同时也与乙丙橡胶相和聚丙烯基质的玻璃化转变温度密切相关
The stress-strain behavior and temperature dependence of two typical low-temperature impact copolymer polypropylene (ICPP) were investigated. The low-temperature stress-strain behavior of ICPP revealed that ICPP possesses excellent low-temperature impact resistance and structural properties of comprehensive mechanical properties.From the initial elastic modulus The results show that the change of elongation at break shows the toughening effect of ethylene-propylene rubber (PP) phase and the change of yield stress The effect of dispersion on the bond strength of the matrix is closely related to the crystalline and crystalline morphology of the matrix and to the glass transition temperature of the ethylene-propylene rubber and polypropylene matrix