Synthesis and characterization of benzodioxinone mono-telechelics and their use in block copolymerization
作者:Cumali ÇELİK
DOI:10.3906/kim-2104-22
日期:——
Poly(methyl methacrylate) (PMMA) and poly(ethylene glycol) methyl ether (mPEG)-based monotelechelics were quantitatively prepared by copper (I)-catalyzed azide/alkyne cycloaddition (CuAAC) click reactions using azido-terminated polymers and alkyne functional benzodioxinones. The monotelechelic containing dimethyl moities (2,2-dimethyl-5-(prop-2-yn-1-yloxy)-4H-benzo[d][1,3]dioxin-4-one) was heat-sensitive, whereas the monotelechelic containing diphenyl moieties (2,2-diphenyl-5-(prop-2-yn-1-yloxy)-4H-benzo[d][1,3]dioxin-4-one) was UV light sensitive. Based on the FT-IR, 1 H-NMR, and GPC investigations, the CuAAC click reactions enable the quantitative syntheses of monotelechelics under mild conditions. Moreover, the photosensitive mPEG-based monotelechelic was further utilized for the block copolymer synthesis upon UV-light irradiation. The photoinduced acylation of mPEG monotelechelic consist of (2,2-diphenyl-5-(prop-2-yn-1-yloxy)-4H-benzo[d][1,3]dioxin-4-one) in the presence of hydroxy-terminated poly(epsilon caprolactone) enabled the successful block copolymer formation.
通过使用叠氮端基聚合物和炔基功能化苯并二噁唑酮,利用铜(I)催化的叠氮/炔环加成(CuAAC)点击反应,定量制备了基于聚(甲基丙烯酸甲酯)(PMMA)和聚(乙二醇)甲醚(mPEG)的单端基分子。其中,含有二甲基部分的单端基分子(2,2-二甲基-5-(丙-2-炔-1-氧基)-4H-苯并[d][1,3]二噁英-4-酮)对热敏感,而含有二苯基部分的单端基分子(2,2-二苯基-5-(丙-2-炔-1-氧基)-4H-苯并[d][1,3]二噁英-4-酮)对紫外线敏感。基于傅里叶变换红外(FT-IR)、核磁共振氢谱(1 H-NMR)和凝胶渗透色谱(GPC)的研究,CuAAC点击反应能够在温和条件下定量合成单端基分子。此外,光敏性mPEG基单端基分子进一步应用于紫外线照射下的嵌段共聚物合成。在羟端基聚ε己内酯的存在下,由光诱导的mPEG单端基分子(包含2,2-二苯基-5-(丙-2-炔-1-氧基)-4H-苯并[d][1,3]二噁英-4-酮)的酰化作用实现了嵌段共聚物的成功形成。