Effect of polymer-precursor molecular mass on the formation and properties of covalently crosslinked chitosan cryogels

Nikonorov, V.V. and Ivanov, R.V. and Kil'deeva, N.R. and Lozinskii, V.I. (2010) Effect of polymer-precursor molecular mass on the formation and properties of covalently crosslinked chitosan cryogels. Polymer Science Series A, 53 (12). pp. 1150-1158.

Full text not available from this repository.

Abstract

Features of cryotropic gelation in moderately frozen solutions of chitosan samples that have various molecular masses and that are covalently crosslinked with glutaraldehyde are studied. It is shown that the chain length of the macromolecular precursor, chitosan, affects the yield of the gel fraction; the swelling ability of the polymer phase of wide-pore cryogels; the dimensions of the gross capillary pores of cryogels; and, as a consequence, the hydrodynamic parameters of columns packed with a permeable continuous matrix based on the spongy gel material. The characteristics of the latter depend in a sophisticated manner on the molecular mass of the polymer used for formation of cryogels, a circumstance that is associated with competition of differently directed factors, specifically cryoconcentration effects, a strong increase in the viscosity of the reaction medium in the unfrozen liquid microphase, kinetic features of chain crosslinking at a high concentration of reagents, etc. Therefore, in each particular case, individual conditions for specific combination of the above-mentioned parameters of the process arise. As a result, a complex dependence corresponding is observed for the efficiency of cryostructuring of the chitosan-glutaraldehyde system and for the properties of the resulting cryogels.

Item Type: Article
Subjects: Q Science > Q Science (General)
Depositing User: MR Faizal II H
Date Deposited: 09 Nov 2015 01:43
Last Modified: 09 Nov 2015 01:43
URI: http://eprints.um.edu.my/id/eprint/14699

Actions (login required)

View Item View Item