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Synthesis of Hyperbranched Polysaccharide by Thermally Induced Cationic Polymerization of 1,6‐Anhydrohexopyranose
Author(s) -
Satoh Toshifumi,
Imai Tomoko,
Kitajyo Yoshikazu,
Maeda Takahiro,
Narumi Atsushi,
Kaga Harumi,
Kaneko Noriaki,
Kakuchi Toyoji
Publication year - 2004
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.200451304
Subject(s) - cationic polymerization , branching (polymer chemistry) , monomer , polymerization , polymer chemistry , polysaccharide , chemistry , degree of polymerization , ring opening polymerization , materials science , polymer , organic chemistry
The thermally induced cationic polymerizations of 1,6‐anhydro‐β‐ D ‐glucopyranose ( 1a ), 1,6‐anhydro‐β‐ D ‐mannopyranose ( 1b ) and 1,6‐anhydro‐β‐ D ‐galactopyranose ( 1c ) as a latent cyclic AB 4 ‐type monomer were carried out using ( S ‐2‐butenyl)tetramethylenesulfonium hexafluoroantimonate ( 2 ) as an initiator. The solution polymerization in propylene carbonate proceeded without gelation to produce the water‐soluble hyperbranched polysaccharides ( 3a‐c ) with controlled molecular weights and narrow polydispersities. The degree of branching (DB), estimated by the methylation analysis of 3a‐c , was in the range of 0.38 – 0.49. The thermally induced cationic polymerization of 1a‐c using 2 is a facile method leading to a hyperbranched polysaccharide with a high DB value.