Poly (neopentylene carbonate) hyperstars
2004 (English)In: Macromolecular Chemistry and Physics, ISSN 1022-1352, E-ISSN 1521-3935, Vol. 205, no 11, 1489-1496 p.Article in journal (Refereed) Published
Branched aliphatic polycarbonates were synthesized by ring opening polymerization of 5,5-dimethyl-1,2-dioxane-2-one (NPC) initiated from polyfunctional alcohols and a commercial hyperbranched polyester (BOLTORN(R)). 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 (20-30degreesC) and T-m (100-110degreesC) similar to linear PNPC.
Place, publisher, year, edition, pages
2004. Vol. 205, no 11, 1489-1496 p.
cationic polymerization, chromatography, crystallization, hyperbranched, polycarbonates, cationic polymerization, aliphatic polyesters, cyclic carbonates, block-copolymers, behavior, acid, polylactones
IdentifiersURN: urn:nbn:se:kth:diva-23634DOI: 10.1002/macp.200400006ISI: 000223163500008ScopusID: 2-s2.0-4544315968OAI: oai:DiVA.org:kth-23634DiVA: diva2:342333
QC 20100525 QC 201109262010-08-102010-08-102011-09-26Bibliographically approved