水性聚氨酯是更环保的材料,由于较低的挥发性有机化合物(VOCs,主要是异氰酸酯)含量高于替代材料。然而,这些富含亲水基团的聚合物尚未达到良好的机械性能,耐久性和疏水性行为。因此,疏水性水性聚氨酯已成为研究热点,吸引大量注意力。在这项工作中,首先,通过2-(2,2,3,3-四氟丙氧基甲基)-环氧乙烷(FPO)和四氢呋喃(THF)的阳离子开环聚合合成了一种新型含氟聚醚P(FPO/THF)。其次,氟化聚合物P(FPO/THF),采用异佛尔酮二异氰酸酯(IPDI)和端羟基多面体低聚倍半硅氧烷(POSS-(OH)8)制备新型氟化水性聚氨酯(FWPU)。羟基封端的POSS-(OH)8用作交联剂,而二羟甲基丙酸(DMPA)和三乙胺(TEA)用作催化剂。通过添加不同含量的POSS-(OH)8(0%,1%,3%,5%)。通过1HNMR和FT-IR验证了单体和聚合物的结构,通过热重分析仪(TGA)和差示扫描量热法(DSC)分析了各种水性聚氨酯的热稳定性。作为结果,热分析表明,FWPU具有良好的热稳定性,玻璃化转变温度可以达到约-50℃。FWPU1薄膜的断裂伸长率为594.4±3.6%,断裂拉伸强度为13.4±0.7MPa。阐明了FWPU1膜相对于替代FWPU发展出优异的机械性能。Further,FWPU5薄膜表现出了有希望的性能,包括通过原子力显微镜(AFM)分析获得的较高表面粗糙度(8.41nm)的FWPU5薄膜,在104.3±2.7°时,水接触角(WCA)值较高。这些结果表明,含氟元素的新型POSS基水性聚氨酯FWPU可以发挥优异的疏水性和机械性能。
Waterborne polyurethane are more eco-friendly materials due to lower volatile organic compounds (VOCs, mainly isocyanates) content than the alternative materials. However, these rich hydrophilic groups polymers have not yet reached good mechanical properties, durability and
hydrophobicity behaviors. Therefore, hydrophobic waterborne polyurethane has become a research hotspot, attracting significant attention. In this work, firstly, a novel fluorine-containing polyether P(FPO/THF) was synthesized by cationic ring-opening polymerization of 2-(2,2,3,3-tetrafluoro-propoxymethyl)-oxirane (FPO) and tetrahydrofuran (THF). Secondly, fluorinated polymer P(FPO/THF), isophorone diisocyanate (IPDI) and hydroxy-terminated polyhedral oligomeric silsesquioxane (POSS-(OH)8) were used to prepare a new fluorinated waterborne polyurethane (FWPU). Hydroxy-terminated POSS-(OH)8 was used as a cross-linking agent, while dimethylolpropionic acid (DMPA) and triethylamine (TEA) were used as a catalyst. Four kinds of waterborne polyurethanes (FWPU0, FWPU1, FWPU3, FWPU5) were obtained by adding different contents of POSS-(OH)8 (0%, 1%, 3%, 5%). The structures of the monomers and polymers were verified by 1H NMR and FT-IR, and the thermal stabilities of various waterborne polyurethanes were analyzed by thermogravimetric analyzer (TGA) and differential scanning calorimetry (DSC). As the results, the thermal analysis showed that the FWPU performed the good thermal stability and the glass transition temperature could reach at about -50 °C. The FWPU1 film exhibited that the elongation at break was 594.4 ± 3.6% and the tensile strength at break was 13.4 ± 0.7 MPa, elucidating that the FWPU1 film developed the excellent mechanical properties relative to the alternative FWPUs. Further, the FWPU5 film performed the promising properties, including the higher surface roughness of FWPU5 film (8.41 nm) obtained by the atomic force microscope (AFM) analysis, and the higher value of water contact angle (WCA) at 104.3 ± 2.7°. Those results illustrated that the novel POSS-based waterborne polyurethane FWPU containing a fluorine element could develop the excellent
hydrophobicity and mechanical properties.