Viscoelasticity of near-critical silica-polyacrylamide hydrogel nanocomposites

被引：34

作者：

Adibnia, Vahid ^{[1
]}

Hill, Reghan J. ^{[1
]}

机构：

[1] McGill Univ, Dept Chem Engn, Montreal, PQ H3A005, Canada

来源：

POLYMER | 2017年 / 112卷

基金：

加拿大自然科学与工程研究理事会;

关键词：

Hydrogel nanocomposite; Viscoelastiticy; Sol-gel transition; Polyacrylamide; CROSS-LINKING; NANOPARTICLE; PARTICLES; POLYMER; SUSPENSIONS; GELATION;

D O I：

10.1016/j.polymer.2017.01.013

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 transition of silica-polyacrylamide hydrogel nanocomposites is studied when approaching the gel point by independently varying the nanoparticle (NP) and chemical crosslinker concentrations. Time-concentration-superposition (TCS) principles are applied to ascertain the effect of NPs on dynamics at the gel point. Doping dilute and concentrated polyacrylamide (PA) solutions with silica NPs indicates that these particles do not crosslink PA; neither do they form percolating networks. Nevertheless, silica NPs interact with PA to influence the storage and loss moduli to a much greater degree than expected for passive fillers. Interestingly, when silica NPs are embedded in very weakly chemically crosslinked PA (with a bis crosslinker concentration that would otherwise not form PA hydrogels), they significantly enhance the effective degree of crosslinking, forming viscoelastic solids. From TCS analysis of dynamics at the gel point, the bond probability is found to scale with the NP volume fraction as p similar to phi(1.5), whereas chemical crosslinking furnishes a bond probability that is linear in the crosslinker concentration. (C) 2017 Elsevier Ltd. All rights reserved.

引用

页码：457 / 465

页数：9

共 39 条

[1] Roles of chemical and physical crosslinking on the rheological properties of silica-doped polyacrylamide hydrogels [J].

Adibnia, Vahid ;

Taghavi, Seyed Mohammad ;

Hill, Reghan J. .

RHEOLOGICA ACTA, 2017, 56 (02) :123-134

[2] Universal aspects of hydrogel gelation kinetics, percolation and viscoelasticity from PA-hydrogel rheology [J].

Adibnia, Vahid ;

Hill, Reghan J. .

JOURNAL OF RHEOLOGY, 2016, 60 (04) :541-548

[3] Electroacoustic Spectroscopy of Nanoparticle-Doped Hydrogels [J].

Adibnia, Vahid ;

Hill, Reghan J. .

MACROMOLECULES, 2014, 47 (22) :8064-8071

[4] TIME CURE SUPERPOSITION DURING CROSS-LINKING [J].

ADOLF, D ;

MARTIN, JE .

MACROMOLECULES, 1990, 23 (15) :3700-3704

[5] THE RELATIONSHIP BETWEEN THE LINEAR (OSCILLATORY) AND NONLINEAR (STEADY-STATE) FLOW PROPERTIES OF A SERIES OF POLYMER AND COLLOIDAL SYSTEMS [J].

ALHADITHI, TSR ;

BARNES, HA ;

WALTERS, K .

COLLOID AND POLYMER SCIENCE, 1992, 270 (01) :40-46

[6] INTERACTION BETWEEN PARTICLES SUSPENDED IN SOLUTIONS OF MACROMOLECULES [J].

ASAKURA, S ;

OOSAWA, F .

JOURNAL OF POLYMER SCIENCE, 1958, 33 (126) :183-192

[7] Effect of polymer/filler interactions on the structure and rheological properties of ethylene-octene copolymer/nanosilica composites [J].

Bailly, Mathieu ;

Kontopoulou, Marianna ;

El Mabrouk, Khalil .

POLYMER, 2010, 51 (23) :5506-5515

[8] Electroacoustics of Particles Dispersed in Polymer Gel [J].

Bhosale, Prasad S. ;

Chun, Jaehun ;

Berg, John C. .

LANGMUIR, 2011, 27 (12) :7376-7379

[9] Rheological monitoring of polyacrylamide gelation: Importance of cross-link density and temperature [J].

Calvet, D ;

Wong, JY ;

Giasson, S .

MACROMOLECULES, 2004, 37 (20) :7762-7771

[10] LINEAR VISCOELASTICITY AT THE GEL POINT OF A CROSS-LINKING PDMS WITH IMBALANCED STOICHIOMETRY [J].

CHAMBON, F ;

WINTER, HH .

JOURNAL OF RHEOLOGY, 1987, 31 (08) :683-697

← 1 2 3 4 →