摘要
以聚乳酸(PLA)为基材,己二酸-对苯二甲酸-丁二醇酯共聚物(PBAT)为增韧剂,纳米SiO_2为增强剂,采用熔融共混法制备了PLA/PBAT/纳米SiO_2复合材料;研究了纳米SiO_2不同含量对复合材料力学性能、热性能和流变性能的影响。研究结果表明:随纳米SiO_2含量的增加,复合材料弯曲强度和拉伸强度均先增大后减小,其中,当纳米SiO_2质量为2份时,其力学性能最优,弯曲强度和拉伸强度分别提高了17.17%和14.67%;随纳米SiO_2含量的增加,复合材料初始分解温度和半寿温度分别升高5~8℃和8~10℃,玻璃化转变温度Tg和熔融温度Tm分别升高1~3℃和3~6℃,复合材料热稳定性提高;在3种不同温度(155,160,165℃)下,添加纳米SiO_2的复合材料剪切黏度比未添加纳米SiO_2的大,且二者剪切黏度之差随温度升高而减小,说明其分子间作用力随温度升高而减弱,复合材料可以在155~165℃下进行加工;复合材料为假塑性流体,且随温度升高流动指数n逐渐增大、稠度系数K逐渐减小,复合材料假塑性减弱,流动性改善。
PLA/PBAT/nano-SiO2 composites were prepared through melt blending by using PLA as the substrate,poly(butyleneadipate-co-terephthalate)(PBAT)as the toughening agent and nano-SiO2 as the reinforcing agent.The effects of different mass fractions of nano-SiO2 on the mechanical property,thermal property and rheological property of the composites were studied.The results showed that the bending strength and tensile strength of the composites increased first and then decreased with the increase of nano-SiO2 mass fraction.When the mass fraction of nano-SiO2 was 2%,the improvement in the mechanical properties of the composites was significant,with the bending strength and tensile strength increased by 17.17%and 14.67%respectively.With the increase of nano-SiO2 mass fraction,the initial decomposition temperature and half-life temperature of the composites increased by 5~8℃and 8~10℃,the glass transition temperature and melting temperature increased by 1~3℃and 3~6℃respectively,indicating enhancement of the thermal stability of the composites.Rheological properties test showed that the shear viscosites of the composites with nano-SiO2 were higher than that of the composites without nano-SiO2 at three different temperatures.The difference of the shear viscosity between the two composites decreased with the increase in temperature,indicating the weakening of the intermolecular force.The composite materials could be processed at 155~165℃.The composite melts were pseudo plastic fluid.With the increase in temperature,the flow index increased gradually and the consistency coefficient decreased gradually,indicating that the pseudoplasticity of the composite decreased and the flowability improved.
作者
刘文勇
刘圣恭
王志杰
周欣
戴炳丰
杨明明
曾广胜
LIU Wenyong;LIU Shenggong;WANG Zhijie;ZHOU Xin;DAI Bingfeng;YANG Mingming;ZENG Guangsheng(Key Laboratory of Advanced Packaging Materials and Technology of Hunan Province,Hunan University of Technology,Zhuzhou Hunan 412007,China)
出处
《包装学报》
2018年第3期34-41,共8页
Packaging Journal
基金
湖南省自然科学基金资助项目(2018JJ2088)
湖南省重点研发计划基金资助项目(2016SK2077)
湖南省教育厅创新平台开放基金资助项目(15k034)
关键词
聚乳酸
纳米SIO2
力学性能
热性能
流变性能
polylactic acid
nano-SiO2
mechanical property
thermal property
rheological property
