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Morphological study of bacterial poly(3‐hydroxybutyrate‐ co ‐3‐hydroxypropionate)
Author(s) -
Ichikawa Masafumi,
Nakamura Kazuhiro,
Yoshie Naoko,
Asakawa Naoki,
Inoue Yoshio,
Doi Yoshiharu
Publication year - 1996
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.1996.021970811
Subject(s) - crystallinity , spherulite (polymer physics) , differential scanning calorimetry , materials science , copolymer , copolyester , carbon 13 nmr , polymer chemistry , crystal structure , crystallography , solid state , diffraction , polymer , chemical engineering , chemistry , stereochemistry , composite material , optics , physics , polyester , thermodynamics , engineering
The solid‐state structure of a bacterially synthesized copolyester, poly(3‐hydroxybutyrate‐ co ‐3‐hydroxypropionate), P(3HB‐ co ‐3HP), with the 3HP content ranging from 0 to 37 mol‐%, was analyzed by 13 C solid‐state high‐resolution NMR, X‐ray diffraction, differential scanning calorimetry and optical microscopy. For the copolymers containing up to about 40 mol‐% 3HP, it was confirmed from the X‐ray diffraction measurement that the crystallographic parameters are similar to those of P(3HB) homopolymer and the degree of crystallinity decreases as the 3HP content increases. From the measurement of 13 C spin‐lattice relaxtion time ( T 1 c ) using solid‐state high‐resolution 13 C NMR, it was concluded that the crystalline region is composed only of 3HB units, suggesting that the cocrystallization of 3HB and 3HB units in the same crystal lattice does not occur in P(3HB‐ co ‐3HP). This conclusion is supported by the thermal properties and the rate of spherulite growth.