Cooperative rearranging region size determination by temperature modulated DSC in semi-crystalline poly(L-lactide acid)

被引：52

作者：

Saiter, A. ^{[1
]}

Delpouve, N. ^{[1
]}

Dargent, E. ^{[1
]}

Saiter, J. M. ^{[1
]}

机构：

[1] Univ Rouen, Fac Sci, Inst Mat Rouen, Lab PBM UMR 6522, F-76801 St Etienne, France

来源：

EUROPEAN POLYMER JOURNAL | 2007年 / 43卷 / 11期

关键词：

PLLA; CRR; crystallinity; amorphous phase; cooperativity; thermal analysis;

D O I：

10.1016/j.eurpolymj.2007.07.039

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

Thermal analyzes have been performed on poly(L-lactide acid) (PLLA) annealed at 353 K for different durations in order to obtain a crystallinity degree varying between 0% and 42%. From temperature modulated differential scanning calorimetry investigations, we have calculated the average volume of a cooperative rearranging region (CRR) at the glass transition temperature xi(3)(Tg), according to the method developed by Donth. The results show that the presence of crystalline phase in PLLA amorphous matrix implies modifications on structural relaxation phenomena, in particular on the average number of monomer units relaxing in the same time at the glass transition temperature. (c) 2007 Elsevier Ltd. All rights reserved.

引用

页码：4675 / 4682

页数：8

共 31 条

[1] ON TEMPERATURE DEPENDENCE OF COOPERATIVE RELAXATION PROPERTIES IN GLASS-FORMING LIQUIDS [J].