THE DEVELOPMENT OF LAMINAR MORPHOLOGY DURING EXTRUSION OF POLYMER BLENDS

被引:70
作者
KAMAL, MR
GARMABI, H
HOZHABR, S
ARGHYRIS, L
机构
[1] Department of Chemical Engineering, Mcgill University, Montreal, Quebec
关键词
D O I
10.1002/pen.760350107
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
Studies of the microstructure and permeability of extruded ribbons of polypropylene (PP)/ethylene vinyl alcohol copolymer (EVOH) and polyethylene (PE)/polyamide-6 (PA-6) blends have shown that it is possible to control the flow-inducedd morphology to generate discontinuous overlapping platelets of EVOH or PA-6 dispersed phase in a PP or HDPE matrix phase. The effects of the following factors on morphology development and blend properties were considered: blending sequence, melt temperature, composition, compatibilizer level, die design, screw type, and cooling conditions. The impact properties and interfacial adhesion of laminar blends of PP and EVOH were improved without diminishing the barrier properties. The oxygen and toluene permeability of extruded samples with EVOH content of 25 vol% resembled values obtained with multilayer systems. Processing conditions had a major influence on the morphology of blends of high density polyethylene and polyamide-6 (HDPE/PA-6), and, under special processing conditions, laminar morphology was obtained in this system. The toluene permeability of extruded ribbons of HDPE/PA-6 blends was in the range obtained with multilayer systems.
引用
收藏
页码:41 / 51
页数:11
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