Reinforcement with cellulose nanocrystals of poly(vinyl alcohol) hydrogels prepared by cyclic freezing and thawing

被引：178
|
作者：
Abitbol, Tiffany [1 ]
Johnstone, Timothy [1 ]
Quinn, Thomas M. [2 ]
Gray, Derek G. [1 ]
机构：
[1] McGill Univ, Dept Chem, Montreal, PQ H3A 2A7, Canada
[2] McGill Univ, Dept Chem Engn, Montreal, PQ H3A 2B2, Canada
来源：
SOFT MATTER | 2011年 / 7卷 / 06期
基金：
加拿大自然科学与工程研究理事会;
关键词：
POLYVINYL-ALCOHOL; PVA HYDROGELS; NANOWHISKERS; SUSPENSIONS; MORPHOLOGY; GELS;
D O I：
10.1039/c0sm01172j
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Cellulose nanocrystals (CNCs) were incorporated into polyvinyl alcohol (PVA) hydrogels prepared by repeated freeze-thaw processing. The CNC-loaded hydrogels had improved structural stabilities and distinct microstructures, characterized by ordered domains of CNCs. The water sorption of the gels increased with CNC content due to the hydrophilic nature of the cellulose and the decrease in PVA crystallinity. A reinforcement effect was observed in the CNC-loaded samples upon the application of uniaxial, confined compression, with the elastic moduli of the PVA-CNC samples increased relative to pure PVA hydrogels. Hydraulic permeability values were derived from the stress transients: at strains of similar to 15 to 20% and greater, the permeability of all samples approached a plateau value reflective of the hindered flow in soft gels which have been compressed, densified and dehydrated.
引用
收藏
页码：2373 / 2379
页数：7
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