The effect of crystallization on the solid state polycondensation of poly(L-lactic acid)

被引：24

作者：

Xu, Hong ^{[1
]}

Luo, Minghua ^{[1
]}

Yu, Muhuo ^{[1
]}

Teng, Cuiqing ^{[1
]}

Xie, Si ^{[1
]}

机构：

[1] Donghua Univ, Coll Mat Sci & Engn, State Key Lab Modificat Chem Fibers & Polymer Mat, Shanghai 200051, Peoples R China

来源：

JOURNAL OF MACROMOLECULAR SCIENCE PART B-PHYSICS | 2006年 / 45卷 / 04期

关键词：

poly(L-lactic acid); crystallization; solid-state polycondensation;

D O I：

10.1080/00222340600770400

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

Melt solid polycondensation is an approach to increase the molecular weight of poly (L-lactic acid) (PLLA). For this report, the effect of crystallization time of PLLA prepolymer on the molecular weight of the biomaterial was studied. In this process, PLLA prepolymer with a molecular weight of 18,000 was first prepared by the ordinary melt-polycondensation process. The prepolymer was crystallized at 105 degrees C for various times, and then heated at 135 degrees C for 15-50 h for further solid state polycondensation (SSP). The differential scanning calorimetry (DSC) and viscosity measurements were used to characterize the crystalline properties and molecular weight of the resulting PLLA polymers, respectively. The results showed that the molecular weight of PLLA reached a maximum value under the condition of a crystallization time of 30 min and SSP of 35 h.

引用

页码：681 / 687

页数：7

共 15 条

[1] Effect of antimony catalyst on solid-state polycondensation of poly(ethylene terephthalate) [J].