Sulfur-containing hyperbranched polymeric photoinitiator end-capped with benzophenone and tertiary amine moieties prepared via simultaneous double thiol-ene click reactions used for UV curing coatings

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• 作者：Han  ; Xie ; Lihua  ; Hu ; Yong  ; Zhang ; Wenfang  ; Shi  ; ;   ; ^{wfshi@ustc.edu}
• 关键词：Hyperbranched ; Photoinitiator ; Benzophenone ; Thiol-ene click chemistry ; Photoinitiating activity
• 刊名：Progress in Organic Coatings
• 出版年：2011
• 出版时间：November 2011
• 年：2011
• 卷：72
• 期：3
• 页码：572-578
• 全文大小：608 K

文摘

A series of sulfur-containing hyperbranched polymeric photoinitiators end-capped with benzophenone (BP) and tertiary amine moieties (B/A-HPIs) were synthesized via the simultaneous double thiol-ene click reactions of thiolated hyperbranched polymer with both dimethylaminoethyl acrylate and 3-(4-benzoylphenoxy)propyl acrylate. The molecular structures were characterized by ¹H NMR and FT-IR spectroscopy. From the UV¨Cvis spectra, B/A-HPIs showed the stronger n-¦Ð* absorption at ?40 nm with a higher molar extinction coefficients of 371 L mol^? cm^? than 148 L mol^? cm^? of BP, and an obvious red shift of ¦Ð¨C¦Ð* absorption from ?50 nm of BP to ?80 nm. According to the photo-DSC study, the photopolymerization rate of 1,6-hexanediol diacrylate initiated by 5 wt % B/A-HPI was twice higher than that by BP. The DMTA results showed the good miscibility of B/A-HPIs with acrylate resins and high crosslinking density of cured films.