STABILIZATION OF POLY(L-LACTIDE) IN THE MELT

被引：87

作者：

SODERGARD, A ^{[1
]}

NASMAN, JH ^{[1
]}

机构：

[1] ABO AKAD UNIV, DEPT POLYM TECHNOL, PORTHANSGATAN 3-5, SF-20500 TURKU, FINLAND

来源：

POLYMER DEGRADATION AND STABILITY | 1994年 / 46卷 / 01期

基金：

芬兰科学院;

关键词：

D O I：

10.1016/0141-3910(94)90104-X

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

The purpose of this study was to investigate the thermal degradation of poly(L-lactide) and to develop a stabilizer. The melt degradation of poly(L-lactide) was studied in the temperature range 180-220-degrees-C using a melt rheometer for monitoring changes in the melt viscosity. Further studies of the degraded PLLA were made using SEC, H-1-NMR and DSC. The thermal degradation was found to proceed by random main-chain scission. The mechanisms include depolymerization and oxidative degradation in the presence of oxygen. However, hydrolysis as well as intermolecular and intramolecular reactions could not be excluded. Benzoyl peroxide was found to stabilize the polymer against thermal degradation by deactivating the catalyst residues. The melting point of the stabilized polymer decreased with increasing peroxide concentration.

引用

页码：25 / 30

页数：6

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