中国塑料2018，Vol.32Issue(5)：48-54,7.DOI:10.19491/j.issn.1001-9278.2018.05.007
高熔体弹性PLA/咖啡渣复合材料的发泡行为研究
Study on Foaming Behaviors of High Melt-elastic PLA/Coffee Ground Composites
摘要
Abstract
The preparation of PLA/coffee ground composites modified with diphenylmethane diisocyanate (MDI) was carried out by a melt-mixing method,and the resulting composites were formed by using supercritical CO2 as a foaming agent.The thermal,rheological and mechanical properties of composites were studied and their foaming behavior was investigated.The rheological results indicated that the melt elasticity of composites was improved in the presence of MDI due to a chain-extending reaction.The thermal and mechanical properties of composites were also influenced by MDI and coffee grounds.A bimodal behavior was observed in differential scanning calorimetric thermograms due to the melting and cold crystallization of PLA.The degree of cold crystallinity of PLA was improved up to 24.68 ％ due to the chain extension of MDI,which also resulted in an improvement in the impact resistance of the composites.Moreover,the composite foams achieved a cell density of 9.26 × 106 cell/cm3 and a foaming expansion ratio of 9.33.This indicated that the incorporation of MDI favored an improvement in melt elasticity for PLA/coffee ground composite and thus could well control the cellular structure of PLA foams.关键词
聚乳酸/咖啡渣/二苯基甲烷二异氰酸酯/发泡/扩链反应Key words
poly (lactic acid)/coffee grounds/diphenylmethane diisocyanate/foaming behavior/chain extending reaction分类
化学化工引用本文复制引用
刘伟,何仕成,杨余杰,王跃,周洪福..高熔体弹性PLA/咖啡渣复合材料的发泡行为研究[J].中国塑料,2018,32(5):48-54,7.基金项目
国家自然科学基金(51703039) （51703039）
黔科合[2016]支撑项目(2806) （2806）
