摘要： 采用发散法合成了以乙二胺为核的0.5～3.5代树枝状大分子聚酰胺-胺(PAMAM),研究了半代PAMAM在酸性条件下的水解反应,用傅里叶变换红外光谱和核磁共振法对半代PAMAM和PAMAM水解酸进行了表征。通过丙烯酸羟乙酯与半代PAMAM水解酸的反应,合成了不需添加稀释剂,在紫外光作用下便能固化成膜的树枝状聚酰胺-胺紫外光固化树脂,得到的光固化膜表面光滑、柔软、颜色均匀、内部无气泡且表观性能较好,解决了为降低高分子材料黏度必须加入大量稀释剂的问题。傅里叶变换红外光谱证明了丙烯酸羟乙酯改性成功,测定了合成的光固化树脂溶解性、紫外光固化膜的熔点、热稳定性等性能,并对其性能变化的规律进行了探讨。测试表明合成的产物不同,其溶解性能有较大的不同,只能溶解在极性较大的水、甲醇、N,N-二甲基甲酰胺中。随着代数的增加,紫外光固化膜的熔点逐渐降低;TG分析表明紫外光固化膜的热分解反应是一个由外层向内层分步进行的过程,初始分解均在170℃以上,固化膜具有较好的稳定性。
关键词:
树枝状大分子,
聚酰胺-胺,
改性,
紫外光固化
Abstract: A series of polyamidoamine(PAMAM) dendrimer from 0. 5 generation to 3. 5 generation have been synthesizd by divergent method. Half generation of PAMAM (0. 5G, 1. 5G,2.5G, 3. 5G) were hydroly.sised in acidic conditions. The compositions and structures of half generation of PAMAM and its hydrolyzed products were characterized by means of FT-IR and 1H NMR. The hydrolyzed products were modified with hydroxyethyl acrylate to form a Uv-curable polyamidoamine dendrimer which couled be cured under UV light without diluent. Film surface was smooth, soft, uniform color, no air bubbles inside and showed a better apparent performance, solving the problem that a lot of thinner needed to be added in order to reduce the viscosity of polymer materials. FT-IR proved the success of modification. The properties of the modified resin were tested, such as solubility(uv-curable resin), melting point and heat stability(uv-curable film)The property of the different generation products were researched. The solubility of modified PAMAM had a great change after hydrolysis, which could only be dissolved in many strong polar solvents, for example, water, methanol and N, N-dimethyl formamide. DSC test showed that the melting point of the Uv-curable Gilm was decreased with the increase of generation. TG analysis showed that the thermal decomposition reaction of the Uv-curable film was a stepwise process from the outer to the inner. Temperature of initial decom.position of film was above 170 ℃, showing a good heat stability.
Key words:
dendrimer,
polyamidoamine,
modification;UV curing
胡加娟, 郭秀生, 于德梅, 苏敏茹, 郭容男. 树枝状聚酰胺-胺紫外光固化树脂的合成[J]. 涂料工业, 2011, 41(11): 5-10.
Hu Jiajuan, Guo Xiusheng, Yu Demei, Su Minru, Guo Rongnan. Synthesis of Uv-curing Polyamidoamine Dendrimer Resin[J]. Paint & Coatings Industry, 2011, 41(11): 5-10.