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Poly(neopentylene carbonate) Hyperstars
Author(s) -
Löwenhielm Peter,
Claesson Hans,
Hult Anders
Publication year - 2004
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.200400006
Subject(s) - polycarbonate , polymer chemistry , polymer , polymerization , trimethylene carbonate , chemistry , materials science , chemical engineering , organic chemistry , engineering
Summary: Branched aliphatic polycarbonates were synthesized by ring opening polymerization of 5,5‐dimethyl‐1,3‐dioxane‐2‐one (NPC) initiated from polyfunctional alcohols and a commercial hyperbranched polyester (BOLTORN®). Polymerizations in the presence of fumaric acid under bulk conditions allowed high conversion (80%) without gelation. The synthesis of polymers with long chain branches was confirmed by size exclusion chromatography and universal calibration. The Mark–Houwink exponent decreased, indicating an increased density, while increasing the number of arms. The star polymers with up to four arms showed thermal properties T g (20–30 °C) and T m (100–110 °C) similar to linear PNPC.Boltorn™ hyperbranched polymer with radial polycarbonate grafts.