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以碳纤维(CF)作填料,制备了碳纤维/聚乳酸(CF/PLA)复合材料,CF的质量比(CF:PLA)为1%、3%、5%、10%、15%。研究了PLA及CF/PLA复合材料的结晶性能和流变特性。结果表明,质量比≤3wt%时,CF在基体中起到了异相成核的作用,提高了PLA的结晶性能,XRD衍射峰强度增强,CF/PLA复合材料结晶温度和结晶度分别提高到112.5℃和30.7%,流变特性与纯PLA相似。CFCF的质量比≥5%时,达到“渗流阈值”,黏度激增,限制了分子链段的自由运动,导致CF/PLA复合材料结晶性能下降。CF质量比为15%时,CF/PLA复合材料结晶温度降低至93.1℃,结晶度只有2.5%。
The carbon fiber / polylactic acid (CF / PLA) composite was prepared by using carbon fiber (CF) as filler. The mass ratio of CF to PLA was 1%, 3%, 5%, 10% and 15%. The crystallization and rheological properties of PLA and CF / PLA composites were studied. The results show that when the mass ratio is less than or equal to 3wt%, CF plays a heterogeneous nucleation role in the matrix and improves the crystallinity of PLA. The intensity of XRD diffraction peak increases and the crystallization temperature and crystallinity of CF / PLA composites increase to 112.5 ℃ and 30.7%, rheological properties and pure PLA similar. When the mass ratio of CFCF is ≥5%, the “percolation threshold” is reached and the viscosity increases sharply, which restricts the free movement of the molecular chain segment, resulting in the decrease of the crystallinity of the CF / PLA composite. When the mass ratio of CF is 15%, the crystallization temperature of CF / PLA composites decreases to 93.1 ℃ and the crystallinity is only 2.5%.