4.7 Article

Cellulose nanofibers reinforced sodium alginate-polyvinyl alcohol hydrogels: Core-shell structure formation and property characterization

Journal

CARBOHYDRATE POLYMERS
Volume 147, Issue -, Pages 155-164

Publisher

ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2016.04.005

Keywords

Core-shell structure; Hydrogel; Interpenetrating polymer network; Nanoparticles; Absorption

Funding

  1. School of Renewable Natural Resources, LSU AgCenter through the USDA National Institute of Food and Agriculture McIntire Stennis project [1000017]

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Core-shell structured hydrogels consisting of a flexible interpenetrating polymer network (IPN) core and a rigid semi-IPN shell were prepared through chemical crosslinking of polyvinyl alcohol (PVA) and sodium alginate (SA) with Ca2+ and glutaraldehyde. Short cellulose nanofibers (CNFs) extracted from energycane bagasse were incorporated in the hydrogel. The shell was micro-porous and the core was macro-porous. The hydrogels could be used in multiple adsorption-desorption cycles for dyes, and the maximum methyl blue adsorption capacity had a 10% increase after incorporating CNFs. The homogeneous distribution of CNFs in PVA-SA matrix generated additional hydrogen bonds among the polymer molecular chains, resulting in enhanced density, viscoelasticity, and mechanical strength for the hydrogel. Specifically, the compressive strength of the hydrogel reached 79.5 kPa, 3.2 times higher than that of the neat hydrogel. (C) 2016 Elsevier Ltd. All rights reserved.

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