Biodegradable polymers from renewable sources: Rheological characterization of hemicellulose-based hydrogels
2005 (English)In: Biomacromolecules, ISSN 1525-7797, E-ISSN 1526-4602, Vol. 6, no 2, 684-690 p.Article in journal (Refereed) Published
Hemicellulose-based hydrogels were prepared by radical polymerization of 2-hydroxyethyl methacrylate or poly(ethylene glycol) dimethacrylate with oligomeric hydrosoluble hemicellulose modified with well-defined amounts of methacrylic functions. The polymerization reaction was carried out in water at 40 degrees C using a redox initiator system. The hydrogels were in general elastic, soft, and easily swellable in water. Their viscoelastic properties were determined by oscillatory shear measurements on 2 mm thick hydrogels under a slight compression to avoid slip, over the frequency range 10(-1) to 10(2). The rheological characterization indicated that the elastic response of the hydrogels was stronger than the viscous response, leading to the conclusion that the hydrogel systems displayed a predominantly solidlike behavior. The curves showed an increase in shear storage modulus with increasing cross-linking density. The nature of the synthetic comonomer in the hemicellulose-based hydrogels also influenced the shear storage modulus. Comparison of hemicellulose-based hydrogels with pure poly(2-hydroxyethyl methacrylate) hydrogels showed that their behaviors were rather similar, demonstrating that the synthetic procedure made it possible to prepare hemicellulose-based hydrogels with properties similar to those of pure poly(2-hydroxyethyl methacrylate) hydrogels.
Place, publisher, year, edition, pages
2005. Vol. 6, no 2, 684-690 p.
dynamic-mechanical analysis, wood
IdentifiersURN: urn:nbn:se:kth:diva-14606DOI: 10.1021/bm049515zISI: 000227687800023ScopusID: 2-s2.0-16344371759OAI: oai:DiVA.org:kth-14606DiVA: diva2:332647
QC 201005252010-08-052010-08-05Bibliographically approved