Effect of Cyclodextrins on th Degradation of Polyesters.
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Accession number;99A0228231
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| Title;Effect of Cyclodextrins on th Degradation of Polyesters. |
| Author;
KAWAGUCHI YOSHINORI
(Osaka Univ., Grad. Sch.)
NISHIYAMA TOSHIYUKI
(Osaka Univ., Grad. Sch.)
OKADA MIYUKO
(Osaka Univ., Grad. Sch.)
KAMACHI MIKIHARU
(Fukui Inst. of Technol.)
HARADA AKIRA
(Osaka Univ., Grad. Sch.)
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Journal Title;Abstracts. Symposium on Biofunctional Chemistry
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Journal Code:L0836A
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ISSN:
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VOL.13th;NO.;PAGE.127-129(1998)
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| Figure&Table&Reference; |
| Pub. Country;Japan |
| Language;Japanese |
| Abstract;Previously, we reported that cyclodextrins(CDs) form inclusion complexes with various polymers. Here, we report that aliphatic polyesters, such as poly(.EPSILON.-caprolactone)(PEC), poly(ethylene adipate)(PEA), poly(1,3-trimethylene adipate)(PTA), and poly(1,4-butylene adipate)(PBA), form inclusion complexes with CDs to give crystalline compounds, and these polyesters included in CDs were hydrolyzed in alkaline conditions much faster than the polyesters only. These all polyesters were formed inclusion complexes with .ALPHA.- and .GAMMA.-CD in high yields and .BETA.-CD in moderate yields. We proposed that the structures of .ALPHA.- and .BETA.-CD inclusion complexes are similar to that of .ALPHA.-CD-poly(ethylene glycol) complex, in which many CDs form channel structure including a polymer chain, and .GAMMA.-CD inclusion complexes are similar to that of .GAMMA.-CD-modified poly(ethylene glycol) complex, in which many CDs form channel structure including two polymer chains. Hydrolysis of these polyesters were carried out in alkaline aqueous solutions at fixed temperature, and detected by GPC, after neutralization by HCl aq. and extraction of reaction products by THF. These polyesters included in CDs were hydrolyzed much faster than the polyesters without CDs. The acceleration was not observed at the mixture systems of polyesters-CD and polyesters-linear models. So, the acceleration was caused by the pseudo-polyrotaxane structure of CDs-polyesters inclusion complexes. (author abst.) |
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