Cooperativity length evolution during crystallization of poly(lactic acid)

被引：80

作者：

Delpouve, N. ^{[1
]}

Saiter, A. ^{[1
]}

Dargent, E. ^{[1
]}

机构：

[1] Univ Rouen, AMME LECAP EA Int Lab 4528, Ave Univ BP 12, F-76801 St Etienne, France

来源：

EUROPEAN POLYMER JOURNAL | 2011年 / 47卷 / 12期

关键词：

Poly(lactic acid); Glass transition; Crystallization; Amorphous phase; Three-phase model; Cooperativity length; MULTIPLE MELTING BEHAVIOR; REARRANGING REGION SIZE; DYNAMIC GLASS-TRANSITION; RIGID AMORPHOUS FRACTION; POLY(L-LACTIC ACID); SILICATE NANOCOMPOSITES; THERMAL-BEHAVIOR; DRAWN PET; PHASE; DSC;

D O I：

10.1016/j.eurpolymj.2011.09.027

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

Effects of stereoregularity and crystallization mode on the amorphous phase dynamics are investigated for poly(lactic acid) PIA An isothermal crystallization from the melt and a cold crystallization are imposed. For each PLA, the cold crystallization leads to the appearance of a less perfect crystalline phase and to an important rigid amorphous fraction RAF content (35%), although only 10% of RAF is generated after crystallization from the melt. Temperature Modulated Differential Scanning Calorimetry is used to determine the Cooperative Rearranging Regions (CRR) size at the glass transition temperature in the mobile amorphous phase MAP. It is shown that the CRR size in the MAP is not modified by the appearance and the spherulite growth. For the intra-spherulite MAP, a confining effect is evidenced, causing an amorphous phase thickness decrease during crystallization, and inducing a drastic CRR size reduction. (C) 201 1 Elsevier Ltd. All rights reserved.

引用

页码：2414 / 2423

页数：10

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