Wall Slip Effect on Shear-Induced Crystallization Behavior of Isotactic Polypropylene Containing 尾-Nucleating Agent

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• 作者：Baojing Luo ; Hongfei Li ; Yao Zhang ; Feifei Xue ; Peipei Guan ; Jing Zhao ; Chengbo Zhou ; Wenyang Zhang ; Jingqing Li ; Hong Huo ; Dean Shi ; Donghong Yu ; Shichun Jiang
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2014
• 出版时间：August 27, 2014
• 年：2014
• 卷：53
• 期：34
• 页码：13513-13521
• 全文大小：550K
• ISSN：1520-5045

文摘

Shearing is unavoidable during the polymer process, and isotactic polypropylene (iPP) is one of the most used commercial polymers. iPP mixed with 尾-nucleating agent TMB-5 was isothermally crystallized at 135 掳C from melts under various shear conditions and investigated via synchrotron radiation small-angle and wide-angle X-ray scattering (SAXS and WAXS) techniques with CCD detector. The shear-induced crystalline structure and the orientation of the samples were studied according to the obtained WAXS and SAXS patterns. The results showed that both the crystallinity of 伪-iPP and 尾-iPP are in direct proportion to the orientation degree rather than shear rate especially at high shear rate, which proves that wall slip should not be neglected when taking shear effect or rheological behavior into consideration.