The frustrated structure of poly(L-lactide)

J. Puiggali, Y. Ikada, H. Tsuji, L. Cartier, T. Okihara, B. Lotz

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239 Citations (Scopus)

Abstract

The crystal structure formed upon stretching or stroking of poly(L-lactide) is determined by electron diffraction and conformational energy analysis. It rests on a frustrated packing of three three-fold helices in a trigonal unit-cell of parameters a = b = 1.052 nm, c = 0.88 nm, space group P32. The frustrated packing is of the type described as North-South-South (NSS). This structure appears to be formed to accommodate the random up-down orientation of neighbor chains associated with rapid crystallization conditions. This randomness introduces structural disorder (c-axis shifts and azimuthal setting of neighbor helices). The resultant streaking of the diffraction pattern is modeled. Frustrated packings observed in polymeric systems that depart from three-fold symmetry, and in pseudo-racemates of low molecular weight compounds are discussed. (C) 2000 Elsevier Science Ltd.

Original languageEnglish
Pages (from-to)8921-8930
Number of pages10
JournalPolymer
Volume41
Issue number25
DOIs
Publication statusPublished - Sep 8 2000
Externally publishedYes

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Keywords

  • Crystal structure
  • Frustration
  • Polylactide

ASJC Scopus subject areas

  • Organic Chemistry
  • Polymers and Plastics
  • Materials Chemistry

Cite this

Puiggali, J., Ikada, Y., Tsuji, H., Cartier, L., Okihara, T., & Lotz, B. (2000). The frustrated structure of poly(L-lactide). Polymer, 41(25), 8921-8930. https://doi.org/10.1016/S0032-3861(00)00235-4