Free radical branching of polylactide by reactive extrusion

被引：113

作者：

Carlson, D

Dubois, P ^{[1
]}

Nie, L

Narayan, R

机构：

[1] Michigan State Univ, Dept Chem Engn, E Lansing, MI 48823 USA

[2] Univ Mons, Dept Polymer & Composite Mat, B-7000 Mons, Belgium

[3] Michigan Biotechnol Inst, Lansing, MI 48910 USA

来源：

POLYMER ENGINEERING AND SCIENCE | 1998年 / 38卷 / 02期

关键词：

D O I：

10.1002/pen.10192

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

The reactive extrusion of polylactide (PLA) with a free radical initiator resulting in a branched polymer was accomplished. Reaction conditions were in the range of 160 degrees C to 200 degrees C with an initiator concentration between 0.0 and 0.5%. Triple detector size exclusion chromatography, melt flow index, thermal gravimetric analysis, differential scanning calorimetry, and dynamic mechanical analysis were used to characterize the polylactide polymers. PLA without initiator showed extensive degradation as was evidenced by a decrease in both molecular weight and melt viscosity. The optimum range for branching resulting in a high molecular weight and low melt flow index polylactide was found to be around 170 degrees C to 180 degrees C and 0.1 to 0.25% initiator.

引用

页码：311 / 321

页数：11

共 23 条

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