Low-temperature processable degradable polyesters

Ikuo Taniguchi, Nathan G. Lovell

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)7420-7428
Number of pages9
JournalMacromolecules
Volume45
Issue number18
DOIs
Publication statusPublished - Sep 25 2012
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Organic Chemistry
  • Polymers and Plastics
  • Inorganic Chemistry
  • Materials Chemistry

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