聚合物的二次屈服现象  

Double Yielding in Polymer Materials

作　　者：潘吉林[1] 杨伟[1] 李忠明[1] 杨鸣波[1] 

机构地区：[1]四川大学高分子科学与工程学院高分子材料工程国家重点实验室,四川成都610065

出　　处：《中国塑料》2005年第9期20-27,共8页China Plastics

摘　　要：一些乙烯类半晶聚合物在一定温度和应变速率下有二次屈服特性,根据其结晶形态、结构,提出了熔融再结晶、晶块剪切与滑移及晶片再取向破碎等理论。同时,发现在具有特殊相形态结构的聚合物及聚合物共混物中有二次屈服现象,并提出了相应的机理。Some semicrystalline polymeric materials exhibit double yielding at certain temperatures and stretching rates. Some mechanisms were proposed to explain the phenomena of double yielding, including melting and recrystallization, slipping and shearing of crystal blocks, reorientation and destruction of lamellae. The double yielding was also found in some polymer blends with specific phase morphology, and the corresponding mechanism was suggested.

关 键 词：二次屈服 聚合物 共混物 机理 

分 类 号：O631.3[理学—高分子化学]