Analysis of the reorganization of poly(ethylene terephthalate) in the melting range by temperature-modulated calorimetry

被引：44

作者：

Schick, C

Merzlyakov, M

Wunderlich, B ^{[1
]}

机构：

[1] Oak Ridge Natl Lab, Div Chem & Analyt Sci, Oak Ridge, TN 37831 USA

[2] Univ Rostock, Dept Phys, D-18051 Rostock, Germany

[3] Univ Tennessee, Dept Chem, Knoxville, TN 37996 USA

来源：

POLYMER BULLETIN | 1998年 / 40卷 / 2-3期

关键词：

Heat Capacity; Temperature Modulation; Calorimetry; Macromolecule; Calorimeter;

D O I：

10.1007/s002890050255

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

Although melting of flexible macromolecules is an irreversible process, it was demonstrated recently with temperature-modulated calorimetry (TMC) that some of the overall melting may be reversible within a fraction of a kelvin. This was taken as evidence for incompletely melted molecules with a remaining molecular nucleus. The reversing heat capacity that characterizes this effect was observed to decrease with time. It is shown by new TMC experiments that this time effect is not induced by the temperature modulation, but is due to an inherent annealing process. It is also proven that it is not dependent on the type of calorimeter.

引用

页码：297 / 303

页数：7