NDLI: Pore formation mechanism of β nucleated polypropylene stretched membranes

Content Provider	Royal Society of Chemistry (RSC)
Author	Cao, Ya Xiang, Ming Wu, Tong Yang, Feng Kang, Jian
Copyright Year	2014
Abstract	In this article, two β nucleated polypropylene (β-iPP) precursor films were prepared at crystallization temperatures (Tc) of 110 °C and 135 °C. The differential scanning calorimetry (DSC), wide-angle X-ray diffraction (WAXD) and scanning electron microscopy (SEM) results reveal that the two samples, which were composed of bundle-like lamellae, had similar crystallinity and particularly high contents of the β-crystal. However, they behaved differently when stretched at 25 °C and 90 °C. Based on the detailed characterization of morphological evolutions during stretching by 2D-WAXD and SEM measurements, a mechanism of pore formation in stretching β-iPP is presented. We found that the phase transformation of β-smectic and β–α are not the primary origin of pore formation in stretching β-iPP, instead, the micropores are directly initiated from the substantially weak interfaces between β-lamellae. Since the bundle-like β-lamella without fully developed spherulites is an asymmetric three dimensional structure, the lamellae at different angles to the tensile axis would lead to various deformational modes during stretching. Therefore, it is the polydispersity of β-lamellae in β-iPP that causes the poor pore size distribution in stretching β-iPP membrane.
Starting Page	36689
Ending Page	36701
Page Count	13
File Format	HTM / HTML PDF
ISSN	20462069
Volume Number	4
Issue Number	69
Journal	RSC Advances
DOI	10.1039/c4ra03589e
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	X-ray crystallography Dispersity Differential scanning calorimetry Polypropylene Scanning electron microscope
Content Type	Text
Resource Type	Article
Subject	Chemistry Chemical Engineering

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