Changes in composition of hydrolyzed poly(butylene adipate-co-caproamide) characterized by pyrolysis-GC-MS, H-1-NMR and FTIR
2000 (English)In: IJPAC. International journal of polymer analysis and characterization, ISSN 1023-666X, E-ISSN 1563-5341, Vol. 5, no 06-apr, 415-435 p.Article in journal (Refereed) Published
The changes in composition of an abiotically degraded polyester-amide, poly(butylene adipate-co-caproamide), in an aqueous environment at 37 degrees C; 60 degrees C and 80 degrees C were investigated. The changes in polymer composition were studied using pyrolysis-GC-MS, H-1-NMR, FTIR, and size exclusion chromatography, and degradation products were analyzed by solid-phase extraction and subsequent GC-MS. During the degradation of PEA in an aqueous environment, the main degradation products were 6-aminohexanoic acid, 1-hydroxydodecanoic acid-6-one-5-oxo and dimers. After longer degradation times and at higher degradation temperatures, 1-hydroxydodecanoic acid-6-one-5-oxo was cleaved further into hexanedioic acid and 1,4-butanediol. At 80 degrees C, the degradation was fastest with the largest weight loss due to dissolution of oligomer. At 80 degrees C, the amide content in the copolymer increased with increasing degradation time. We suggest that there is a two-step degradation mechanism with the formation of linear degradation products, where the hydrolysis of ester bonds is favored over that of amide bonds.
Place, publisher, year, edition, pages
2000. Vol. 5, no 06-apr, 415-435 p.
polyester-amide, hydrolysis, degradation, pyrolysis, degradation products, theoretical prediction, aliphatic polyesters, molecular-weight, degradation, biodegradabilities, acid
IdentifiersURN: urn:nbn:se:kth:diva-19821ISI: 000087567300008OAI: oai:DiVA.org:kth-19821DiVA: diva2:338513
QC 201005252010-08-102010-08-10Bibliographically approved