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Fibrillar structure...
Fibrillar structure of resorbable microblock copolymers based on 1,5-dioxepan-2-one and epsilon-caprolactone
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- Andronova, Natalia (author)
- KTH,Fiber- och polymerteknologi
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- Finne, Anna (author)
- KTH,Fiber- och polymerteknologi
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- Albertsson, Ann-Christine (author)
- KTH,Fiber- och polymerteknologi
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(creator_code:org_t)
- 2003-06-23
- 2003
- English.
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In: Journal of Polymer Science Part A. - : Wiley. - 0887-624X .- 1099-0518. ; 41:15, s. 2412-2423
- Related links:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Subject headings
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- The copolymerization of 1,5-dioxepan-2-one (DXO) and E-caprolactone, initiated by a five-membered cyclic tin alkoxide initiator, was performed in chloroform at 60 degreesC. Copolymers with different molar ratios of DXO (25, 40, and 60%) were synthesized and characterized. C-13 NMR spectroscopy of the carbonyl region revealed the formation of copolymers with a blocklike structure. Differential scanning calorimetry measurements showed that all the copolymers had a single glass transition between -57 and -49 degreesC and a melting temperature in the range of 30.1-47.7 degreesC, both of which were correlated with the amount of DXO. An increase in the amount of DXO led to an increase in the glass-transition temperature and to a decrease in the melting temperature. Dynamic mechanical thermal analysis measurements confirmed the results of the calorimetric analysis, showing a single sharp drop in the storage modulus in the temperature region corresponding to the glass transition. Tensile testing demonstrated good mechanical properties with a tensile strength of 27-39 MPa and an elongation at break of up to 1400%. The morphology of the copolymers was examined with polarized optical microscopy and atomic force microscopy; the films that crystallized from the melt showed a short fibrillar structure (with a length of 0.05-0.4 mum) in contrast to the untreated solution-cast films. (C) 2003 Wiley Periodicals, Inc.
Subject headings
- TEKNIK OCH TEKNOLOGIER -- Annan teknik -- Övrig annan teknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Other Engineering and Technologies -- Other Engineering and Technologies not elsewhere specified (hsv//eng)
Keyword
- 1
- 5-dioxepan-2-one (DXO)
- poly(epsilon-caprolactone)
- thermal properties
- mechanical properties
- morphology
- RING-OPENING POLYMERIZATION
- Other technology
- Övriga teknikvetenskaper
Publication and Content Type
- ref (subject category)
- art (subject category)
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