A photo-induced nitroxide trapping method to prepare α, ω-heterotelechelic polymers. Issue 14 (15th March 2016)

• Record Type: Journal Article
• Authors: Su, Jiahui; Huang, Hong; Cui, Yanyan; Chen, Yingyin; Liu, Xiaoxuan
• Is Part Of: Polymer chemistry. Volume 7:Issue 14(2016)
• Page Start: 2511
• Page End: 2520
• Publication Date: 2016-03-15
• Subjects: Polymers -- Periodicals; Macromolecules -- Periodicals; Polymerization -- Periodicals; 547.705
• DOI: 10.1039/c6py00104a
• Languages: English
• ISSNs: 1759-9954

Abstract

Abstract : A facile and general strategy for the preparation of telechelic polymers is demonstrated via a photo-induced nitroxide radical trapping method. Abstract : Two types of photoactive polymers with an alkoxyphenyl ketone moiety at their backbone centers were synthesized through atom transfer radical polymerization. A facile protocol for preparing α, ω-heterotelechelic polymers was developed, employing nitroxide with different functional groups ( e.g., hydroxyl, propargyl, glycidyl, and polyethylene glycol) coupled with macromolecular radicals generated via the Norrish-type I photoreaction under mild UV irradiation from the said polymers. Experimental conditions such as solvent effects and irradiaton time were investigated to optimize the efficiency of reaction functionality. The number-average molecular weights of the photoactive polymers and α, ω-heterotelechelic polymers were determined by gel permeation chromatography. Material structures were further confirmed by 1 H NMR and FT-IR spectroscopy. The end group activity of α, ω-heterotelechelic polymers obtained from this reaction was further demonstrated using the Cu-catalyzed azide–alkyne click reactions between PS-N3 and polystyrene capped with a propargyl group.