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首页> 外文会议>International Conference on Deformation, Yield and Fracture of Polymers; 20000410-20040413; Cambridge; GB >The Mechanics of β and α Crystal Deformation in Annealed Isotactic Polypropylene
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The Mechanics of β and α Crystal Deformation in Annealed Isotactic Polypropylene

机译：退火等规聚丙烯中β和α晶体变形的力学

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摘要

The stress-strain responses of α-iPP and β-iPP are remarkably similar at low temperatures until very large deformations, at which β-iPP strain hardens more rapidly. The compression of β-iPP involves the dramatic transformation of β crystals to ? crystals and an overall drop in the crystallinity. This process is favored at high temperature. α-iPP deformation involves the reduction of α crystallinity however at high temperature strain induced crystallization of α may also be occuring. At 25℃ (111) planes were preferentially oriented normal to the compressive direction, but at high temperatures (040) planes are preferentially oriented instead, indicating a change in the relative slip system strengths. When α crystals are formed by the β → α transformation the alignment of α planes exhibits the same temperature dependence.
机译：α-iPP和β-iPP的应力-应变响应在低温下非常相似，直到出现非常大的变形为止，此时β-iPP应变会更快地硬化。 β-iPP的压缩涉及β晶体急剧转变为？结晶和整体结晶度下降。此过程在高温下是有利的。 α-iPP变形涉及α结晶度的降低，但是在高温下，应变诱导的α结晶也可能发生。在25℃（111）时，平面优先垂直于压缩方向，但在高温（040）时，平面则优先定向，这表明相对滑动系统强度发生了变化。当通过β→α转变形成α晶体时，α平面的排列表现出相同的温度依赖性。

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