紫外老化对长玻纤增强聚丙烯复合材料流变性能和非等温结晶动力学的影响

doi:10.11896/cldb.18120157

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Abstract In this paper, the long glass fiber reinforced polypropylene (LGFPP) composites were prepared by melt blending method. The effects of UV aging on the rheological properties, crystallization behaviors and non-isothermal crystallization kinetics of LGFPP composites with different aging times were investigated using rheological testing (DRA) and differential scanning calorimetry (DSC). The results show that during UV aging, PP resin is degraded by oxidation which leads to reinforcement of the transition layer and the decrease of interfacial properties between fiber and matrix deteriorates. As a result, storage modulus, loss modulus and complex viscosity of the composites decreases, and the loss factor increases; T_o and T_c of the composites show an upward trend with aging time and the X_c reaches a maximum value of 38.2% after 400 h aging; the small molecules produced during UV aging can act as nucleating agents to accelerate the crystallization of PP, then t_1/2 declines. At the same time, The Avrami exponent n decreases obviously after aging and the crystal growth mode is dominated by three-dimensional spherulites.

Key words： UV aging long glass fiber polypropylene rheology crystallization kinetics

Published: 29 May 2020

CLC number:

TQ325.14

Fund:This work was financially supported by Science and Technology Project of Guizhou Province, China (2017/2304,2020/2Y009, 2017/4760), Guizhou Pro-vince High-level Innovative Talents Training Project (2016/5667, 2017/5623), and Science and Technology Funds of Baiyun District of Guiyang City (2018/3, 2018/10).

About author:: Ying Zhou received his M E. degree in mineral processing from the School of Mining, Guizhou University in June 2013. He is a research assistant currently pursuing flame-retardant of polymer working at National Engineering Research Center for Compounding and Modification of Polymer Materials. His research has focused on structure and performance of composite mate-rials.
Jianbing Guo, researcher of National Composite Mo-dified Polymer Materials Engineering Technology Research Center Deputy Director of Achievement Transformation and Technical Service Center. In July 2004, he graduated from the Chemical Engineering College of Qiqihar University. In June 2007, he obtained a master's degree from the School of Materials and Metallurgy, Guizhou University. He was awarded the subsidy of the Guizhou Provincial People's Government and was selected into the “Hundred Talents Program” project in Guizhou Province. He was awarded the second prize of the Science and Technology Progress Award of Guizhou Province and the second prize of 2, and engaged in the research on the structure and performance of composite materials. In recent years, he has published dozens of papers in the field of composite structure and properties.

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Cite this article:

ZHOU Ying,GUO Jianbing,HE Weidi, et al. Effect of Ultraviolet Aging on Rheological Properties and Non-isothermal Crystallization Kinetics of LGFPP Composites[J]. Materials Reports, 2020, 34(12): 12146-12151.

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http://www.mater-rep.com/EN/10.11896/cldb.18120157 OR http://www.mater-rep.com/EN/Y2020/V34/I12/12146

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