期刊
POLYMER CHEMISTRY
卷 6, 期 19, 页码 3641-3651出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5py00202h
关键词
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资金
- E.I. DuPont de Nemours Co.
- Dow Chemical Company
- U.S. National Science Foundation [DMR-9304725]
- State of Illinois through the Department of Commerce
- Board of Higher Education [IBHE HECA NWU 96]
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-AC02-06CH11357]
- NSF through the National Nanotechnology Infrastructure Network program
- University of Minnesota's Undergraduate Research Opportunities Program
Batch ring opening transesterification copolymerization of epsilon-caprolactone and epsilon-decalactone was used to generate statistical copolymers over a wide range of compositions and molar masses. Reactivity ratios determined for this monomer pair, r(CL) = 5.9 and r(DL) = 0.03, reveal epsilon-caprolactone is added preferentially regardless of the propagating chain end. Relative to poly(epsilon-caprolactone) the crystallinity and melting point of these statistical copolymers were depressed by the addition of epsilon-decalactone; copolymers containing greater than 31 mol% (46 wt%) epsilon-decalactone were amorphous. Poly(lactide)-block-poly(epsilon-capro-lactone-co-epsilon-decalactone)-block-poly(lactide) triblock polymers were also prepared and used to explore the influence of midblock composition on the temperature dependent Flory-Huggins interaction parameter (chi). In addition, uniaxial extension tests were used to determine the effects of midblock composition, poly(lactide) content, and molar mass on the mechanical properties of these new elastomeric triblocks.
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