Poly(neopentylene carbonate) Hyperstars

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 con...

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Bibliographic Details
Published in:Macromolecular chemistry and physics 2004-07, Vol.205 (11), p.1489-1496
Main Authors: Löwenhielm, Peter, Claesson, Hans, Hult, Anders
Format: Article
Language:English
Subjects:
acid
aliphatic polyesters
Applied sciences
behavior
block-copolymers
cationic polymerization
chromatography
crystallization
cyclic carbonates
Exact sciences and technology
hyperbranched
Organic polymers
Physicochemistry of polymers
polycarbonates
polylactones
Polymerization
Preparation, kinetics, thermodynamics, mechanism and catalysts
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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 Tg (20–30 °C) and Tm (100–110 °C) similar to linear PNPC. Boltorn™ hyperbranched polymer with radial polycarbonate grafts.
ISSN:1022-1352
1521-3935
1521-3935
DOI:10.1002/macp.200400006