Complex crystal formation of poly(l -lactide) with solvent molecules

Hironori Marubayashi, Shigeo Asai, Masao Sumita

Research output: Contribution to journalArticlepeer-review

126 Citations (Scopus)


By screening examinations for a wide variety of organic solvents, we found that poly(l-lactide) (PLLA) forms the crystalline complex (ε-form) with the specific organic solvents such as tetrahydrofuran (THF) and N,N-dimethylformamide (DMF) below room temperature. It was revealed that PLLA has high selectivity for low molecular weight compounds to form the ε-crystals. By fiber diagram analyses for the ε-forms, it was found that PLLA chains take the 10 7 (left-handed 10 3) helical conformation and are packed in the orthorhombic lattice (a = 1.5-1.6 nm, b = 1.2-1.3 nm, c = 2.8-2.9 nm, and α = β = γ = 90°). Based on R-factor and packing energy calculations, the plausible crystal structure of PLLA-DMF complex was proposed, in which four PLLA chains and eight guest solvents are packed in the unit cell.

Original languageEnglish
Pages (from-to)1384-1397
Number of pages14
Issue number3
Publication statusPublished - 2012 Feb 14
Externally publishedYes

ASJC Scopus subject areas

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


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