Thermal fluctuations in polymer gels investigated by neutron spin echo and dynamic light scattering

被引:28
作者
Hecht, AM
Horkay, F
Schleger, P
Geissler, E
机构
[1] Univ Grenoble 1, CNRS, UMR 5588, Spectrometrie Phys Lab, F-38402 St Martin Dheres, France
[2] NICHD, Sect Tissue Biophys & Biomimet, Lab Integrat & Med Biophys, NIH, Bethesda, MD 20892 USA
[3] Inst Max Von Laue Paul Langevin, F-38042 Grenoble, France
关键词
D O I
10.1021/ma020507p
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
Measurements are described involving neutron spin echo and quasi-elastic light scattering in an end-linked polyfluorosilicone (PFS) gel swollen in acetone as well as in the equivalent solution. Small-angle elastic neutron scattering measurements were performed on the same system. For the PFS-acetone system, both dynamic light scattering and neutron spin echo yield similar results for the characteristic relaxation rates and for the intensity scattered by concentration fluctuations. It is shown that the relaxing part of the spin echo decay is described by the same thermodynamic concentration fluctuations that define the osmotic modulus of the system. Both the collective diffusion coefficient and the intensity of the dynamically scattered light are found to be greater in the gel than in the solution. This difference indicates that the polymer solvent friction coefficient in the cross-linked network is lower than in the un-cross-linked solution.
引用
收藏
页码:8552 / 8555
页数:4
相关论文
共 12 条
[1]  
de Gennes P.G., 1979, SCALING CONCEPTS POL
[2]   SCATTERING BY AN INHOMOGENEOUS SOLID [J].
DEBYE, P ;
BUECHE, AM .
JOURNAL OF APPLIED PHYSICS, 1949, 20 (06) :518-525
[3]   COMPRESSIONAL MODULUS OF SWOLLEN POLYACRYLAMIDE NETWORKS [J].
GEISSLER, E ;
HECHT, AM ;
HORKAY, F ;
ZRINYI, M .
MACROMOLECULES, 1988, 21 (08) :2594-2599
[4]   SCATTERING FROM NETWORK POLYDISPERSITY IN POLYMER GELS [J].
GEISSLER, E ;
HORKAY, F ;
HECHT, AM .
PHYSICAL REVIEW LETTERS, 1993, 71 (04) :645-648
[5]  
Geissler E., 1993, Dynamic Light Scattering
[6]   STRUCTURE AND DYNAMICS OF A POLY(DIMETHYLSILOXANE) NETWORK - A COMPARATIVE INVESTIGATION OF GEL AND SOLUTION [J].
HECHT, AM ;
GUILLERMO, A ;
HORKAY, F ;
MALLAM, S ;
LEGRAND, JF ;
GEISSLER, E .
MACROMOLECULES, 1992, 25 (14) :3677-3684
[7]   Neutron scattering investigations on a bimodal polymer gel [J].
Hecht, AM ;
Horkay, F ;
Geissler, E .
JOURNAL OF PHYSICAL CHEMISTRY B, 2001, 105 (24) :5637-5642
[8]   THERMODYNAMIC PROPERTIES OF POLY(VINYL ALCOHOL) AND POLY(VINYL ALCOHOL VINYL-ACETATE) HYDROGELS [J].
HORKAY, F ;
BURCHARD, W ;
GEISSLER, E ;
HECHT, AM .
MACROMOLECULES, 1993, 26 (06) :1296-1303
[9]   DYNAMICAL SCALING IN POLYMER-SOLUTIONS INVESTIGATED BY NEUTRON SPIN-ECHO TECHNIQUE [J].
RICHTER, D ;
HAYTER, JB ;
MEZEI, F ;
EWEN, B .
PHYSICAL REVIEW LETTERS, 1978, 41 (21) :1484-1487
[10]  
Sears V.F., 1992, Neutron News, V3, P26, DOI [10.1080/10448639208218770, DOI 10.1080/10448639208218770]