Viscoelasticity of concentrated isotropic solutions of semiflexible polymers. 2. Linear response

被引:284
作者
Morse, DC [1 ]
机构
[1] Univ Minnesota, Dept Chem Engn & Mat Sci, Minneapolis, MN 55455 USA
关键词
D O I
10.1021/ma980304u
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
Linear rheological properties of tightly-entangled isotropic solutions of semi-flexible polymers are calculated using a tube model, and qualitative predictions are given for the response of more dilute solutions. The linear complex modulus of a solution of long, tightly-entangled chains is dominated at low frequencies by a curvature contribution, analogous to the elastic stress of entangled flexible chains, that relaxes by reptation and gives rise to a broad elastic plateau. The modulus is dominated at higher frequencies by a larger tension contribution, whose frequency dependence is controlled at intermediate frequencies by the diffusion of excess length along the tube and at very high frequencies by the unhindered transverse motion of the chain within the tube. This high-frequency regime yields a complex modulus that varies as G*(omega) proportional to (i omega)(3/4) With frequency omega. Solutions of shorter, rod-like chains also exhibit a slowly-decaying orientational contribution analogous to the elastic stress found in solutions of true rigid rods. The Linear response of the flow birefringence and the effect of cross-links between chains are also discussed.
引用
收藏
页码:7044 / 7067
页数:24
相关论文
共 54 条
[1]   VISCOSITY OF SEMI-DILUTE POLYMER-SOLUTIONS [J].
ADAM, M ;
DELSANTI, M .
JOURNAL DE PHYSIQUE, 1982, 43 (03) :549-557
[2]   VISCOSITY AND LONGEST RELAXATION-TIME OF SEMI-DILUTE POLYMER-SOLUTIONS .2. THETA-SOLVENT [J].
ADAM, M ;
DELSANTI, M .
JOURNAL DE PHYSIQUE, 1984, 45 (09) :1513-1521
[3]   Subdiffusion and anomalous local viscoelasticity in actin networks [J].
Amblard, F ;
Maggs, AC ;
Yurke, B ;
Pargellis, AN ;
Leibler, S .
PHYSICAL REVIEW LETTERS, 1996, 77 (21) :4470-4473
[4]   BROWNIAN DYNAMICS OF NONDILUTE SOLUTIONS OF RODLIKE POLYMERS .1. LOW CONCENTRATIONS [J].
BITSANIS, I ;
DAVIS, HT ;
TIRRELL, M .
MACROMOLECULES, 1988, 21 (09) :2824-2835
[5]   BROWNIAN DYNAMICS OF NONDILUTE SOLUTIONS OF RODLIKE POLYMERS .2. HIGH-CONCENTRATIONS [J].
BITSANIS, I ;
DAVIS, HT ;
TIRRELL, M .
MACROMOLECULES, 1990, 23 (04) :1157-1165
[6]  
BOHM JK, 1997, THESIS U TEXAS AUSTI
[7]   2-PARAMETER SCALING FOR POLYMERS IN THETA-SOLVENTS [J].
COLBY, RH ;
RUBINSTEIN, M .
MACROMOLECULES, 1990, 23 (10) :2753-2757
[8]  
DOI M, 1985, J POLYM SCI POL SYM, P93
[9]  
DOI M, 1978, J CHEM SOC FARAD T 2, V74, P918, DOI 10.1039/f29787400918
[10]  
Doi M., 1986, The theory of polymer dynamics