Chemical and physical hydrogels: two casesystems studied by quasi elastic light scattering

被引:28
作者
Bordi, F
Paradossi, G
Rinaldi, C
Ruzicka, B
机构
[1] Univ Roma La Sapienza, Dipartimento Fis, Inst Nazl Fis Fis, I-00185 Rome, Italy
[2] Univ Roma Tor Vergata, Dipartimento Med Interna, Rome, Italy
[3] Univ Roma La Sapienza, Ist Nazl Fis Mat, I-00185 Rome, Italy
[4] Univ Roma Tor Vergata, Dipartimento Chim, Rome, Italy
关键词
poly (vinyl alcohol); xanthan; glucomannan; hydrogels; dynamic light scattering;
D O I
10.1016/S0378-4371(01)00537-4
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
A chemical hydrogel based on telechelic poly(vinyl alcohol) and a physical synergic hydrogel, xanthan-glucomannan, were studied by means of dynamic light scattering technique. Two different nonergodic methods. due to Pusey et al. (Physica A 157 (1989) 705, Phys. Rev. A 42 (1990) 2161) and Xue et al. (Phys. Rev. A 46 (1992) 6550). were used to obtain the correct dynamic structure factors f(q,t). Good agreement between the results obtained with the two procedures was found. The behavior of the f(q,t) for different q vectors is consistent with the hypothesis that the nonfluctuating component in the scattered light is not due to microscopic heterogeneities but to restricted motion of the scatterers. The model of Krall et al. (Phys, Rev. Lett. 80 (1998) 778, Physica A 235 (1997) 19) was successfully applied to both hydrogels to extract the characteristic parameters of the network from the f(q,t) functions. (C) 2002 Published by Elsevier Science B.V.
引用
收藏
页码:119 / 128
页数:10
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