摘要
以转矩流变仪为反应器,采用环氧类扩链剂对聚乳酸回收料进行熔融扩链改性研究。考察了扩链剂加入量、反应时间、反应温度对扩链反应的影响;并以冲击强度和熔体流动速率作为主要考核指标,通过正交实验对扩链反应条件进行了优选。结果表明,反应温度和扩链剂用量是影响扩链效果的主要因素。在优化反应条件下制备的扩链产物,其重均分子量从5.8万提高到了30.3万,相应的熔体流动速率从8.28g/10min降低到了2.13g/10min,冲击强度比扩链前提高近3倍,显示出良好的扩链效果。
The melt chain extension reaction of recycled polylactic acid （R-PLA） was investigated using epoxy compound as the chain extender in the torque rheometer. The effects of chain extender amount, reaction time and reaction temperature on the chain extension reaction were examined. The reactive conditions were optimized by orthogonal experiment using the impact strength and the melt flow rate as the main examination indicators. The results show that reaction temperature and the content of chain extender are the main factors affecting chain extension reaction. Under the optimum reaction conditions, the molecular weight of R-PLA increases from 5.8 × 10^4 to 30.3 × 10^4, while the melt flow rate decreases from 8.28g/10min to 2.13g/10min correspondingly. The impact strength and the tensile strength of the chain-extended R-PLA increase by 182% and 62% than those of neat R-PLA, respectively. The experimental facts indicate that the epoxy-based chain extender has the good effect on R-PLA chain-extending reaction.
出处
《高分子材料科学与工程》
EI
CAS
CSCD
北大核心
2013年第9期48-52,共5页
Polymer Materials Science & Engineering
基金
国家自然科学基金面上项目(21274007)
北京市自然科学基金项目暨北京市教育委员会科技计划重点项目(KZ201110011014)
北京市教委科技创新平台项目(PXM2012-014213-000025)
北京市教委学科与研究生教育项目(PXM2012-014213-000088)
关键词
聚乳酸
回收利用
扩链改性
分子量
力学性能
poly（lactic acid）
recycle
chain extension modification
molecular weight
mechanical property
