摘要
通过熔融反应挤出法制备聚乳酸接枝甲基丙烯酸缩水甘油酯(PLA-g-GMA)用于增容聚乳酸/杨木粉(PLA/WF)复合材料;通过核磁共振氢谱和红外光谱对PLA-g-GMA的结构进行了分析,通过力学性能测试、扫描电镜和动态热机械分析对复合材料进行了表征。结果表明,随着增容剂含量的增加,复合材料的拉伸强度和弯曲强度逐渐提高,相比未增容材料的强度最大可分别提高31%和21%;扫描电镜结果显示PLA-g-GMA能增强PLA与WF的界面相互作用,复合材料拉伸断面的空洞和间隙逐渐减少。动态力学分析结果显示随着PLA-g-GMA用量的增加,材料中PLA相的玻璃化转变温度呈下降的趋势。
Poly( lactic acid)-graft-glycidyl methacrylate( PLA-g-GMA) prepared by melt blending was used to compatibilize poly( lactic acid) / wood flour( PLA / WF) composites. The structure of PLA-g-GMA was investigated by1 Hnuclear magnetic resonance(1H-NMR) and Fourier transform infrared spectroscopy( FT-IR),and the composites were characterized by mechanical testing,scanning electron microscope( SEM) and dynamic mechanical analysis( DMA).The results show that with increasing the PLA-g-GMA content,the tensile strength and flexural strength increase by 31%and 21% respectively compared to composites without PLA-g-GMA. Micromorphologic investigation reveals the interfacial adhesion between PLA and WF phase is improved by the introduction of PLA-g-GMA,and cavities and gaps on tensile fracture surface are diminished gradually. The results of DMA analysis reveal that the glass transition temperature of PLA phase in composites trends to decrease with increasing the content of PLA-g-GMA.
出处
《高分子材料科学与工程》
EI
CAS
CSCD
北大核心
2015年第5期125-128,134,共5页
Polymer Materials Science & Engineering
基金
国家级林业科技成果推广项目([2012]19号)
关键词
聚乳酸
甲基丙烯酸缩水甘油酯
反应挤出
相容性
poly(lactic acid),glycidyl methacrylate,reactive extrusion,compatibility
