摘要
采用熔融共混和模压成型工艺制备了乙烯-1-辛烯共聚物(EOC)增韧聚乳酸(PLA)共混物,考察了EOC的含量对共混物微观形貌、力学性能和热性能的影响。结果表明:虽然马来酸酐(MAH)的原位增容能够在一定程度上改善EOC与PLA的界面相容性,但效果不佳,两者的界面结合较弱;随着EOC含量提高,EOC/PLA共混物的拉伸强度和弹性模量逐渐下降,而断裂伸长率和冲击韧性先增大再降低,并分别在EOC的质量分数为10%和20%时达到最大值;EOC与PLA的共混没有改变PLA相的热分解特性,但使EOC相的起始分解温度和最大分解温度向高温区偏移。
The blends of polylactic acid （PI.A） toughened by ethylene-1-octene copolymer （EOC） were prepared via molten blending and compress molding. The effects of the mass fraction of EOC on the morphology, mechanical and thermal properties were investigated. The results show that there was a little improvement in the interfacial compatibility between EOC and PLA with the in situ compatilization of maleic anhydride （MAH）, exhibiting relative poor interfacial bonding. With the increment of EOC, the tensile strength and elastic modulus of EOC/PLA blends constantly decreased while the elongation at break and impact toughness increased and then declined,and their maximum values were obtained at 10wt. % and 20wt. % of EOC, respectively. There was no obvious variation on the thermal degradation of PLA phase after the blending of EOC and PLA, however a shifting of onset and maximum decomposition temperatures of EOC phase to high temperature zone was observed.
出处
《机械工程材料》
CAS
CSCD
北大核心
2013年第12期50-53,共4页
Materials For Mechanical Engineering
基金
安徽高校省级自然科学研究项目(KJ2013Z067)
安徽省教育厅博士生企业行科研基金资助项目
安徽理工大学人才引进基金资助项目(2010-11060)
关键词
聚乳酸
乙烯-1-辛烯共聚物
界面相容性
力学性能
热稳定性
poly lactic acid （PLA）
ethylene-l-octene copolymer （EOC）
interfacial compatibility
mechanical property
thermal stability
