摘要
采用甲基丙烯酸环氧丙酯与丙烯酸酯类单体共聚的环氧型丙烯酸酯橡胶(ACM)增韧聚乳酸(PLA)。冲击测试结果发现,随着ACM含量的增加,共混物冲击强度先增加后降低,增韧剂最佳的质量分数为25%,冲击强度可达到670J/m;拉伸性能测试表明,随着ACM含量增加,共混物的杨氏模量和屈服应力逐渐降低;ACM的玻璃化转变温度随着橡胶组分的增加逐渐上升,PLA相的玻璃化转变温度变化不明显;差示扫描量热(DSC)测得加入ACM后,PLA冷结晶温度降低;扫描电镜(SEM)发现橡胶粒子质量分数为10%时能均匀分散在PLA中,ACM含量增加,相区尺寸变大;形变区观察发现,ACM橡胶粒子发生空洞化,基体发生剪切屈服。
The copolymer of glycidyl methacrylate and acrylate monomer （ACM） was used to toughen polylactide （PLA）. The impact test result indicates that the impact strength of the blends increases first and then decreases with the ACM content increasing. When the mass faction of ACM is 25%, the impact strength reaches the maximum value of 670J/re. The tensile test shows that the Young＇s modulus and yielding stress of the blends decrease with the ACM content increasing. The glass transition temperature （Tg） of ACM increases with the ACM content and Tg of PLA changes little. DSC test indicates the cold crystallization temperature of PLA decreases with the addition of ACM. SEM shows that ACM disperses in the PLA matrix uniformly when the mass fraction of ACM is 10 %, and the phase domain size increases with the ACM content increasing. Deformation zone observed by SEM shows that the cavitation takes place for ACM and the shear yielding occurs for the PLA matrix.
出处
《高分子材料科学与工程》
EI
CAS
CSCD
北大核心
2013年第12期82-85,共4页
Polymer Materials Science & Engineering
基金
国家自然科学基金资助项目(51273025
50803007)
关键词
聚乳酸
丙烯酸酯橡胶
增韧
结构
性能
polylactide
acrylic rubber
toughening
structure
property
