Poly(neopentylene carbonate) Hyperstars
Peter Löwenhielm
Fibre and Polymer Technology, Royal Institute of Technology (KTH), Teknikringen 56–58 SE-100 44 Stockholm, Sweden
Search for more papers by this authorHans Claesson
Fibre and Polymer Technology, Royal Institute of Technology (KTH), Teknikringen 56–58 SE-100 44 Stockholm, Sweden
Search for more papers by this authorCorresponding Author
Anders Hult
Fibre and Polymer Technology, Royal Institute of Technology (KTH), Teknikringen 56–58 SE-100 44 Stockholm, Sweden
Fibre and Polymer Technology, Royal Institute of Technology (KTH), Teknikringen 56–58 SE-100 44 Stockholm, Sweden. Fax: (+46) 87908934Search for more papers by this authorPeter Löwenhielm
Fibre and Polymer Technology, Royal Institute of Technology (KTH), Teknikringen 56–58 SE-100 44 Stockholm, Sweden
Search for more papers by this authorHans Claesson
Fibre and Polymer Technology, Royal Institute of Technology (KTH), Teknikringen 56–58 SE-100 44 Stockholm, Sweden
Search for more papers by this authorCorresponding Author
Anders Hult
Fibre and Polymer Technology, Royal Institute of Technology (KTH), Teknikringen 56–58 SE-100 44 Stockholm, Sweden
Fibre and Polymer Technology, Royal Institute of Technology (KTH), Teknikringen 56–58 SE-100 44 Stockholm, Sweden. Fax: (+46) 87908934Search for more papers by this authorAbstract
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.
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