We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
UV-Induced [2+2] Grafting-To Reactions for Polymer Modification of Cellulose.
- Authors
Conradi, Matthias; Ramakers, Gijs; Junkers, Thomas
- Abstract
Benzaldehyde-functional cellulose paper sheets have been synthesized via tosylation of cellulose (Whatman No 5) followed by addition of p-hydroxy benzaldehyde. Via UV-induced Paterno-Büchi [2+2] cycloaddition reactions, these aldehyde functional surfaces are grafted with triallylcyanurate, trimethylolpropane allyl ether, and vinyl chloroacetate. In the following, allyl-functional polymers (poly(butyl acrylate), pBA, Mn = 6990 g mol−1, Đ = 1.12 and poly( N-isopropyl acrylamide), pNIPAAm, Mn = 9500 g mol−1, Đ = 1.16) synthesized via reversible addition fragmentation chain transfer polymerization are conjugated to the celloluse surface in a UV-induced grafting-to approach. With pBA, hydrophobic cellulose sheets are obtained (water contact angle 116°), while grafting of pNIPAAm allows for generation of 'smart' surfaces, which are hydrophilic at room temperature, but that become hydrophobic when heated above the characteristic lower critical solution temperature (93° contact angle). The Paterno-Büchi reaction has been shown to be a versatile synthetic tool that also performs well in grafting-to approaches whereby its overall performance seems to be close to that of radical thiol-ene reactions.
- Subjects
POLYMER research; MACROMOLECULES; DEPOLYMERIZATION; CELLULOSE; GLUCANS
- Publication
Macromolecular Rapid Communications, 2016, Vol 37, Issue 2, p174
- ISSN
1022-1336
- Publication type
Article
- DOI
10.1002/marc.201500484