Fiber and Polymer Technology, KTH Royal Institute of Technology, Teknikringen 56, SE-100 44 Stockholm, Sweden.
Fiber and Polymer Technology, KTH Royal Institute of Technology, Teknikringen 56, SE-100 44 Stockholm, Sweden.
Carbohydr Polym. 2017 Aug 15;170:254-263. doi: 10.1016/j.carbpol.2017.04.091. Epub 2017 Apr 28.
Two methods with different cross-linking mechanisms for designing hemicellulose-based full interpenetrating polymer networks (IPNs) were developed through the sequential synthesis of full IPNs from O-acetyl-galactoglucomannan (AcGGM) utilizing free-radical polymerization and a thiol-ene click reaction. A faster swelling rate was observed for all IPN formulations compared with the single-network gels. The highly porous structure of the IPNs with small interconnected pores was verified using scanning electron microscopy. A rheological analysis revealed that the AcGGM IPNs fabricated by the free-radical polymerization of acrylamide and N-N'-methylenebisacrylamide (cross-linker) had shear storage modulus (G') values approximately 5 and 2.5 times higher than that of the corresponding precursor single networks of AcGGM. IPNs achieved through thiol-ene reactions between thiolated AcGGM and polyethylene glycol diacrylate had G' values 35-40 times higher than the single-network reference hydrogels.
两种具有不同交联机制的方法被开发用于设计半纤维素基全互穿聚合物网络（IPN），方法是通过利用自由基聚合和硫醇-烯点击反应，从 O-乙酰基半乳糖甘露聚糖（AcGGM）顺序合成全 IPN。与单网络凝胶相比，所有 IPN 配方的溶胀速率都更快。通过扫描电子显微镜验证了 IPN 的高度多孔结构，具有小的互联孔。流变分析表明，通过丙烯酰胺和 N,N'-亚甲基双丙烯酰胺（交联剂）的自由基聚合制备的 AcGGM IPN 的剪切储能模量（G'）值比相应的 AcGGM 单网络前体高约 5 倍和 2.5 倍。通过巯基-烯反应在巯基化 AcGGM 和聚乙二醇二丙烯酸酯之间形成的 IPN 的 G'值比单网络参考水凝胶高 35-40 倍。
