光固化环氧全氟辛酸酯聚氨酯的研究

Study on epoxy perfluorooctanoate polyurethane

以环氧树脂、全氟辛酸、聚乙二醇、异佛尔酮二异氰酸酯(IPDI)和甲基丙烯酸羟乙酯为原料,通过四步反应合成了一种新型的可光固化的聚氨酯大分子单体。利用1H-NMR、IR、接触角、XPS、DSC、TGA、TEM等分析测试手段对单体的结构以及含氟聚合物的表面特性,热性能和断面形貌进行了研究。接触角和XPS的结果表明由于含氟聚合物中的全氟链段容易向表面迁移,使得固化膜表面对H2O和CH2I2的接触角可以达到108.9°和92.3°,具有低的表面自由能,能够有效地改善涂膜的耐水、耐油等性能;热性能以及断面形态分析发现该聚合物表现出较好的热性能和柔韧性。

A UV -curable polyurethane macromolecule monomer, consisting of epoxy perfluorooctanoate and polyethylene glycol segments in main lengths, was synthesized in solution by a four- step method, using epoxy resin（E- 44）, perfluorooctanoic acid, polyethylene glycol and isophorone diisocyanate. The curing reaction of polyurethane was carried out by UV irradiation. The chemical structure of polyurethane macromolecule monomer was confirmed by ^1H - NMR and IR spectrum. The surface properties, thermal behavior and photograph of the fracture surfaces of fluorinated polymer were characterized by contact angle measurements, X- ray photoelectron spectroscopy（XPS）, thermogravimetric analyzer（TGA）, DSC and SEM. Results from contact angle and XPS indicated that the surface of fluorinated polymer film were low surface free energy and contact angle were 108.9° and 92.3° for water and diiodomethane due to migration of fluorinated side chains to the surface. Results from TGA, DSC and SEM indicated that fluorinated polymer had good tough and heat stability properties.