含氟丙烯酸酯-聚氨酯共混膜自组织梯度化

Self-organization Gradient Structure of Fluorinated Acrylate Polymer-Waterborne Polyurethane Blend Latex Film

摘要:

通过细乳液聚合法，以异佛尔酮二异氰酸酯(IPDI)、聚醚二醇(PTMG)、N-甲基二乙醇胺(MDEA)、三羟甲基丙烷(TMP)及全氟烷基丙烯酸酯(FA)为原料，制备不同FA用量的氟化聚氨酯(PUFPA)乳液。采用红外光谱(FT-IR)、表面自由能分析(SFE)、原子力显微镜(AFM)、扫描电镜结合电子能谱(SEM-EDS)、X光电子能谱(XPS)研究了FA用量对PUFPA乳胶膜自组织梯度结构的影响。结果表明，当FA用量为40 %时，乳胶膜F-A(膜-空气)面与F-P(膜-基材)面表面自由能差异显著、断面出现相分层，含氟组分(FPA)在F-A面开始富集，乳胶膜呈明显梯度化结构；乳胶膜经热处理(10 ℃/2 h)后，膜F-A面接触角(H2O)达到132.5?，疏水程度增大，膜正反面的表面自由能差异进一步增大，断面分层更明显，且从膜F-A面到膜F-P面沿厚度方向氟元素浓度逐渐降低，梯度化结构更加明显。

Abstract:

Fluorinated polyurethane (PUFPA) emulsions of different fluorine monomers were synthesized by isophorone diisocyanate (IPDI), polyether diol (MDEA), N-mthyldiethanolamine (MDEA), trimethylolpropane (TMP), and Perfluoroalkyl acrylate (FA) via miniemulsion polymerization. The effects of the amount of FA on the properties of the self-organized gradient structure of latex film were investigated by infrared spectroscopy, surface free energy, atomic force microscope, scanning electron microscopy and X-ray photoelectron spectroscopy. The results shows: with the increasing of the amount of FA; the surface free energy difference between the F-A (film-air) surface and the F-P (film-polytetrafluoroethylene substrate) surface of PUFPA40 % film is obvious, the cross-section of PUFPA40% film is stratifie, the fluorinated component (FPA) is enrich at F-A surface and gradient structure is more obvious when the amount of FA is 40 %; The surface contact angle (water) of the latex film F-A reached 132.5?, which increased hydrophobicity significantly, and the gradient structure of PUFPA is more obvious after being heat treatmented (110 ℃/2 h).