摘要
将聚乳酸(PLA)与聚对苯二甲酸/己二酸/丁二酯(PBAT)以60/40的质量比熔融共混挤出,并添加反应型增容剂IGETABOND以增强2种聚合物间的界面结合能力。使用差示扫描量热仪(DSC)、热重分析(TGA)、拉伸和冲击测试及扫描电镜(SEM),分析了添加增容剂共混物的力学性能、热性能及相形态。结果表明,共混物的断裂伸长率和冲击强度均随增容剂含量增加而增加,均在添加9phr时达到最大值,分别约为未添加时的2倍和3倍;添加增容剂后,虽然共混物仍有2个玻璃化转变温度(Tg),但两者的Tg略微呈现出相互接近的趋势;同时扫描电镜照片显示,未添加增容剂时,两相间的界面层清晰可见,但随着增容剂的添加量增至7phr时,两相的界面层几乎完全融合。
1-Acetic ester base-3-methyl imidazolium tetrafluroborate （[AOEMIM] [ BF4 ]） with different mass fraction were melt-blended with polylactic acid （PLA） to get [ AOEMIM ] [ BF4 ]/ PLA blend. The effect of [AOEMIM] [BF4] on the stability of polylactic acid during melt processing was studied by analyzing the change of number average molecular weight. The degradation property of blend in phosphate buffer was studied by testing changes of mass loss rate, sticky molecular weight and solution pH value. And the acute toxicity of blend degradation liquid in mouse was tested. The results show that the number average molecular weight of PLA reduces by 16.7 % after melt processing, and the addition of [ AOEMIM ] [ BF4 ] makes the change decrease. At the early stage of degradation, the viscosity .average molecular weight of blend decreases rapidly and pH of degradation liquid drops from 7.4 to 3.0. The blend degradation rate in phosphate buffer was accelerated with the increasing of the amount of [AOEMIM] [BF4], and its degradation liquid has no obvious toxicity to mice.
出处
《高分子材料科学与工程》
EI
CAS
CSCD
北大核心
2014年第1期108-112,117,共6页
Polymer Materials Science & Engineering
基金
国家自然科学基金资助项目(51173005)
关键词
聚乳酸
聚对苯二甲酸
己二酸
丁二酯
熔融共混
相容性
poly（lactic acid）
poly （butylene adipate-co-terephthalate）
melt blending
compatibility
