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Aggregation behavior of 3,6‐O‐carboxymethylated chitin in aqueous solutions
Author(s) -
Chen Lingyun,
Du Yumin
Publication year - 2002
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/app.11093
Subject(s) - aqueous solution , chitin , viscometer , permeation , chemical engineering , hydrogen bond , gel permeation chromatography , chemistry , polymer chemistry , intermolecular force , polysaccharide , materials science , chitosan , molecule , polymer , organic chemistry , membrane , composite material , viscosity , biochemistry , engineering
The aggregation behavior of 3,6‐O‐carboxymethylated chitin (3,6‐O‐CM‐chitin) in aqueous solutions was investigated by viscometry, gel permeation chromatography (GPC), and GPC combined with laser light scattering (GPC‐LLS) techniques. 3,6‐O‐CM‐chitin has a strong tendency to form aggregates in NaCl aqueous solutions with the apparent aggregation number ( N ap ) of about 27. There were three kinds of aggregates corresponding to different cohesive energies, the aggregates with low cohesive energy were first dissociated at 60°C, the aggregates with middle cohesive energy were then dissociated at 80 to 90°C, and the aggregates with high cohesive energy were difficult to be disrupted by heating. Decreasing polysaccharide concentration ( c p ) or increasing NaCl concentration ( c s ) reduced the content of the aggregates. At the critical c p of 2.5 × 10 −5 g/mL, the aggregates were dissociated into single chains completely. The change of aggregation and disaggregation of 3,6‐O‐CM‐chitin in water–cadoxen mixtures occurred from 0.1 to 0.4 of v cad , and were irreversible. Intermolecular hydrogen bonding can be ascribed as main driving force for aggregation. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 86: 1838–1843, 2002