SYNTHESIS AND CHARACTERIZATION OF HYPERBRANCHED POLYURETHANE-BENZYLTETRAZOLE  

作　　者：施文芳 

机构地区：[1]CAS Key Laboratory of Soft Matter Chemistry,Department of Polymer Science and Engineering,University of Science and Technology of China

出　　处：《Chinese Journal of Polymer Science》2011年第6期670-683,共14页高分子科学（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(Nos.50633010 and 50973100)

摘　　要：A series of hyperbranched polyurethane-benzyltetrazoles （H-PBTZs） with different linkage structures were synthesized via the polycondensation of hexamethylenediisocyanate as an A2 type monomer with （4-（1H-tetrazol-5- yl）benzyl）-diethanolamine （TBDEA） as a BB＇2 type monomer in the absence of catalyst at different temperatures. The FTIR, and 13C and 1H-NMR spectroscopy were used to characterize the molecular structures of TBDEA and H-PBTZs as well as the counterpart linear polyurethane-benzyltetrazole （L-PBTZ）. The molecular composition was determined by the reaction selectivity that the isocyanate group reacted with the hydroxyl group in diethanolamine segment or the active hydrogen atom on tetrazole ring. Raising reaction temperature was propitious to the reaction of isocyanate group with the active hydrogen atom on tetrazole ring. The degrees of branching （DB） for H-PBTZs obtained from the 1H-NMR spectra increased with raising reaction temperature. The wider molecular weight distribution of 1.7-2.9 for H-PBTZs was obtained via GPC analysis. TGA results showed that H-PBTZs had high thermal stability compared with L-PBTZ.A series of hyperbranched polyurethane-benzyltetrazoles （H-PBTZs） with different linkage structures were synthesized via the polycondensation of hexamethylenediisocyanate as an A2 type monomer with （4-（1H-tetrazol-5- yl）benzyl）-diethanolamine （TBDEA） as a BB＇2 type monomer in the absence of catalyst at different temperatures. The FTIR, and 13C and 1H-NMR spectroscopy were used to characterize the molecular structures of TBDEA and H-PBTZs as well as the counterpart linear polyurethane-benzyltetrazole （L-PBTZ）. The molecular composition was determined by the reaction selectivity that the isocyanate group reacted with the hydroxyl group in diethanolamine segment or the active hydrogen atom on tetrazole ring. Raising reaction temperature was propitious to the reaction of isocyanate group with the active hydrogen atom on tetrazole ring. The degrees of branching （DB） for H-PBTZs obtained from the 1H-NMR spectra increased with raising reaction temperature. The wider molecular weight distribution of 1.7-2.9 for H-PBTZs was obtained via GPC analysis. TGA results showed that H-PBTZs had high thermal stability compared with L-PBTZ.

关 键 词：SYNTHESIS Hyperbranched polyurethane-benzyltetrazole Degree of branching Characterization. 

分 类 号：O633.14[理学—高分子化学]