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Designing biodegradable multiblock PCL/PLA thermoplastic elastomers

Paper ID Volume ID Publish Year Pages File Format Full-Text
12796 818 2005 9 PDF Available
Title
Designing biodegradable multiblock PCL/PLA thermoplastic elastomers
Abstract

A series of poly(ε-caprolactone)/poly(L-lactic acid) (PCL/PLA) biodegradable poly(ester-urethane)s, was synthesized and characterized. The first step of the synthesis consisted of the ring opening polymerization of L-lactide, initiated by the hydroxyl terminal groups of the PCL chain, followed by the chain extension of these PLA-PCL-PLA triblocks, using hexamethylene diisocyanate (HDI). The trimers comprised PCL2000 flexible segments, while the length of each PLA block covered the 550–6000 molecular weight range. The morphology of the copolymers gradually changed, as the length of the PLA blocks increased. The multiblock copolymers produced displayed enhanced mechanical properties, with ultimate tensile strength values around 32 MPa, Young's modulus as low as 30 MPa and elongation at break values well above 600%. The longer the PLA block, the slower the in vitro degradation of the material, with all copolymers degrading faster than the respective homopolymers.

Keywords
Poly(caprolactone); Poly(lactic acid); Biodegradation; Elastomer; Copolymer
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Designing biodegradable multiblock PCL/PLA thermoplastic elastomers
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Publisher
Database: Elsevier - ScienceDirect
Journal: Biomaterials - Volume 26, Issue 15, May 2005, Pages 2297–2305
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
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