中国塑料2018，Vol.32Issue(6)：72-78,7.DOI:10.19491/j.issn.1001-9278.2018.06.011
原位反应法制备聚乳酸/聚氨酯共混物及性能
Preparation and Properties of Poly(lactic acid)/Polyurethane Blends via In-situ Reaction
摘要
Abstract
A series of poly(lactic acid)(PLA)/polyurethane (PU)blends were prepared by in-situ reaction of PLA with poly(tetramethylene ether glycol)(PTMG)and carbodiimide-modified MDI (L-MDI ).The reaction principle, mechanical properties, fracture morphology, dynamic rheological properties and crystalline properties of the resulting blends were investigated.The results indicated that micro-crosslinked polyurethane was formed during the in-situ reaction process along with the chain extension and branching of PLA.The mechanical results demonstrated that the toughness of PLA/PU blends was significantly enhanced,and their elongation at break,tensile toughness and notch impact strength were improved by 230 %,134.13 MJ/m3and 34.19 kJ/m2, respectively,compared to pure PLA,when 30 wt% of PU was incorporated.The toughening mechanism may be due to the crazes and shear zones induced by PU rubbery phase in the matrix. The rheological results indicated that the melts of pure PLA and its blends with PLA were pseudoplastic fluid,and however,the blends had a higher storage modulus and complex viscosity. The crystallization test suggested that the PLA/PU blends had a higher crystallization rate and more perfect level of crystallization in comparison with pure PLA.关键词
原位反应/聚乳酸/聚氨酯/共混物/力学性能Key words
in-situ reaction/poly(lactic acid)/polyurethane/blend/mechanical property分类
化学化工引用本文复制引用
王玉龙,闫鹤轩,贺玉龙,刘凉冰,李振中..原位反应法制备聚乳酸/聚氨酯共混物及性能[J].中国塑料,2018,32(6):72-78,7.基金项目
山西省"1331工程"优势特色学科项目 （）
山西省重点扶持学科项目 （）
太原工业学院重点科学基金(2017LZ02) （2017LZ02）
