Effect of Ultraviolet Aging on Rheological Properties and Non-isothermal Crystallization Kinetics of LGFPP Composites
ZHOU Ying1,2, GUO Jianbing1,2, HE Weidi1,2, XU Dinghong1,2, WANG Meng3
1 National Engineering Research Center for Compounding and Modification of Polymer Materials, Guiyang 550058,China 2 College of Materials and Metallurgy, Guizhou University, Guiyang 550025, China 3 School of Materials Science and Engineering, South China University of Technology, Guangzhou 510641, China
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; To and Tc of the composites show an upward trend with aging time and the Xc 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 t1/2 declines. At the same time, The Avrami exponent n decreases obviously after aging and the crystal growth mode is dominated by three-dimensional spherulites.
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2020, Vol. 34 
