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Effect of Comonomer‐Unit Compositional Distribution on Thermal and Crystallization Behavior of Bacterial Poly[(3‐hydroxybutyrate)‐ co ‐(3‐mercaptopropionate)]
Author(s) -
Yu Fang,
Zhu Bo,
Dong Tungalag,
Inoue Yoshio
Publication year - 2009
Publication title -
macromolecular bioscience
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.924
H-Index - 105
eISSN - 1616-5195
pISSN - 1616-5187
DOI - 10.1002/mabi.200800305
Subject(s) - comonomer , crystallization , solvent , chemistry , fractionation , analytical chemistry (journal) , heptane , materials science , chromatography , monomer , polymer , organic chemistry
The physical properties of novel sulfur‐containing biopolymers, poly[(3‐hydroxybutyrate)‐ co ‐(3‐mercaptopropionate)]s [P(3HB‐ co ‐3MP)s], have been investigated in detail by 1 H and 13 C NMR spectroscopy, wide‐angle X‐ray diffraction (WAXD) analysis, DSC, and FT‐IR spectroscopy. Based on a solvent/non‐solvent (chloroform/heptane) fractionation method, an original P(3HB‐ co ‐3MP) sample with 3MP unit content of 16.3 mol‐% was fractionated into eight fractions with 3MP unit content ranging from 10.3 to 37.2 mol‐% and number‐average molecular weight from 0.4 × 10 5 to 2.9 × 10 5 . The thermal and crystallization behavior were found to be greatly affected by the comonomer‐unit composition and its distribution. Furthermore, the 3MP comonomer unit was found to be included in the crystalline phase in some fractions.