Microstructure and properties of polypropylene/glass fiber composites grafted with poly(pentaerythritol triacrylate) |
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| Authors: | Qinglan?Ni Email author" target="_blank">Xinsheng?ZhuEmail author Email author" target="_blank">Yaorong?WangEmail author Zhonghua?Liu |
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| Affiliation: | (1) Department of Materials Engineering, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, Jiangsu, 215123, China;(2) Division of Nonwoven Materials Engineering, Faculty of Textiles and Clothing Engineering, Soochow University, Suzhou, Jiangsu, 215021, China;(3) Huatong (Suzhou) Science and Technology Co. Ltd, Suzhou, Jiangsu, 215123, China; |
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| Abstract: | Isotactic polypropylene(PP)/glass fiber(GF) composites were modified by grafting polymerization of polyfunctional monomer,
pentaerythritol triacrylate (PETA), in the presence of 2,5-dimethyl-2,5-di(tert-butylperoxy) hexane peroxide (DDHP) via melt
extrusion. Fourier transform infrared spectroscopy (FTIR), melt strength test (MS), mechanical property test, differential
scanning calorimetry (DSC) and X-ray diffraction (XRD) were used to characterize the microstructure and properties of the
modified composites. The crystallization kinetics was investigated by Mo method while apparent activation energy of crystallization
of the composites was determined by Kissinger method. The FTIR results showed that the acrylic polymers were grafted onto
the polypropylene chains. The grafting made the melt strengths and the mechanical properties of the modified composites, and
the interfacial adhesion between PP and glass fiber all enhanced. High melting and crystallization temperatures, high crystallization
rate and large activation energy of crystallization were also obtained after grafting. In addition, the grafted acrylic polymers
recovered the depressed crystallization of polypropylene and restrained α-β transition in fatigue experiment. |
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