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[RSC Adv.] Direct functionalization of cellulose nanocrystals with polymer brushes via UV-induced polymerization: access to novel heterogeneous visible-light photocatalysts  
[RSC Adv.] Direct functionalization of cellulose nanocrystals with polymer brushes via UV-induced polymerization: access to novel heterogeneous visible-light photocatalysts
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关键词: polymer  brushes  cellulose  nanocrystals  UV-induced  photopolymerizations  
资料大小: 862k
所属学科: 高分子化学
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简介:
Cellulose nanocrystals (CNCs) are an exciting class of bio-based materials attracting increasing interest for a wide range of potential applications due to their nanoscale dimensions, biocompatibility, biodegradability and large surface area. In this work, we report a universal and facile strategy for the preparation of polymer brushes on CNCs via photopolymerization in the absence of any initiator immobilization. The reported procedure is applicable to a series of vinyl monomers, leading to the direct creation of homogeneous and stable polymer coatings on CNCs. Characterization of the resulting polymer-grafted CNCs by FTIR spectroscopy, XRD, AFM and TGA indicates a high grafting density, enhanced dispersing ability and thermal stability without altering the crystalline structure of the intrinsic CNCs. Finally, we have demonstrated the possibility to covalently attach 4,4-di?uoro-4-bora-3a,4a-diaza-s-indacene to the grafted polymer chain ends through polymer analogous reactions. The a?orded nano-objects show visible-light photocatalytic activity and chemoselectivity in the oxidization reaction of thioanisole to methyl phenyl sulfoxide.
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