FREQUENCY-DEPENDENCE OF VISCOELASTIC PROPERTIES OF SOME PHYSICAL GELS NEAR THE GEL POINT

被引：48
|
作者：
CUVELIER, G
LAUNAY, B
机构：
[1] ENSIA, Massy, 91300, 1, Av. des Olympiades
来源：
MAKROMOLEKULARE CHEMIE-MACROMOLECULAR SYMPOSIA | 1990年 / 40卷
关键词：
D O I：
10.1002/masy.19900400105
中图分类号：
O63 [高分子化学（高聚物）];
学科分类号：
070305 ; 080501 ; 081704 ;
摘要：
The sol-gel and gel-sol transitions of three biopolymer gelling systems (gelatin, iota-carrageenan and xanthan-carob) have been studied by dynamic measurements. At the gel point a power law dependence of the storage (G') and loss (G") moduli on frequency is observed, with an exponent varying from 0.5 to 0.65. The variation of log(tg-delta = G"/G') versus the gelation (or melting) parameter (time or temperature) at different frequencies leads to a precise determination of the gel point.
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页码：23 / 31
页数：9
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