为提高水性聚氨酯薄膜的耐水性能,以异佛尔酮二异氰酸酯(IPDI)和聚四氢呋喃(Mn＝2000)为主要原料,含氟二元醇Rf(OH)2为改性剂,二羟甲基丙酸(DMPA)为亲水单体,合成含氟水性聚氨酯.探讨了改性剂Rf(OH)2用量对聚氨酯乳液及涂膜性能的影响.并采用红外光谱(FT-IR),差示扫描量热(DSC),X射线(XRD)及原子力显微镜(AFM)分析研究了聚合体系的结构及性能.结果表明,随着 Rf(O H )2用量增加,胶膜水接触角由80．72°增加至99．35°,吸水率降低了6．6％,耐水性得到明显改善；乳液粒径先增加后减小,当 Rf(OH)2用量为3％时,乳液粒径最大,达到147 nm.XRD、AFM及 DSC 测试表明,胶膜的结晶度增加,结晶形式发生了微小程度的转变；聚合物存在不均匀的多相结构；改性后胶膜耐热性得以提高.
A novel fluorinated polyurethane (FWPU)was synthesized in which isophorone diisocyanate (IPDI) and polyethylene tetrahydrofuran (PTMEG,Mn=2 000)were as raw material,dihydroxy methyl propionic acid (DMPA)was as hydrophilic monomer and fluoride glycol (Rf(OH)2 )was as the modifier.The influences of the Rf(OH)2 content on the properties of polyurethanes were studied.The water contact angle was increased from 80.72°to 99.35°with the increase of Rf(OH)2 groups.Water absorption was reduced by 6.6%.Particle size distribution (PSD)analysis indicated that the particle size of FWPU films first increased then decreasesd.When the content of Rf(OH)2 was 3.0wt%,the particle size is 147 nm.XRD,AFM and DSC were used for character-ization of the FWPU films to verify the results.Showed that multiphase structure existed in the fluorinated pol-yurethane,the thermal stability and crystallinity of fluorinated polyurethane glue film was increased.
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