Relationship Between Crystal Orientation and Stress-induced Crystalline Melting of Syndiotactic Polypropylene Under Uniaxial Deformation via in situ Wide-angle X-ray Scattering

doi:10.7503/cjcu20120523

Chem. J. Chinese Universities ›› 2013, Vol. 34 ›› Issue (2): 485.doi: 10.7503/cjcu20120523

• Polymer Chemistry • Previous Articles

Relationship Between Crystal Orientation and Stress-induced Crystalline Melting of Syndiotactic Polypropylene Under Uniaxial Deformation via in situ Wide-angle X-ray Scattering

SHAO Chun-Guang¹, ZHUO Ran-Ran², LI Qian¹, CAO Wei¹, ZHANG Yang¹, ZHANG Rui-Jing¹, LIU Cheng-Gang¹, SHEN Chang-Yu¹

1. Nation Engineering Research Center for Advanced Polymer Processing Technology, School of Mechanics and Engineering Science, Zhengzhou University, Zhengzhou 450002, China;
2. Physical Engineering College, Zhengzhou University, Zhengzhou 450001, China

Received:2012-05-29 Online:2013-02-10 Published:2013-01-21

Abstract

Abstract:

Melt of syndiotactic polypropylene(sPP) was quenched to liquid nitrogen and held for 5 min, then the quenched samples were put into vacuum oven at 20, 40, 80, 120 ℃ for 10 h to prepare samples with different lamellar thicknesses. Relationship between crystal orientation and stress-induced crystalline melting under uniaxial stretching was studied with the combination of micro-tensile tester and in-situ wide angle X-ray diffraction(WAXD) measurement. Based on these results, "stress-induced melting" always occurs simulta-neously with crystal orientation in spite of different lamellar thicknesses. Critical stress for stress-induced melting illustrated a linear correlation vs. lamellar thicknesses. Furthermore, with the increase of lamellar thickness, the mechanical properties of sPP samples, such as elastic modulus, yield stress and modulus of strain harden changed obviously.

Key words: In situ X-ray diffraction, Syndiotactic polypropylene, Crystal orientation, Stress-induced melting, Lamellar thickness

CLC Number:

O631

TrendMD:

SHAO Chun-Guang, ZHUO Ran-Ran, LI Qian, CAO Wei, ZHANG Yang, ZHANG Rui-Jing, LIU Cheng-Gang, SHEN Chang-Yu. Relationship Between Crystal Orientation and Stress-induced Crystalline Melting of Syndiotactic Polypropylene Under Uniaxial Deformation via in situ Wide-angle X-ray Scattering[J]. Chem. J. Chinese Universities, 2013, 34(2): 485.

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Relationship Between Crystal Orientation and Stress-induced Crystalline Melting of Syndiotactic Polypropylene Under Uniaxial Deformation via in situ Wide-angle X-ray Scattering

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