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Title: Semi-Interpenetrating polymer network hydrogels based on aspen hemicellulose and chitosan: Effect of crosslinking sequence on hydrogel properties

Source: Journal of Applied Polymer Science, Volume 124, pp. 1168-1177; 2012.

Author(s)Karaaslan, Muzaffer Ahmet; Tshabalala, Mandla A.; Buschle-Diller, Gisela

Publication Year: 2012  View PDF »

Category: Journal Articles
Associated Research Project(s):   FPL-4707-3A

Abstract: Semi-interpenetrating network hydrogel films were prepared using hemicellulose and chemically crosslinked chitosan. Hemicellulose was extracted from aspen by using a novel alkaline treatment and characterized by HPSEC, and consisted of a mixture of high and low molecular weight polymeric fractions. HPLC analysis of the acid hydrolysate of the hemicellulose showed that its major constituent sugar was xylose. X-ray analysis showed that the relative crystallinity of hydrogels increased with increasing hemicellulose content up to 31.3%. Strong intermolecular interactions between chitosan and hemicellulose were evidenced by FT-IR analysis. Quantitative analysis of free amino groups showed that hemicellulose could interrupt the chemical crosslinking of chitosan macromolecules. Mechanical testing and swelling experiments were used to define the effective network crosslink density and average molecular weight between crosslinks. Swelling ratios increased with increasing hemicellulose content and mainly consisted of H-bonded bound water. Results revealed that by altering the hydrogel preparation steps and hemicellulose content, crosslink density and swelling behavior of semi-IPN hydrogels could be controlled without deteriorating their mechanical properties.

Keywords: hemicellulose, hydrogel, film, semi-interpenetrating, chitosan

Publication Review Process: Formally Refereed

File size: 701 kb(s)

Date posted: 09/27/2012

This publication is also viewable on Treesearch:  view
RITS Product ID: 61855
Current FPL Scientist associated with this product
Tshabalala, Mandla A.
Research Chemist
  

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