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Synthesis of deoxy(thiosulfato)chitin as the precursor for noncatalytic photoinduced graft copolymerization
Author(s) -
Morita Yasumasa,
Sugahara Yasusato,
Ibonai Masaru,
Takahashi Akira
Publication year - 1999
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(19990110)71:2<189::aid-app1>3.0.co;2-h
Subject(s) - chitin , copolymer , grafting , monomer , polymer chemistry , acrylonitrile , chemistry , methyl methacrylate , polymerization , chitosan , polymer , organic chemistry
Photoinduced graft copolymerization of vinyl monomers onto deoxy(thiosulfato)chitin (S 2 O 3 –chitin) has been studied. Chitin was first tosylated and subsequently transformed into S 2 O 3 –chitin. S 2 O 3 –chitin has good solubility over tosyl–chitin. Graft copolymerization of S 2 O 3 –chitin proceeded very easily by ultraviolet irradiation without catalyst. Photolysis of S 2 O 3 groups was confirmed by infrared spectra. But the photolysis occurred only in quartz, not in a Pyrex tube. Methyl methacrylate (MMA) and acrylonitrile showed good grafting activities. In the case of acrylic acid and acryl amide, homopolymer formation was predominant, and the degree of grafting was low. We chose the MMA monomer for further information. The grafting rate of S 2 O 3 –chitin using MMA was much faster than those of chitin and O ‐acetyl–chitin. Under the appropriate conditions, the degree of grafting reached 600% only in 2 h, and the grafting efficiency was over 75% in any monomer concentration. But addition of DMSO into the polymerization system decreased the degree of grafting. © 1999 John Wiley & Sons, Inc. J Appl Polym Sci 71: 189–195, 1999