The correlation between the lower temperature melting plateau endotherm and the stretching-induced pore formation in annealed polypropylene films

被引:30
作者
Lei Caihong [1 ]
Huang Weiliang [1 ]
Xu Ruijie [1 ]
Xu Yunqi [1 ]
机构
[1] Guangdong Univ Technol, Fac Mat & Energy, Guangzhou 510006, Guangdong, Peoples R China
基金
美国国家科学基金会;
关键词
annealing; stretching; polypropylene hard elastomer; melt stretching mechanism; microporous membrane; MICROPOROUS MEMBRANE FORMATION; ISOTACTIC POLYPROPYLENE; CRYSTALLINE-STRUCTURE; CAST FILMS; MORPHOLOGY; ORIENTATION; VARIABLES;
D O I
10.1177/8756087911434186
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
The room temperature stretching process of annealed polypropylene hard elastomer films was analyzed and the relationship between the low-temperature endotherm plateau in the differential scanning calorimetry curves generated during annealing and the stretching-induced pore formation was studied. It was found that compared with that of precursor film, an endotherm plateau and some diffraction phenomena around 2 theta angles of 13.0 degrees and 18.4 degrees were observed after annealing. During stretching, the plateau disappeared progressively and these diffraction phenomena also vanished. At the same time, the pores and bridges connecting lamellae were formed. The endotherm plateau came from the crystallization of tie chains around initial row-nucleated lamellar structures. During pore creation stage, the grown crystals were first drawn and converted to bridges connecting lamellae. Further stretching into the strain-hardening stage led to the deformation of the row-nucleated lamellar structures. The experimental results indicated that there was a direct relationship between the endotherm plateau and pore formation during the fabrication of microporous membrane based on melt stretching mechanism.
引用
收藏
页码:151 / 164
页数:14
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