Effect of Pre-Shear on Flow-Induced Crystallization of Branched Polypropylene

被引：2

作者：

Drabek, Jiri ^{[1
]}

Janchai, Khunanya ^{[2
]}

Kida, Takumitsu ^{[2
]}

Yamaguchi, Masayuki ^{[2
]}

Zatloukal, Martin ^{[1
]}

机构：

[1] Tomas Bata Univ Zlin, Fac Technol, Dept Polymer Engn, Vavreckova 5669, Zlin 76001, Czech Republic

[2] Japan Adv Inst Sci & Technol, I-1 Asahidai, Nomi, Ishikawa 9231292, Japan

来源：

NOVEL TRENDS IN RHEOLOGY IX | 2023年 / 2997卷

关键词：

ELECTRON-BEAM IRRADIATION; ISOTACTIC POLYPROPYLENE; RHEOLOGICAL PROPERTIES; MOLECULAR-ORIENTATION; LONG; SPECTROSCOPY; DEFORMATION; TRANSITION; BEHAVIOR; HISTORY;

D O I：

10.1063/5.0159515

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

In this work, the effect of pre-shearing time on the crystallization of long-chain branched polypropylene (LCB-PP) subjected to simultaneous cooling and shearing was investigated using a polarized optical microscope equipped with a parallel-plate shear device and a photodetector. Crystallinity and orientation were evaluated using small-angle X-ray scattering, wide-angle X-ray diffraction and Fourier-transform IR instrument. Increasing the pre-shear time was found to decrease crystallization temperature, crystallinity and orientation (reaching practically constant values at long preshear times), suggesting that increasing the pre-shear time causes the chain branches to be more aligned along the backbone, reducing their efficiency, the LCB-PP melt becomes less elastic and the flow-induced crystallization is minimized. This effect is significant because the crystallization temperature has decreased from 137.0 degrees C to 122.8 degrees C due to pre-shear with followed mixed shear and temperature induced crystallization compared to the crystallization temperature of 118.5 degrees C achieved at purely thermally induced crystallization conditions.

引用

页数：11

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