Time dependent properties of thermoreversible gels

被引：9

作者：

Borchard, W ^{[1
]}

Lechtenfeld, M ^{[1
]}

机构：

[1] Gerhard Mercator Univ Duisburg, Inst Phys & Theoret Chem, D-47057 Duisburg, Germany

来源：

MATERIALS RESEARCH INNOVATIONS | 2001年 / 4卷 / 5-6期

关键词：

thermoreversible gels; percolation theory; critical exponents; frequency dependency;

D O I：

10.1007/s100190000110

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Rheological properties of the system gelatin + water at a polymer concentration of 5.0% by wt at a temperature of 301 K and an angular frequency of 0.628 rads(-1) are presented and evaluated by use of the percolation theory. A frequency power law has been found close to the gel point from which a critical time range could be deduced in which the powers of the loss and storage modulus are the same. The times needed for the gelation from the percolation relations are close to the range where the exponents of the frequency power law relations are identical. The scaling coefficient a for physical gelation agrees very well with that found for chemical gelation by Durand and coworkers.

引用

页码：381 / 387

页数：7

共 51 条

[1]

ADAM M, 1979, J PHYS LETT-PARIS, V40, pL539, DOI 10.1051/jphyslet:019790040020053900

[2] CRITICAL PROPERTIES OF VISCOELASTICITY OF GELS AND ELASTIC PERCOLATION NETWORKS [J].

ARBABI, S ;

SAHIMI, M .

PHYSICAL REVIEW LETTERS, 1990, 65 (06) :725-728

[3]

ATKINS PW, 1986, PHYSICAL CHEM, P630

[4] Properties of thermoreversible gels [J].

Borchard, W .

BERICHTE DER BUNSEN-GESELLSCHAFT-PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 1998, 102 (11) :1580-1588

[5]

BORCHARD W, 1990, PROG COLL POL SCI S, V83, P200

[6]

BORCHARD W, 1989, MOL BASIS POLYM NETW, P162

[7]

BORCHARD W, 1999, UNPUB COLLOID POLYM

[8]

BORCHARD W, 1976, PHOTOGRAPHIC GELATIN, P57

[9]

BURG B, 1989, ROLD M, V3, P323

[10]

BURG B, 1988, THESIS U DUISBURG

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