Crystalline structure and morphology of poly(L-lactide) Formed under high-pressure CO2

Hironori Marubayashi, Satoshi Akaishi, Shuichi Akasaka, Shigeo Asai, Masao Sumita

Research output: Contribution to journalArticlepeer-review

117 Citations (Scopus)

Abstract

Crystalline structure and morphology of poly(L-lactide) (PLLA) formed under high-pressure CO2 were studied by comparing the C0 2-treated PLLA and the annealed one in terms of the crystallization behavior, crystalline forms, and crystalline superstructures. The crystallization temperature dependence of the diffraction peak position (2θ-16°) and crystallinity for the C02-treated PLLA indicates that the crystal modification changes continuously from the disorder α (α ) to a forms not through the a one with increasing temperature. By using light scattering technique, we clarified that the morphological transition from spherulites on a micrometer scale to rodlike crystalline superstructures on a nanometer scale occurs around 15 °C under 7-15 MPa CO2 and around 30 °C under 3 MPa CO2. By introducing the parameters Ν and A in the theoretical calculation for Vv light scattering from spherulites, it is indicated that there is a distinct difference in the arrangement of crystalline lamellae within spherulite between the C0 2-treated PLLA and the annealed one.

Original languageEnglish
Pages (from-to)9192-9203
Number of pages12
JournalMacromolecules
Volume41
Issue number23
DOIs
Publication statusPublished - 2008 Dec 9
Externally publishedYes

ASJC Scopus subject areas

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

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