SET-LRP Goes "Green": Various Hemicellulose Initiating Systems Under Non-Inert Conditions
2012 (English)In: Journal of Polymer Science Part A: Polymer Chemistry, ISSN 0887-624X, E-ISSN 1099-0518, Vol. 50, no 13, 2650-2658 p.Article in journal (Refereed) Published
Robust and versatile controlled radical polymerization, also in air, was achieved via single electron transfer living radical polymerization (SET-LRP) initiated by purposely designed hemicellulose-derived macroinitiators. The efficiency of the substitution reaction, converting the polysaccharides into bromo-multifunctionalized initiators, as well as the rate of subsequent induced polymerizations of methyl acrylate were controlled by the hemicellulose repeating unit structure, branching pattern, and molecular weight. Macroinitiators with mannan-based backbones induce SET-LRP with somewhat higher apparent rate constants than xylan-derived analogues, increasing by a factor two to three when raising the reaction temperature from 25 to 40 degrees C. The presence of lignin in a non-purified xylan fraction did not impair its viability as a macroinitiator. Hemicellulose-initiated SET-LRP was feasible in air, proceeding with comparable or somewhat higher apparent rate constants than when conducted under deoxygenated conditions.
Place, publisher, year, edition, pages
2012. Vol. 50, no 13, 2650-2658 p.
air, hemicellulose, living polymerization, macroinitiator, SET-LRP, renewable resources
IdentifiersURN: urn:nbn:se:kth:diva-98317DOI: 10.1002/pola.26041ISI: 000304447800017ScopusID: 2-s2.0-84861536068OAI: oai:DiVA.org:kth-98317DiVA: diva2:537178
QC 201206262012-06-262012-06-252012-06-26Bibliographically approved