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Accession number;03A0820489
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| Title;Pyrolysis products of bacterial synthesized poly(3-hydorxybutyrate-co-3-hydroxyvalerate). |
| Author;
ITO TAKESHI
(Ind. Res. Inst. of Nagano)
SAITO NORIHIRO
(Ind. Res. Inst. of Nagano)
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Journal Title;Naganoken Kogyo Shikenjo Kenkyu Hokoku
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Journal Code:Y0010A
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ISSN:0913-672X
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VOL.;NO.23;PAGE.26-28(2003)
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| Figure&Table&Reference;FIG.3, TBL.2, REF.4 |
| Pub. Country;Japan |
| Language;Japanese |
| Abstract;Among many kinds of biodegradable polymers, poly(3-hydroxybutyrate-co-3-hydroxyvalerate)s synthesized by microorganisms are extensively studied thermoplastic materials for industrial purposes. To look for one of the clues to evaluate the biodegradability of the polymers, an analytical pyrolysis was performed by means of pyrolysis-gaschromatography/mass spectrometry. Cis- and/or trans- crotonic acids correspond to the monomeric unit of the polymers were the main products. 2-pentenoic acids derived from 3-hydroxyvalerate segments were also detected. Although dimeric products were found, higher oligomers were absence in the total ion chromatogram. Two distinctive tributyrate derivatives supposed to be formed by radical couplings of thermally generated species appeared as sharp peaks in the chromatogram. The thermolysis of the copolymer presumably initiates by the elimination of protons adjacent to carbonyl groups, subsequent .BETA.-scission generate the enolates and the carboxyl radicals. (author abst.) |
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