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    Grafting-from cellulose nanocrystals via photoinduced Cu-mediated reversible-deactivation radical polymerization

    Year: 2017

    Journal: Carbohydr. Polym., Volume 157, FEB 10, page 1033–1040

    Authors: Hatton, Fiona L.; Kedzior, Stephanie A.; Cranston, Emily D.; Carlmark, Anna

    Organizations: KTH Royal Institute of Technology; Natural Sciences and Engineering Research Council of Canada [RGPIN 402329]; Faculty of Engineering, McMaster University

    Keywords: Cellulose nanocrystals; Photoinduced polymerization; RDRP; Polymer-grafted CNC; Characterization; Nanoparticle compatibilization

    In this work we describe the grafting of cellulose nanocrystals (CNCs) by surface-initiated photoinduced Cu-mediated reversible-deactivation radical polymerization (RDRP). Initially, CNCs obtained through sulfuric acid hydrolysis were functionalized with a tertiary bromo-ester moiety as an initiating group for the subsequent RDRP of methyl acrylate, targeting three different degrees of polymerization for the polymer grafts: 50, 300 and 600. The polymerizations proceeded in DMSO in the presence of CuBr2 and Me6TREN as the catalytic system utilizing a UV source (lambda(max) approximate to 360 nm). The technique proved highly versatile for the modification of CNCs with poly(methyl acrylate), where considerably high grafting was achieved in short reaction times (90 min), with simple purification steps. CNC morphology was maintained and polymer grafts were evident through FT-IR spectroscopy, thermal analysis, contact angle measurements, X-ray photoelectron microscopy and x-ray diffraction. (C) 2016 Elsevier Ltd. All rights reserved.
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