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Poly (neopentylene ...
Poly (neopentylene carbonate) hyperstars
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- Löwenhielm, Peter (författare)
- KTH,Fiber- och polymerteknologi
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- Claesson, Hans (författare)
- KTH,Fiber- och polymerteknologi
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- Hult, Anders (författare)
- KTH,Polymerteknologi
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(creator_code:org_t)
- 2004-07-22
- 2004
- Engelska.
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Ingår i: Macromolecular Chemistry and Physics. - : Wiley. - 1022-1352 .- 1521-3935. ; 205:11, s. 1489-1496
- Relaterad länk:
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https://urn.kb.se/re...
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visa fler...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- 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.
Ämnesord
- TEKNIK OCH TEKNOLOGIER -- Kemiteknik -- Polymerteknologi (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Chemical Engineering -- Polymer Technologies (hsv//eng)
Nyckelord
- cationic polymerization
- chromatography
- crystallization
- hyperbranched
- polycarbonates
- cationic polymerization
- aliphatic polyesters
- cyclic carbonates
- block-copolymers
- behavior
- acid
- polylactones
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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