期刊
MACROMOLECULES
卷 50, 期 13, 页码 5074-5079出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.macromol.7b00753
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资金
- Special Coordination Fund for the Promotion of Science and Technology
- Creation of Innovation Centers for Advanced Interdisciplinary Research Areas (Innovative Bioproduction Kobe), MEXT, Japan
Elastic modulus of the crystalline regions (crystal modulus) of poly(glycolic acid) (PGA) in the directions parallel (E-l) and perpendicular (E-t) to the chain axis was measured by X-ray diffraction. The E-l value of PGA was 104 GPa at room temperature. This relatively low E-l value suggests that the PGA skeleton is not fully extended as reported before but contracted. The E-t value of PGA was obtained as 7 GPa, which resembles that (7 GPa) of poly(vinyl alcohol) based on intermolecular hydrogen bonds. This reveals strong intermolecular interactions act between PGA molecules in the crystal lattice. Both low E-l value and high E-t value are considered to contribute to the extraordinarily high melting point (223 degrees C) of PGA among aliphatic polyesters. Temperature dependence (13-400 K) of both E-l and E-t of PGA was also investigated. Abrupt changes around 200 K for both directions were considered to be caused by molecular motion in the crystalline regions of PGA.
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