CJCU

Chem. J. Chinese Universities ›› 2002, Vol. 23 ›› Issue (8): 1627.

• Articles • Previous Articles     Next Articles

Studies on Pre-melting and Crystallization Process of Biosynthesized Poly(3-hydroxybutyrate) Using Two-dimensional Fourier-transform Infrared Spectroscopy

TIANGe1, WU Qiong1, SUN Su-Qin2, NODA Isao3, CHEN Guo-Qiang1   

  1. 1. Department of Biological Sciences and Biotechnology, Beijing 100084, China;
    2. Analytical Center, Department of Chemistry, Tsinghua University, Beijing 100084, China;
    3. The Procter and Gamble Company, 8256 Union Centre Boulevard, West Chester, OH 45069, USA
  • Received:2001-05-09 Online:2002-08-24 Published:2002-08-24

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Abstract: The pre melting behavior and the crystallization process of bacterially synthesized polyester poly(3 hydroxybutyrate), abbreviated as the PHB, was investigated by generalized two dimensional Fourier Transform Infrared(2D FTIR) correlation spectroscopy. The temperature dependent dynamic spectra were measured from 25 to 220 ℃. The thermally induced intensity fluctuations of bands for C=O (1700-1770cm-1) and C-O-Cgroups (1230-1310cm-1) stretching vibrations were discussed. 2Dcorrelation analysis on changes of the crystalline and amorphous conformation indicated that the appearance of fully amorphous component did not accur simultaneously with the disappearance of crystalline component, suggesting that there is an intermediate state between the ordered crystalline and amorphous states in PHB, which may probably responsible for the band near 1730cm-1. Also the intermediate state was observed in the crystallization process of melted amorphous PHB.

Key words: Poly(3 hydroxybutyrate)(PHB), 2D FTIR, Pre melting process

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