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《Acta Materiae Compositae Sinica》 2018-06
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Crystallization and rheological properties of carbon fiber/poly(lactic acid) composites

LEI Yanzhou;WANG Shaowei;LV Qinniu;LI Zhenzhong;Department of Materials Engineering,Taiyuan Institute of Technology;  
Carbon fiber/poly(lactic acid)(CF/PLA)composites were prepared by using CF as filler.The mass ratio of CF(CF∶PLA)were 1%,3%,5%,10% and 15%.Crystallinity and rheological properties of PLA and CF/PLA composites were investigated.The results show that,CF/PLA composites with 1% and 3% CF can improve the overall crystallinity of PLA at cooling process due to the heterogeneous nucleation mechanism.The intensity of XRD diffraction peaks gets stronger.The crystallization temperature and crystallinity respectively of CF/PLA composites increase to 112.5℃ and 30.7%.And the rheological properties are similar to those of pure PLA.When the mass ratio of CF increases to 5%,which is the"percolation threshold",the viscosity of CF/PLA composites gets a sharp rise.The movements of molecular segments are limited,leading a decrease in crystallinity of PLA.When the mass ratio of CF is 15%,the crystallization temperature of CF/PLA composites reduces to 93.1℃ and the crystallinity is only 2.5%.
【Fund】: 太原工业学院青年科学基金(2016LQ12);太原工业学院大学生创新创业训练项目(GK20170097)
【CateGory Index】: TB332
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