超支化聚(酯-胺)分子结构及固化涂层性能研究

近年来,颜德岳等基于A2型单体二丙烯酸酯及BB2′型单体二胺化合物合成了多种端胺基超支化聚(酯-胺),并对反应机理及聚合物结构进行了系统研究[1,2],结果表明,由于B与B′活性差异,反应首先生成AB2′型和B4′型中间体,进一步聚合得到可溶性产物.我们基于A3型单体三丙烯酸酯与B2型单体二胺化合物合成了端丙烯酸酯基超支化聚(酯-胺)[3,4].在这些体系中,由于官能团反应活性高,难以控制反应程度.另外,由于超支化聚合物不能直接用作结构材料,其在涂料、粘合剂等领域的应用多基于末端官能团的固化反应[5].但通常由于官能团在分子表面密集分布,部…

INVESTIGATION ON MOLECULAR STRUCTURES AND CURING PERFORMANCES OF HYPERBRANCHED POLY(ESTER-AMINE) S

n-Dodecylamine was used as reaction terminator to control the molecular structures of amine terminated hyperbranched(poly(ester-amine)s)(HPEA) synthesized from phthalicdiglycol diacrylate and 1-(2-aminoethyl)piperazine at molar ratio of 1:1 by Michael addition reaction.From the()~1H-NMR spectra of HPEA,the degree of branching increased and the amino active hydrogen content decreased with prolonging the reaction time.HPEA were further cured with β-glycidyloxylpropyl trimethoxysilane under ambient condition.The highest gel content and best mechanical properties of the cured coatings at active hydrogen and epoxy group stoichiometric ratio of 1∶1 can be attributed to the stepwise curing process,involving the fast reaction between amino active hydrogen and epoxy groups,and the slow hydrolysis and self-condensation of methoxysilane groups.