Sub-Tg relaxations and physical ageing in hydrated glassy polysaccharides

被引：5

作者：

Borde, B ^{[1
]}

Bizot, H ^{[1
]}

Vigier, G ^{[1
]}

Emery, J ^{[1
]}

Buleon, A ^{[1
]}

机构：

[1] INRA, LPCM, F-44316 Nantes 3, France

来源：

BIOPOLYMER SCIENCE: FOOD AND NON FOOD APPLICATIONS | 1999年 / 91期

关键词：

D O I：

10.4324/9780203027813.ch11

中图分类号：

S3 [农学（农艺学）];

学科分类号：

0901 ;

摘要：

Among the different models accounting for the physical ageing and more generally for the dynamics of glassy materials, the Quasi Point Defect model, (Perez, J. 1988, 1993), based on a solid state description, was chosen for the physical significance of its parameters. It was applied to simulate the effects of enthalpy relaxation on DSC traces of glassy polysaccharides. Dielectric spectroscopy in the domain of sub-Tg relaxations was used to determine the characteristic times and activation energies of the beta-relaxation, needed for the simulation procedure. DSC thermograms obtained after ageing at different ageing times and temperatures were both collected and simulated on glassy polysaccharides at various water contents.

引用

页码：167 / 171

页数：5

共 10 条

[1] MECHANICAL LOSS PROCESSES IN POLYSACCHARIDES [J].