Preparation of Hydrophobic Fluoroacrylate Polyurethane Films with Low Dielectric Lossfla
Abstract: Fluoroacrylate copolymers with different fluoroacrylate monomer content and hydroxyl monomer content are synthesized by free-radical solution polymerization. The comonomers are composed of methyl methacrylate (MMA), butyl acrylate (BA), acrylic acid (AA), 2-hydroxypropyl acrylate (2-HPA) and dode-cafluoroheptyl methacrylate (G-04). Fluoroacrylate polyurethane (FPU) is prepared by curing the copolymers with HDI (hexamethylene diisocyanate) trimer. The hydrophobicity, dielectric properties, and transparency of FPU films are investigated. The comparative investigation is carried out with polyurethane obtained by re-acting with commercial resin of ZY-1 and SGK-5701. The results indicated that fluoroacrylate polyurethane possess a lower contact angle(CA), excellent hydrophobic stability，lower dielectric constant and dielectric loss. And the transmittance is higher in the whole visible wavelength range ( > 90%) than the FPU prepared by commercial resin. The FPU film exhibits excellent hydrophobicity(CA > 98°) and hydrophobic stability with a lower water absorption ( < 0.5%) by adjusting the fluoroacrylate monomer content. The dielectric con-stant and dielectric loss of the film is less than 2.5 and 0.01, respectively when the fluoroacrylate monomer content higher than 22 wt.%. The FPU may be used as the hydrophobic materials coated on the surface of radome according to their outstanding properties such as higher optical transmittance, lower surface energy and lower dielectric loss.
文章引用: 郭玉娣 , 唐冬雁 (2011) 低介电损耗氟化丙烯酸聚氨酯疏水材料的制备。 材料科学， 1， 85-92. doi: 10.12677/ms.2011.13016
 王娟, 张长瑞, 冯坚. 低介电常数介质薄膜的研究进展[J]. 化学进展, 2005, 17(6): 1001-1011.
 郭笑坤, 殷立新，詹茂盛. 低介质损耗雷达罩用复合材料的研究进展[J]. 高科技纤维与应用, 2003, 28(6): 29-33
 B. Ameduri, R. Bongiovanni, V. Lombardi, A. Pollicino, A. Priola and A. Recca. Effect of the structural parameters of a series of fluoromonoacrylates on the surface properties of cured films. Journal of Polymer Science Part A: Polymer Chemistry, 2001, 39(24): 4227-4235.
 Y.-S. Kim, J.-S. Lee, Q. Ji and J. E. McGrath. Surface properties of fluorinated oxetane polyol modified polyurethane block copolymers. Polymer, 2002, 43(25): 7161-7170.
 C. Tonelli, T. Trombetta, M. Scicchitano, G. Simeone and G. Ajroldi. New fluorinated thermoplastic elastomers. Journal of Applied Polymer Science, 1996, 59(2): 311-327.
 A. Aneja, G. L. Wilkes. A systematic series of “model” PTMO based segmented polyurethanes reinvestigated using atomic force microscopy. Polymer, 2003, 44(23): 7221-7228.
 R. D. van de Grampel, W. H. Ming, J. Laven, R. van der Linde and F. A. M. Leermakers. Surface heterogeneity of a fluorinated block copolymer melt studied by a self-consistent-field analysis. Polymer, 2007, 48(13): 3877-3882.
 T. H. Chiang, S.-L. Liu, S.-Y. Lee and T.-E. Hsieh. Preparation, microstructure and property characterizations of fluorinated polyimide-organosilicate hybrids. European Polymer Journal, 2008, 44(11): 3482-3492.
 D. W. Smith Jr., D. A. Babb, H. V. Shah, A. Hoeglund, R. Traiphol, D. Perahia, H. W. Boone, C. Langhoff and M. Radler. Perfluorocyclobutane (PFCB) polyaryl ethers: Versatile coatings materials. Journal of Fluorine Chemistry, 2000, 104(1): 109-117.
 罗晓斌, 朱定一, 石丽敏. 基于接触角法计算固体表面张力的研究进展[J]. 科学技术与工程, 2007, 19(7): 4997-5004.