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Preparation of photoreactive nanocellulosic materials via benzophenone grafting

机译:二苯甲酮接枝制备光反应性纳米纤维素材料

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摘要

A method for preparing photo-crosslinkable cellulose nanofibrils (CNF) was investigated. Benzophenone (BP), a UV-radical crosslinker, was chemically grafted to TEMPO-oxidized wood fibers in water/DMSO medium. This resulted in a reduction of carboxyl group content together with an increase of the number density of amide linkages. The BP-functionalized fibres were then microfluidized into TEMPO-oxidized CNF (TOCNF). As evidence of the crosslinking performance, the films of BP-activated TOCNF displayed improved water resistance upon UV curing (even under high energy sonication). In addition to improving wet strength the method is suitable for further modification of CNF, either by utilizing the remaining free carboxyl groups or via photochemical grafting of other substances onto the CNF structure.
机译:研究了一种可光交联的纤维素纳米原纤维(CNF)的制备方法。在水/ DMSO介质中,将紫外线自由基交联剂苯甲酮(BP)化学接枝到TEMPO氧化的木纤维上。这导致羧基含量的减少以及酰胺键的数目密度的增加。然后将BP官能化的纤维微流化成TEMPO氧化的CNF(TOCNF)。作为交联性能的证据,BP活化的TOCNF薄膜在UV固化后(即使在高能超声处理下)显示出改善的耐水性。除了提高湿强度之外,该方法还适合于通过利用剩余的游离羧基或通过将其他物质光化学接枝到CNF结构上来进一步修饰CNF。

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