聚乳酸/接枝改性天然橡胶的制备及性能表征  

Preparation and Characterization of Polylactide/Grafting Modified Natural Rubber

作　　者：张春梅[1] 翟天亮 刘海腾 谢黎 黄保连 罗勇悦[3] 

机构地区：[1]贵阳学院化学与材料工程学院,贵州贵阳550005 [2]贵州省建材产品质量监督检验院,贵州贵阳550000 [3]中国热带农业科学院农产品加工研究所,广东湛江524001

出　　处：《塑料科技》2018年第2期74-78,共5页Plastics Science and Technology

基　　金：贵州省普通高等学校科技拔尖人才支持技划(黔教合KY字[2016]089);贵州省科学技术基金项目(黔科合J字[2015]2006号);国家自然科学基金项目(51703038)

摘　　要：通过乳液聚合法制备了甲基丙烯酸缩水甘油酯接枝改性天然橡胶（NR-g-GMA）,并用傅里叶变换红外光谱仪确认了NR-g-GMA的化学结构。用哈克密炼机熔融共混制备了聚乳酸（PLA）/NR-g-GMA共混物,研究了NR-g-GMA用量对共混物的微观形貌、热性能和力学性能的影响。结果表明：共混物中的NR-g-GMA以球粒分散相分布在PLA基体中,并随NR-g-GMA用量的增加,分散相尺寸增大;NR-g-GMA的引入使PLA的玻璃化转变温度和结晶温度降低,熔融温度和结晶度提高,共混物的热稳定性有所降低;PLA/NR-g-GMA共混物的断裂伸长率随NR-g-GMA用量的增加显著提高,纯PLA的断裂伸长率为4%,当NR-g-GMA用量为10%时,共混物的断裂伸长率达到85%,表明NR-g-GMA对PLA具有显著的增韧作用。The natural rubber grafted with glycidyl methacrylate（NR-g-GMA） was prepared by emulsion polymerization. The chemical structure of NR-g-GMA was confirmed by Fourier transform infrared（FTIR） spectroscopy. PLA/NR-g-GMA blends were prepared by a Haake internal melt mixer. The morphological, thermal and mechanical properties of the blends were investigated as a function of NR-g-GMA content. The results show that the dispersed phase of NR-g-GMA in the blends is distributed in the PLA matrix, and the size of the dispersed phase increases with the increase of the amount of NR-g-GMA. The introduction of NR-g-GMA reduces the glass transition temperature and crystallization temperature of PLA, increases the melting temperature and crystallinity, and reduces the thermal stability of the blends. The elongation at break of PLA/NR-g-GMA blends increases significantly with the increase of NR-g-GMA content. The elongation at break of pure PLA is 4%. When the NR-g-GMA dosage is 10%, the elongation at break of the blends reaches to 85%, indicating that NR-g-GMA has a significant toughening effect on PLA.

关 键 词：聚乳酸 天然橡胶 接枝改性 熔融共混 增韧 

分 类 号：TQ323.41[化学工程—合成树脂塑料工业]