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| Naji, M. |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Petrov, R. H. | Madrid |
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| Azam, Siraj |
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| Azevedo, Nuno Monteiro |
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Martello, Mark T.
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Topics
Publications (5/5 displayed)
- 2015Poly(lactide)-block-poly(ε-caprolactone-co-ε-decalactone)-block-poly(lactide) copolymer elastomerscitations
- 2014Synthesis and melt processing of sustainable poly(ε-decalactone)-block-poly(lactide) multiblock thermoplastic elastomerscitations
- 2012Bulk ring-opening transesterification polymerization of the renewable δ-decalactone using an organocatalystcitations
- 2011Functional biorenewable polyesters from carvone-derived lactonescitations
- 2011Pressure-sensitive adhesives from renewable triblock copolymerscitations
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article
Synthesis and melt processing of sustainable poly(ε-decalactone)-block-poly(lactide) multiblock thermoplastic elastomers
Abstract
<p>A one-pot, one-catalyst, sequential ring-opening transesterification polymerization (ROTEP) was used to prepare fully renewable amorphous poly(d,l-lactide)-poly(ε-decalactone)-poly(d,l-lactide) (LDL) triblock polymers. These α,ω hydroxy-telechelic polymers were subsequently coupled to prepare linear alternating (LDL)<sub>n</sub> multiblock polymers. Differential scanning calorimetry (DSC) and small-angle X-ray scattering (SAXS) indicated microphase separation into two domains in both the triblock and multiblock architectures. The temperature dependent Flory-Huggins interaction parameter for this system, X(T) = 69.1/T - 0.072, was estimated from the experimentally determined order-disorder transition temperature (T<sub>ODT</sub>) values of four symmetric LDL triblock polymers. Uniaxial extension tests revealed a dramatic dependence of the room-temperature mechanical properties on overall molar mass. Additionally, coupling low molar mass LDL triblocks to prepare (LDL)<sub>n</sub> multiblocks led to substantial increases in the ultimate elongation and tensile stress at break. Compared to high molar mass triblocks with inaccessible T<sub>ODT</sub> values, (LDL)<sub>n</sub> multiblocks of similar composition and molar mass were found to disorder at much lower temperatures (T<sub>ODT</sub> < 150 °C). Because of this, it was possible to process (LDL)<sub>n</sub> using injection molding. The simple synthetic procedure and melt processability of the (LDL)<sub>n</sub> multiblock polymers make these multiblocks attractive as renewable thermoplastic elastomers (TPEs).</p>