MICROVOID FORMATION PROCESS DURING THE PLASTIC-DEFORMATION OF BETA-FORM POLYPROPYLENE
MICROVOID FORMATION PROCESS DURING THE PLASTIC-DEFORMATION OF BETA-FORM POLYPROPYLENE
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DOI：
10.1016/0032-3861(94)90906-7
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发表时间：
1994-01-01
期刊：
影响因子：
4.6
通讯作者：
KIMURA, Y
中科院分区：
文献类型：
--
作者：
CHU, F;YAMAOKA, T;KIMURA, Y
研究了不同结晶温度和拉伸温度下β晶聚丙烯（PP）塑性变形过程中微孔的形成过程。结果表明，随着结晶温度的升高和拉伸温度的降低，多孔陶瓷的孔隙率均增大。这一事实可以从原始膜的β晶体的稳定性方面来理解。在较高的结晶温度下形成的更稳定的β晶体具有较低的分子链流动性，从而阻碍了膜的体积收缩，而同时由膜内的β-α或β-近晶转变引起的体积收缩扩大了端部或微纤维之间的微孔。
The microvoid formation process that takes place during the plastic deformation of beta-form polypropylene (PP) was investigated at different crystallization and drawing temperatures. It was found that the porosity increased with both a higher crystallization temperature and a lower drawing temperature. This fact could be understood in terms of the stability of the beta crystals of the original film. The more stable beta crystals that formed at a higher crystallization temperature had a lower molecular chain mobility and thus hindered the bulk contraction of the film, while at the same time the volume contraction caused by either a beta-alpha or a beta-smectic transformation inside the film enlarged the microvoids at the end, or between the microfibrils.