Premium
Blend membranes from carboxymethylated chitosan/alginate in aqueous solution
Author(s) -
Zhang Lina,
Guo Ji,
Zhou Jinping,
Yang Guang,
Du Yumin
Publication year - 2000
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/(sici)1097-4628(20000718)77:3<610::aid-app16>3.0.co;2-b
Subject(s) - chitosan , membrane , alginic acid , miscibility , aqueous solution , pervaporation , materials science , permeation , chemical engineering , polymer chemistry , vinyl alcohol , polyelectrolyte , polymer blend , polymer , nuclear chemistry , chemistry , composite material , copolymer , organic chemistry , biochemistry , engineering
The blend membranes were satisfactorily prepared by coagulating a mixture of O‐carboxymethylated chitosan (CM‐chitosan) and alginate in aqueous solution with 5 wt % CaCl 2 , and then by treating with 1 wt % HCl aqueous solution. Their structure and miscibility were characterized by scanning electron micrograph, X‐ray diffraction, infrared spectra, differential thermal analysis, and atomic absorption spectrophotometer. The results indicated that the blends were miscible, when the weight ratio of CM‐chitosan to alginate was in the range from 1 : 1 to 1 : 5. The polymers interpenetration including a Ca 2+ crosslinked bridge occurred in the blend membrane, and leads to high separation factor for pervaporation separation of alcohol/water and low permeation. The tensile strength in the wet state (σ b = 192 kg cm −2 for CM‐chitosan/alginate 1 : 1) and thermostability of the blend membranes were significantly superior to that of alginic acid membrane, and cellulose/alginate blend membranes, owing to a strong electrostatic interaction caused by —NH 2 groups of CM‐chitosan with —COOH groups of algic acid. © 2000 John Wiley & Sons, Inc. J Appl Polym Sci 77: 610–616, 2000