School of Chemistry, Chemical Engineering and Life Sciences, Wuhan University of Technology, Wuhan 430070, PR China.
Guangxi Key Laboratory of Polysaccharide Materials and Modification, School of Chemistry and Chemical Engineering, Guangxi University for Nationalities, Nanning 530008, Guangxi, PR China.
Int J Biol Macromol. 2020 May 1;150:756-764. doi: 10.1016/j.ijbiomac.2020.02.125. Epub 2020 Feb 13.
Incompatibility of chitin nanomaterials with organic solvents is challenging in the design of the desirable organogels. The long hydrocarbon chains were covalently grafted on the surface of nanochitins, with the attachment of reactive allyl groups and improved dispersion in organic solvents. The reactive thiol groups of poly (ethylene glycol) were introduced into the allyl-nanochitin suspensions to produce the organogels by the thiol-ene click reaction. Attributed to the UV-induced cross-linking between the soft segments of thiolated-PEG and the allyl-nanochitin, the stable organogels with the storage modulus higher than the loss modulus by one order of magnitude were obtained, exhibiting the significant phase transition and mechanical enhancement on the rheological behavior. The combination of crystalline allyl-nanochitin and polymeric chains played a crucial role in the construction of the micro-network, attributing to the stability and mechanical strength of the organogels.
壳聚糖纳米材料与有机溶剂的不相容性给理想的有机凝胶的设计带来了挑战。长的烃链通过共价键接枝在纳米壳聚糖表面上，并带有反应性烯丙基基团，从而改善了在有机溶剂中的分散性。将聚乙二醇的反应性巯基引入到烯丙基-纳米壳聚糖悬浮液中，通过硫醇-烯点击反应生成有机凝胶。由于硫醇化聚乙二醇的软段之间的 UV 诱导交联以及与烯丙基-纳米壳聚糖之间的交联，得到了具有存储模量比损耗模量高一个数量级的稳定有机凝胶，表现出显著的相转变和流变行为的机械增强。结晶性烯丙基纳米壳聚糖和聚合链的结合在微网络的构建中起着关键作用，这归因于有机凝胶的稳定性和机械强度。
