首页> 外文期刊>RSC Advances >Influence of lamellar structure on double yield behavior and pore size distribution in beta nucleated polypropylene stretched membranes
【24h】

Influence of lamellar structure on double yield behavior and pore size distribution in beta nucleated polypropylene stretched membranes

机译:层状结构对β形核聚丙烯拉伸膜的双屈服行为和孔径分布的影响

获取原文
获取原文并翻译 | 示例
           

摘要

In this article, five beta nucleated polypropylene (beta-iPP) precursor films were prepared through crystallization within the temperature window of 110-135 degrees C, and microporous membranes were fabricated by a successive biaxial stretching. Differential scanning calorimetry (DSC), wide-angle X-ray diffraction (WAXD) and scanning electron microscopy (SEM) showed that all the five beta-iPP precursors, which were composed of parallel-stacked lamellae without fully developed spherulite, had similar crystallinity and extremely high contents of beta-crystals. Thus, the influence of the lamellar structure on the stress-strain behavior of beta-iPP precursors and the performance of such films upon stretching can be investigated. We first discovered a peculiar double yield phenomenon in beta-iPP under tensile loading. Based on the detailed characterization of the morphological evolution during stretching, we found that a narrower beta-lamellar thickness distribution would result in the delayed occurrence of a second yield point under tensile loading and a more uniform pore size distribution in the microporous membranes prepared from beta-iPP.
机译:在本文中,通过在110-135摄氏度的温度范围内结晶制备了五种β核聚丙烯(β-iPP)前体薄膜,并通过连续双轴拉伸制备了微孔膜。差示扫描量热法(DSC),广角X射线衍射(WAXD)和扫描电子显微镜(SEM)表明,由平行堆叠的片晶组成而没有完全形成的球晶的所有五个β-iPP前体均具有相似的结晶度和极高含量的β晶体。因此,可以研究层状结构对β-iPP前体的应力应变行为的影响以及此类薄膜在拉伸时的性能。我们首先在拉伸载荷下发现了β-iPP特有的双屈服现象。根据拉伸过程中形态演变的详细特征,我们发现较窄的β层厚度分布会导致在拉伸载荷下第二屈服点的延迟出现,并且由β制备的微孔膜的孔径分布更均匀-iPP。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号