Naslov
Degradation behavior of hydrogels from poly(vinyl alcohol)-graft-[poly(rac-lactide)/poly(rac- lactide-co-glycolide)]: Influence of the structure and composition on the material's stability

Autori
Vidović, Elvira ; Klee, Doris ; Höcker, Hartwig

Izvornik
Journal of applied polymer science (0021-8995) 112 (2009), 3; 1538-1545

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
degradation ; hydrogels ; polyesters

Sažetak
The swellability and mass loss of poly(vinyl alcohol)-graft-[poly(rac-lactide)/poly(rac- lactide-co-glycolide)] hydrogels upon hydrolysis are strongly affected by the composition of the hydrogels. Hydrophobic hydrogels remain at a relatively constant mass for a couple of weeks, and the mass decreases dramatically thereafter, whereas more hydrophilic hydrogels lose mass right from the beginning. All hydrogels display water uptake values between 90 and 280% within 8 weeks. For longer periods of degradation, the water uptake increases up to a maximum of about 900%. Studies of the thermal properties of samples upon degradation and their IR measurements have shown that the degradation rate is related to the physical and chemical structure of the hydrogels and hence to the hydrophobic/hydrophilic balance ; that is, the degradation increases with the increasing hydrophilicity of the material. As a result, degradation can be engineered through the variation of the composition and structure of the material.

Izvorni jezik
Engleski

Znanstvena područja
Kemijsko inženjerstvo

Napomena
Glavni autori: Elvira Vidović i Hartwig Höcker

POVEZANOST RADA