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Enhanced β-crystal formation of isotactic polypropylene under the combined effects of acid-corroded glass fiber and preshear

Authors :
Guoqiang Zheng
Hongli Liu
Kun Dai
Changyu Shen
Mancun Xie
Baobao Chang
Chuntai Liu
Jingbo Chen
Source :
Polymer Composites. 34:1250-1260
Publication Year :
2013
Publisher :
Wiley, 2013.

Abstract

The acid-corroded glass fiber (GF)/isotactic polypropylene (iPP) composite was injection molded by mixing–injection molding (MIM). Through this method, preshear can be imposed on melt during mix–plasticization process. The crystalline structure across the thickness direction of the injection-molded bars was investigated by wide-angle X-ray diffraction and differential scanning calorimetry (DSC). It was unexpectedly found that, in core region, the acid-corroded GF/iPP sample has the highest content of β-form crystals, followed by uncorroded GF/iPP and neat iPP. Additionally, the crystalline morphology was investigated by polarized optical microscopy (POM) and scanning electron microscopy, and the results showed that β-transcrystallization is preferably present in the acid-corroded GF/iPP system. Confirmed by POM and DSC, the acid-corroded GF shows strong β-nucleation ability to iPP under static condition. Combined with the main features of MIM, three β-nucleation origins in the acid-corroded GF/iPP system under injection molding condition are proposed: (1) precursors induced by preshear in the barrel, (2) row-nuclei induced by local shear, and (3) the acid-corroded GF nuclei. POLYM. COMPOS. 34:1250–1260, 2013. © 2013 Society of Plastics Engineers

Details

ISSN :
02728397
Volume :
34
Database :
OpenAIRE
Journal :
Polymer Composites
Accession number :
edsair.doi...........bc3c29beb1666b1cbcca6d4f7b69bfa8
Full Text :
https://doi.org/10.1002/pc.22535