Biodegradable Polymers from Renewable Sources: Rheological Characterization of Hemicellulose-Based Hydrogels

详细信息    查看全文

• 作者：Margaretha Sö ; derqvist Lindblad ; Ann-Christine Albertsson ; Elisabetta Ranucci ; Michele Laus ; and Elena Giani
• 刊名：Biomacromolecules
• 出版年：2005
• 出版时间：March 2005
• 年：2005
• 卷：6
• 期：2
• 页码：684 - 690
• 全文大小：114K
• 年卷期：v.6,no.2(March 2005)
• ISSN：1526-4602

文摘

Hemicellulose-based hydrogels were prepared by radical polymerization of 2-hydroxyethyl methacrylate orpoly(ethylene glycol) dimethacrylate with oligomeric hydrosoluble hemicellulose modified with well-definedamounts of methacrylic functions. The polymerization reaction was carried out in water at 40 s/entities/deg.gif">C using aredox initiator system. The hydrogels were in general elastic, soft, and easily swellable in water. Theirviscoelastic properties were determined by oscillatory shear measurements on 2 mm thick hydrogels undera slight compression to avoid slip, over the frequency range 10^-1 to 10². The rheological characterizationindicated that the elastic response of the hydrogels was stronger than the viscous response, leading to theconclusion that the hydrogel systems displayed a predominantly solidlike behavior. The curves showed anincrease in shear storage modulus with increasing cross-linking density. The nature of the synthetic comonomerin 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 wererather similar, demonstrating that the synthetic procedure made it possible to prepare hemicellulose-basedhydrogels with properties similar to those of pure poly(2-hydroxyethyl methacrylate) hydrogels.