双键可控紫外光固化超支化聚氨酯丙烯酸酯的制备与表征

以甘油为核,二乙醇胺(DEOA)和异佛尔酮二异氰酸酯(IPDI)为原料,合成了含6个端羟基的加核型超支化聚氨酯(HBPU-OH),再通过加入IPDI和丙烯酸羟乙酯(HEA)等原料引入聚氨酯基团和丙烯酸双键,制备出加核型双键数目可调的紫外光(UV)固化超支化聚氨酯丙烯酸树脂(HBPUA).用傅里叶交换红外光谱和核磁共振波谱表征了HBPUA的结构,用示差扫描量热仪和热重分析仪研究了HBPUA的热性能.结果表明,合成了超支化结构的HBPUA;HBPUA玻璃化转变温度(T_g)为67.8℃,低于HBPU-OH的T_g(110.0℃),这是由于HEA的引入增加了分子的柔性;HBPU-OH和HBPUA的热分解均出现3个阶段.

Preparation and Characterization of UV Curable Hyperbranched Polyurethane Acrylate with Adjustable Double Bond

The hyperbranched polyurethane with six hydroxyl-terminated groups( HBPU-OH) was synthesized by glycerol as the core and diethanolamine ( DEOA ) , isophorone diisocyanate ( IPDI ) as the branched monomer. Through further reacting with the half adduct of isocyanate-hydroxyethyl acrylate( IPDI-HEA) , the obtained HBPU-OH was transformed into the UV-curable hyperbranched polyurethane acrylate ( HBPUA ) , where the number of acrylic double bonds is adjustable. The Fourier transform infrared spectroscopy( FTIR) and nuclear magnetic resonance spectroscopy ( 13 C NMR ) were used to analyze the molecular structure of HBPUA and HBPU-OH. The results show that HBPUA was successfully synthesized. The differential scanning calorimeter( DSC) analyses indicate that displays the temperature of glass transition( Tg=67. 8 ℃) of HBPUA is lower than the Tg(110. 0 ℃) of HBPU-OH can be attributed to the introducing of hydroxyethyl acrylate. Furthermore, the thermal gravimetric analysis( TG) results show that both of the HBPU-OH and HBPUA have similar three-stage decomposition process.