The correlation between the lower temperature melting plateau endotherm and the stretching-induced pore formation in annealed polypropylene films
The correlation between the lower temperature melting plateau endotherm and the stretching-induced pore formation in annealed polypropylene films
复制标题
退火聚丙烯薄膜中低温熔融平台吸热与拉伸引起的孔形成之间的相关性
DOI：
10.1177/8756087911434186
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发表时间：
2012-01
期刊：
影响因子：
--
通讯作者：
Xu Yunqi
中科院分区：
文献类型：
--
作者：
Lei Caihong;Huang Weiliang;Xu Ruijie;Xu Yunqi
分析了聚丙烯硬弹性体薄膜的室温拉伸过程，研究了退火过程中产生的差示扫描量热曲线的低温吸热平台与拉伸诱导的气孔形成之间的关系。结果表明，与前驱体薄膜相比，退火后薄膜在13.0°和18.4°的2个θ角附近出现了吸热平台和一些衍射现象。在拉伸过程中，平台逐渐消失，这些衍射现象也消失了。同时，形成了连接片层的孔洞和桥梁。吸热平台来自于初始排核层片状结构周围的链条结晶。在孔隙形成阶段，生长的晶体首先被拉伸并转化为连接片层的桥梁。进一步伸展到应变硬化阶段导致了排核层片状组织的变形。实验结果表明，基于熔体拉伸机理的微孔膜制备过程中，吸热平台与成孔有直接关系。
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 2θ 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.
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