聚乳酸/苎麻纤维(PLA/RF)复合材料的制备与性能

对苎麻纤维(RF)进行偶联剂处理和聚乳酸(PLA)/氯仿溶液浸润处理后,采用溶液浇铸法制备PLA/RF复合材料,并观察RF处理后的表面形态及PLA/RF的等温结晶情况.结果表明:RF能够有效提高PLA/RF复合材料的拉伸强度;3种偶联剂(KH5501,KH570,A151)在80,℃下处理的RF对PLA的增强效果较在室温下处理的增强效果好;RF经过浸润处理后吸水率下降;在RF的浸润液中添加增塑剂柠檬酸三丁酯(TBC)能够提高材料断裂伸长率;通过偏光显微镜(POM)观察到,在靠近RF附近位置PLA球晶较其他位置处细小;随着TBC质量分数的增加,PLA球晶尺寸增大.

Preparation and Properties of PLA/RF Composite Materials

After treating the ramie fiber(RF) by coupling agent and soakage processing,the poly(lactic acid)(PLA)/RF com-posite sheets were prepared by means of solvent casting process.The treated RF was observed on its surface by scanning electron microscope(SEM).The isothermal crystallization of PLA/RF was also observed by polarizing microscope(POM).The results show that the tensile strength of PLA/RF composite materials is enhanced by the reinforcement RF.When the coupling process is operated at 80,℃,the reinforcement effect of coupling treated RF on PLA composite is better than that at room temperature.The water absorption rate of RF declines after soakage processing.The elongation at break of PLA/RF composite is improved by adding tributyl citrate(TBC) in the soakage processing solution.It can be observed by POM that the spherocrystal dimension of PLA becomes bigger with the increasing TBC content,and the spherocrystal dimension of PLA around RF is smaller than that at other position.