Barrier properties of blends based on liquid crystalline polymers and polyethylene

被引：20

作者：

Flodberg, G

Hellman, A

Hedenqvist, MS

Sadiku, ER

Gedde, UW ^{[1
]}

机构：

[1] Royal Inst Technol, Dept Polymer Technol, SE-10044 Stockholm, Sweden

[2] Fdn Packforsk, Inst Packaging & Distribut, SE-16493 Kista, Sweden

来源：

POLYMER ENGINEERING AND SCIENCE | 2000年 / 40卷 / 09期

关键词：

D O I：

10.1002/pen.11328

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

Blends of an extrusion-grade polyethylene and two different liquid crystalline polymers of Vectra type were prepared by melt mixing using poly(ethylene-co-methacrylic acid) as compatibilizer. Oxygen and water vapor permeability, transparency and welding strength of compression molded and film blown specimens were studied. The compression molded blends showed gas permeabilities conforming to the Maxwell equation assuming low permeability liquid crystalline polymer spheres in a high permeability polyethylene matrix One of the liquid crystalline polymers with suitable rheological properties formed a more continuous phase in the film blown blends and a substantial decrease in oxygen and water vapor permeability was observed in these blends. The compression molded blends with 50% liquid crystalline polymer and some of blow molded blends showed very high gas permeabilities. It is believed that voids forming continuous paths through the structure were present in these samples. The blends showed significantly higher opacity than pure polyethylene.

引用

页码：1969 / 1978

页数：10