Effect of polyethylene glycol on the crystallization,rheology and foamability of poly(lactic acid)containing in situ generated polyamide 6 nanofibrils  

作　　者：Yuhui Qiao Qian Li Amirjalal Jalali Dongsheng Yu Xichan He Xiaofeng Wang Jing Jiang Zhiyu Min 

机构地区：[1]Department of Materials Science and Engineering,Luoyang Institute of Science and Technology,Luoyang 471023,China [2]Henan Province International Joint Laboratory of Materials for Solar Energy Conversion and Lithium Sodium Based Battery,Luoyang Institute of Science and Technology,Luoyang 471023,China [3]National Center for International Research of Micro-Nano Molding Technology,Zhengzhou 450001,China [4]Microcellular Plastics Manufacturing Laboratory,Department of Mechanical and Industrial Engineering,University of Toronto,Toronto M5S 3G8,Canada [5]School of Mechanical and Power Engineering,Zhengzhou University,Zhengzhou 450001,China

出　　处：《Frontiers of Chemical Science and Engineering》2023年第12期2074-2087,共14页化学科学与工程前沿（英文版）

基　　金：grateful for support from the Key Scientific and Technological Projects of Henan Province(Grant Nos.232102230153,232102230158,and for international cooperation 232102521021);the National Natural Science Joint Fund of China(Grant No.U1909219);the Key R&D Project of Henan Province(Grant No.221111520200);the Scientific and Technological Research Project of Henan Province(Grand No.202102210028).

摘　　要：In this study,the rheological properties,crystallization and foaming behavior of poly(lactic acid)with polyamide 6 nanofibrils were examined with polyethylene glycol as a compatibilizer.Polyamide 6 particles were deformed into nanofibrils during drawing.For the 10%polyamide 6 case,polyethylene glycol addition reduced the polyamide 6 fibril diameter from 365.53 to 254.63 nm,owing to the smaller polyamide 6 particle size and enhanced interface adhesion.Rheological experiments revealed that the viscosity and storage modulus of the composites were increased,which was associated with the three-dimensional entangled network of polyamide 6 nanofibrils.The presence of higher aspect ratio polyamide 6 nanofibrils substantially enhanced the melt strength of the composites.The isothermal crystallization kinetics results suggested that the polyamide 6 nanofibrils and polyethylene glycol had a synergistic effect on accelerating poly(lactic acid)crystallization.With the polyethylene glycol,the crystallization half-time reduced from 103.6 to 62.2 s.Batch foaming results indicated that owing to higher cell nucleation efficiency,the existence of polyamide 6 nanofibrils led to a higher cell density and lower expansion ratio.Furthermore,the poly(lactic acid)/polyamide 6 foams exhibited a higher cell density and expansion ratio than that of the foams without polyethylene glycol.

关 键 词：poly(lactic acid) FOAMING microfibrillation rheological property CRYSTALLIZATION 

分 类 号：O63[理学—高分子化学]