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Titolo:
Enzymatic degradation of blends of poly (epsilon-caprolactone) and poly(styrene-co-acrylonitrile) by Pseudomonas lipase
Autore:
Cho, K; Lee, J; Xing, PX;
Indirizzi:
Pohang Univ Sci & Technol, Sch Environm Engn, Dept Chem Engn, Pohang 790784, South Korea Pohang Univ Sci & Technol Pohang South Korea 790784 790784, South Korea Pohang Univ Sci & Technol, Sch Environm Engn, Div Elect & Comp Engn, Polymer Res Inst, Pohang 790784, South Korea Pohang Univ Sci & Technol Pohang South Korea 790784 790784, South Korea
Titolo Testata:
JOURNAL OF APPLIED POLYMER SCIENCE
fascicolo: 4, volume: 83, anno: 2002,
pagine: 868 - 879
SICI:
0021-8995(20020124)83:4<868:EDOBOP>2.0.ZU;2-T
Fonte:
ISI
Lingua:
ENG
Soggetto:
SOLID-STATE STRUCTURES; ANGLE X-RAY; POLY(EPSILON-CAPROLACTONE); POLY(3-HYDROXYBUTYRATE); BIODEGRADABILITY; ACID); POLY(3-HYDROXYBUTYRATE-CO-3-HYDROXYVALERATE); SEMICRYSTALLINE; CRYSTALLIZATION; POLYETHYLENE;
Keywords:
enzymatic degradation; biodegradation; blend; poly(epsilon-caprolactone); poly(styrene-co-acrylonitrile); surface property;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Engineering, Computing & Technology
Citazioni:
42
Recensione:
Indirizzi per estratti:
Indirizzo: Cho, K Pohang Univ Sci & Technol, Sch Environm Engn, Dept Chem Engn, Pohang 790784, South Korea Pohang Univ Sci & Technol Pohang South Korea 790784, South Korea
Citazione:
K. Cho et al., "Enzymatic degradation of blends of poly (epsilon-caprolactone) and poly(styrene-co-acrylonitrile) by Pseudomonas lipase", J APPL POLY, 83(4), 2002, pp. 868-879

Abstract

In polymer blends, the composition and microcrystalline structure of the blend near surfaces can be markedly different from the bulk properties. In this study, the enzymatic degradation of poly(epsilon -caprolactone) (PCL) and its blends with poly(styrene-co-acrylonitrile) (SAN) was conducted in a phosphate buffer solution containing Pseudomonas lipase, and the degradation behavior was correlated with the surface properties and crystalline microstructure of the blends. The enzymatic degradation preferentially took place at the amorphous part of PCL film. The melt-quenched PCL film with low crystallinity and small lamellar thickness showed a higher degradation rate compared with isothermally crystallized (at 36, 40, and 44 degreesC) PCL films. Also, there was a vast difference in the enzymatic degradation behaviorof pure PCL and PCL/SAN blends. The pure PCL showed 100% weight loss in a very short time (i.e., 72 h), whereas the PCL/SAN blend containing just 1% SAN showed similar to 50% weight loss and the degradation ceased, and the blend containing 40% SAN showed almost no weight loss. These results suggestthat as degradation proceeds, the nondegradable SAN content increases at the surface of PCL/SAN films and prevents the lipase from attacking the biodegradable PCL chains. This phenomenon was observed even for a very high PCLcontent in the blend samples. In the blend with low PCL content, the inaccessibility of the amorphous interphase with high SAN content prevented the attack of lipase on the lamellae of PCL. (C) 2002 John Wiley & Sons, Inc, JAppl Polym Sci 83: 868-879, 2002.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 05/04/20 alle ore 04:01:47