Synthesis of hyperbranched carbohydrate polymers by ring-opening multibranching polymerization of anhydro sugar.
The synthesis of novel hyperbranched carbohydrate polymers, prepared by the ring-opening multibranching polymerizations of anhydro and dianhydro sugars, is described. The hyperbranched carbohydrate polymers were formed by the cationic polymerization of 1,6-anhydro-beta-D-hexopyranose, 1,4-anhydrotetritol, 2,3-anhydrotetritol, and 1,2:5,6-dianhydro-D-mannitol. These polymerizations proceeded without gelation to produce water-soluble hyperbranched carbohydrate polymers with controlled molecular weights and narrow polydispersities. The values for the degree of branching of the polymers were in the range of 0.28-0.50. The polymerization method, which proceeds through a ring-opening reaction by a proton-transfer reaction mechanism, is a facile method leading to a spherical carbohydrate polymer with a high degree of branching.
Satoh
Toshifumi
T
Division of Biotechnology and Macromolecular Chemistry, Graduate School of Engineering, Hokkaido University, Sapporo 060-8628, Japan. satoh@poly-bm.eng.hokudai.ac.jp
Kakuchi
Toyoji
T
D001704:Biopolymers / Q000737:chemistry; D002236:Carbohydrate Conformation; D002241:Carbohydrates / Q000138:chemical synthesis* / Q000737:chemistry*; D002625:Chemistry, Organic / Q000379:methods*; D008353:Mannitol / Q000737:chemistry; D011522:Protons; D013696:Temperature; D013780:Tetroses / Q000737:chemistry
D001704:Biopolymers; D002241:Carbohydrates; D011522:Protons; D013780:Tetroses; C002053:tetritol; D008353:Mannitol