期刊
MACROMOLECULES
卷 45, 期 3, 页码 1384-1397出版社
AMER CHEMICAL SOC
DOI: 10.1021/ma202324g
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资金
- Tokyo Institute of Technology Education and Research Center for Emergence of New Molecular Chemistry
- Japan Society for the Promotion of Science [22008912]
- Grants-in-Aid for Scientific Research [10J08912] Funding Source: KAKEN
By screening examinations for a wide variety of organic solvents, we found that poly(L-lactide)(PLLA) forms the crystalline complex (epsilon-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 e-crystals. By fiber diagram analyses for the epsilon-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 alpha = beta = gamma = 90 degrees). 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 m the-unit cell.
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