Low-Temperature Processable Degradable Polyesters

Low-Temperature Processable Degradable Polyesters

Block copolymers composed of a low-T g and high-T g block, with suitable pressure miscibility characteristics, can be formed at low temperature through the application of pressure. Aliphatic block copolyesters composed of poly(ε-caprolactone) derivatives and poly(l-lactide) show room temperature pro...

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Veröffentlicht in:Macromolecules 2012-09, Vol.45 (18), p.7420-7428
Hauptverfasser: Taniguchi, Ikuo, Lovell, Nathan G
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Sprache:eng
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Applied sciences
Exact sciences and technology
Organic polymers
Physicochemistry of polymers
Polymers with particular properties
Preparation, kinetics, thermodynamics, mechanism and catalysts
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container_issue 18
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container_title Macromolecules
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creator Taniguchi, Ikuo
Lovell, Nathan G
description Block copolymers composed of a low-T g and high-T g block, with suitable pressure miscibility characteristics, can be formed at low temperature through the application of pressure. Aliphatic block copolyesters composed of poly(ε-caprolactone) derivatives and poly(l-lactide) show room temperature processability under hydraulic pressure of 34.5 MPa without polymer degradation. The mechanism of the pressure-induced flow is investigated by small-angle X-ray scattering. A scattering associated with a lamellae structure observed at ambient conditions decreases with elevating hydrostatic pressures, indicating pressure-induced phase mixing. Traces of the pressure-induced phase transition are studied by differential scanning calorimetry and X-ray diffraction. Tensile test of the block copolymers reveals that the mechanical properties can be readily controlled by changing composition, molecular weight, and chemical structure of the blocks. Among them, the hard segment PLLA fraction is the key factor to characterize the properties. Young’s modulus of the block copolyesters is similar to that of polyethylene.
doi_str_mv 10.1021/ma301230y
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source American Chemical Society Journals
subjects Applied sciences
Exact sciences and technology
Organic polymers
Physicochemistry of polymers
Polymers with particular properties
Preparation, kinetics, thermodynamics, mechanism and catalysts
title Low-Temperature Processable Degradable Polyesters
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