摘要
采用SEM、热台偏光显微镜研究了聚对苯二甲酸乙二酯（PET）／聚酰胺66（PA66）／热致液晶共聚脂酰胺（LC30）三元共混物的形态结构；利用Instron3211型毛细管流变仪研究了共混物的流变性能，结果表明：PET／PA66／LC30共混物为一热力学不相容的多相聚合物体系，LC30的加入提高了PET／PA66的相容性，有效地改善了PET／PA66共混物的流变性能．PET／PA66／LC30三元共混物熔体的流变曲线由低剪切速率下的切力变稀区和表现粘度基本恒定的准牛顿区组成，其表现粘度对共混组成的依赖性由PET／PA66共混物的负偏差行为转变为正偏差行为．共混物的形态结构、界面特征不同，导致共混体流变性质的差异．
The blends of poly(ethylene terephthalate) (PET), polyamlde 66 (PA66) andliquid crystalline copolyesteramide (LC30) were prepared by mechanical mixing. Theirmorphology and rheological properties were investigated by means of SEM, cross polarizingoptical microscope with hot-stage and Instron 3211 type capillary rheometer. The results showthat PET/PA66/LC30 is an incompatible multiphase blending system in thermo dynamics.The compatibility and rheological properties of PET/PA66 blends are greatly improved byadding LC30. The viscosity curves of PET/PA66/LC30 melts consist of two regions: a shearthinning region at low shear rate and a'pseudo Newtonian' region. PET/PA66/LC30 blendsshow the character of the positive deviation blends (PDB), whereas PET/PA66 blends showthe character of the negative deviation blends (NDB). The rheological properties of theseblends are affected by their morphologlcal structure.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
1997年第9期1551-1555,共5页
Chemical Journal of Chinese Universities
基金
国家重点化学工程联合实验室聚合反应工程实验室资助
关键词
PET
PA66
LC30
共混物
流变性能
Liquid crystalline copolyesteramide, Poly (ethylene terephthalate), Polyamide 66, Blends, Rheologlcal property
