Physical Properties of Diblock Methylcellulose Derivatives with Regioselective Functionalization Patterns: First Direct Evidence that a Sequence of 2,3,6-Tri-O-methyl-glucopyranosyl Units Causes Thermoreversible Gelation of Methylcellulose

被引：18

作者：

Nakagawa, Atsushi ^{[2
]}

Fenn, Dominik ^{[1
]}

Koschella, Andreas ^{[1
]}

Heinze, Thomas ^{[1
]}

Kamitakahara, Hiroshi ^{[2
]}

机构：

[1] Univ Jena, Inst Organ Chem & Macromol Chem, Ctr Excellence Polysaccharide Res, D-07743 Jena, Germany

[2] Kyoto Univ, Grad Sch Agr, Sakyo Ku, Kyoto 6068502, Japan

来源：

JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS | 2011年 / 49卷 / 21期

关键词：

methylcellulose; gelation; diblock copolymer; surface activity; differential scanning calorimetry; dynamic light scattering; fluorescent probe measurement; CO-OLIGOMERS;

D O I：

10.1002/polb.22343

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 [高分子化学与物理];

摘要：

This article describes detailed structure-property relationships of 5 regioselectively methylated celluloses and 10 diblock cellulose derivatives with regioselective functionalization patterns: methyl 2,3,6-tri-O- (1, 236MC), methyl 2,3-di-O- (2, 23MC), methyl 2,6-di-O- (3, 26MC), methyl 3-O- (4, 3MC), methyl 6-O-methyl-cellulosides (5, 6MC), methyl beta-D-glucopyranosyl-(1 -> 4)-2,3,6-tri-O-methyl- (6, G-236MC), methyl beta-D-glucopyranosyl (1 -> 4)-2,3-di-O-methyl- (7, G-23MC), methyl beta-D-glucopyranosyl-(1 -> 4)-2,6-di-O-methyl- (8, G-26MC), methyl beta-D-glucopyranosyl-(1 -> 4)-3-O-methyl- (9, G-3MC), methyl beta-D-glucopyranosyl-(1 -> 4)-6-O-methyl- (10, G-6MC), methyl beta-D-glucopyranosyl-(1 -> 4)-beta-D-glucopyranosyl-(1 -> 4)-2,3,6-tri-O-methyl- (11, GG-236MC), methyl beta-D-glucopyranosyl-(1 -> 4)-beta-D-glucopyranosyl-(1 -> 4)-2,3-di-O-methyl- (12, GG-23MC), methyl beta-D-glucopyranosyl-(1 -> 4)-beta-D-glucopyranosyl-(1 -> 4)-2,6-di-O-methyl- (13, GG-26MC), methyl beta-D-glucopyranosyl-(1 -> 4)-beta-D-glucopyranosyl-(1 -> 4)-3-O-methyl- (14, GG-3MC), and methyl beta-D-glucopyranosyl-(1 -> 4)-beta-D-glucopyranosyl-(1 -> 4)-6-O-methyl-cellulosides (15, GG-6MC). Surface tension, differential scanning calorimetry, fluorescence, and dynamic light scattering measurements of aqueous solutions of compounds 1-15 revealed that there was no relationship between aggregation behaviors and gel formation, gelation occurred only when the hydrophobic environments formed by hydrophobic interactions between the sequences of 2,3,6-tri-O-methyl-glucopyranosyl units upon heating. The diblock structure consisting of cellobiosyl block and approx. ten 2,3,6-tri-O-methyl-glucopyranosyl units was of crucial importance for thermoreversible gelation of methylcellulose. (C) 2011 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 49: 1539-1546, 2011

引用

页码：1539 / 1546

页数：8

共 17 条

[1]

Aggregation and network formation of aqueous methylcellulose and hydroxypropylmethylcellulose solutions [J].