Preparation, structure analysis and enzymatic degradation of poly [(R)-3-hydroxybutyrate-co-(R)-3-hydroxyhexanoate] gel-films

Taizo Kabe, Toshihisa Tanaka, Ken Ichi Kasuya, Kazuki Ito, Masaki Takata, Akio Takemura, Tadahisa Iwata

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4 Citations (Scopus)


Gel-films of poly[(R)-3-hydroxybutyrate-co-(R)-3-hydroxyhexanoate] (P(3HB-co-3HH)) with 12 mol% 3HH comonomer were prepared from a dilute solution of 1,2-dichloroethane by rapid quenching and slow drying. Uniaxial drawings were applied to the gel-films at room temperature. The gel-films were possible to stretch up to 8 times, leading to enhancements of the mechanical properties. The tensile strength, Young's modulus, and elongation to break of 8 times drawn gel-film were 151 MPa, 0.21 GPa, and 58 %, respectively. The orientation of lamella crystals in gel-films and drawn gel-films were analyzed by wide-angle and small-angle X-ray diffraction. In the drawn gel-films, a planer zigzag conformation consisting of extended molecular chains was observed. Furthermore, the lamella crystals in drawn gel-film were revealed to orient two directions, which are parallel and perpendicular to the film surface. It was indicated that a part of the oriented lamella crystal parallel to film surface rotated in the direction of perpendicular to the film surface during drawing of the gel-film. The drawings of gel-films accelerated the rate of enzymatic degradation by PHB depolymerase. The result was explained that the planer zigzag conformation in the drawn gel-films was easier to be broken down by the enzyme than the lamella crystals.

Original languageEnglish
Pages (from-to)253-260
Number of pages8
JournalJournal of Fiber Science and Technology
Issue number10
Publication statusPublished - 2010 Oct
Externally publishedYes

ASJC Scopus subject areas

  • Chemical Engineering (miscellaneous)
  • Materials Science (miscellaneous)
  • Polymers and Plastics
  • Industrial and Manufacturing Engineering


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