超支化聚(胺酯)的合成及其光固化性能研究

STUDY OF PHOTOPOLYMERIZATION CHARACTERISTICS OF HYPERBRANCHED METHACRYLATED POLY(AMINE-ESTER)S

采用甲基丙烯酸酐直接改性和先以丁二酸酐或邻苯二甲酸酐酯化再以甲基丙烯酸缩水甘油酯改性所得到的甲基丙烯酸酯化超支化聚 (胺 酯 )齐聚物在光引发剂存在时紫外光辐照下发生快速聚合反应 ;反应速率和双键转化率随超支化分子的结构不同而变化 ;

The hyperbranched methacrylated poly(amine\|ester) oligomers synthesized from N,N\| diethylol\|3\|amine methylpropionate and 1,1,1\|trimethylolpropane as an “initiator core”,building hyperbranched arms,end\|capped glycidyl methacrylate and methacrylic anhydride, respectively,are very reactive compounds which undergo fast polymerization by a radical mechanism at the presence of a photofragmenting initiator under UV irradiation.The unsaturation conversion reaches to 70% in 2 s irradiation and then to 85% in 8 s irradiation with 1kW UV lamp HPM 15 from Philips at the distance of 100 mm from the sample measured by FT\|IR.However,65% of the unsaturation conversion is obtained in 20 s irradiation with 250W UV medium pressure lamp measured by Photo\|DSC.A kinetic study of the UV\|induced curing of the hyperbranched poly(amine\|ester)s by evaluating the reaction rate and unsaturation conversion with Photo\|DSC has shown that methacrylic anhydried\|modified oligomer without monomer added has much higher photocuring speed and lower unsaturation conversion than that modified by glycidyl methacrylate.The higher thermal properties of UV cured oligomer films with higher unsaturation conversion have been obtained measured by TGA.The hyperbranched methacrylated poly(amine\|ester) prepolymers are very competitive with traditional linear ones used in radiation curable coatings,inks and adhesives.