摘要
通过熔融共混制备了不同聚乳酸(PLA)含量的聚己内酯(PCL)/PLA共混物,研究了PLA含量对共混物相形态以及流变性能的影响,并通过超临界CO2发泡研究了相形态及黏弹性对泡孔结构的影响。结果表明,随着PLA含量的增加,分散相的尺寸和密度均有所增加,并且PLA的添加提高了共混物的黏弹性。在超临界CO2发泡过程中,异相成核点增加,泡孔密度提高,且熔体强度的提高有效抑制了发泡过程中泡孔的塌陷,泡孔形貌得到改善,并且对孔隙率和开孔率进行了分析,给出了开孔机理。
The polycapro lactone(PCL)/poly(lactic acid)(PLA) blends with different PL A contents were prepared by melt blending.The effects of PLA contents on the phase morphology and rheological properties of the blends were studied.The effects of phase morphology and viscoelasticity on the cell structure were investigated by supercritical carbon dioxide(CO2) foaming.The results show that with the increase of PLA contents,the size and density of the dispersed phase are increased,and the viscoelasticity of the blends is improved by the addition of PLA.In the process of supercritical CO2 foaming,the number of heterogeneous nucleation point raises.The cell density increases.The improvement of melt strength could effectively inhibit the collapse of foam hole in the forming process and the morphology of cell is improved.The porosity and opening rate are analyzed,and the opening mechanism is explained.
作者
蒋晶
郭海洋
侯建华
李倩
JIANG Jing;GUO Hai-yang;HOU Jian-hua;LI Qian(School of Mechanical and Power Engineering,Zhengzhou University,Zhengzhou 450001,China;School of Mechanics and Safety Engineering,Zhengzhou University,Zhengzhou 450001,China;National International Joint Research Center for Micro-Nano Moulding Technology,Zhengzhou university,Zhengzhou 450001,China)
出处
《塑料工业》
CAS
CSCD
北大核心
2020年第7期24-28,共5页
China Plastics Industry
基金
河南省高端外国专家引进计划(HNGDB20200020)。
关键词
聚己内酯
聚乳酸
超临界CO2发泡
流变性质
泡孔结构
Polycaprolactone
Poly(lactic acid)
Supercritical Carbon Dioxide Foaming
Rheological Properties
Cell Structure
