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Two fluorinated diblock copolymers were prepared, characterized, and used to coat cotton fabrics. These copolymers included poly[2-(perfluorohexyl)ethyl acrylate]-block-poly[(triisopropyloxysilyl)propyl methacrylate] (PFHEA-b-PIPSMA) and poly[2-(perfluorohexyl)ethyl acrylate]-block-poly(glycidyl methacrylate) (PFHEA-b-PGMA). The PFHEA block provided the coatings with a low surface tension to help impart water-repellency, while the PIPSMA or PGMA blocks (bearing alkoxysilane or epoxide groups, respectively) allowed the anchoring of the copolymers onto the cotton fibers. A simple coating procedure was used to yield water-repellent cotton fabrics. Water contact angles were measured to evaluate the durability of the treated cotton fabrics after they had been subjected to extraction, washing and laundry tests. These results revealed that cotton fabrics coated with PFHEA-b-PIPSMA were rendered hydrophobic, but their stability was relatively poor. Meanwhile, cotton fabrics coated with PFHEA-b-PGMA exhibited water contact angles higher than 150° and retained their water-repellency even under harsh test conditions.  相似文献
Ambient-curable superhydrophobic fluoropolysiloxane/TiO2 nanocomposite coatings were prepared simply by blending a hydrophobic binder with TiO2 nanoparticles. The binder consisted of triethoxysilyl-terminated fluoropolysiloxane (FPU), polymethylphenyl-siloxane (PMPS), and 3-aminopropyltriethoxysilane. The surface wettability, morphology, mechanical properties, and artificial weatherability were thoroughly investigated, using contact angle analysis, SEM, AFM, pendulum hardness rocker measurements, and nanoindentation measurements, respectively. Superhydrophobic coatings could be fabricated with FPU/PMPS weight ratios of higher than 1:9, and TiO2 loads of over 35 wt%. The superhydrophobic coatings had good mechanical strength, excellent artificial weathering durability, and resistance to organic contaminants. It was demonstrated that the TiO2 nanoparticles acted both as building blocks for the construction of the micro-/nano-structured surface, and as a photocatalyst for the decomposition of organic contaminants.  相似文献
Novel superhydrophobic antistatic coatings were prepared from the branched alternating copolymers P(St-alt-MAn) and carbon nanotubes through a facile method. Pristine multiwalled carbon nanotubes (MWCNTs) were non-covalently modified by an organic–inorganic hybrid of the branched copolymers P(St-alt-MAn) and silica with the existence of γ-aminopropyl-triethoxysilane. The modified MWCNTs were mixed with tetraethyl orthosilicate in ethanol, coated with a fluoroalkylsilane, and then heat treated to obtain the superhydrophobic antistatic coatings. Scanning electron microscopy (SEM) showed that the coatings have a micrometer- and nanometer-scale hierarchical structure similar to that of lotus leaves with high water contact angles (>170°). In addition, the relationship between content of MWCNTs and the properties of the coatings, as well as the effect of cure temperature on contact angle values were investigated systematically.  相似文献
利用层层自组装技术在玻璃表面上沉积二氧化硅纳米颗粒与聚苯乙烯球,高温烧结去除苯乙烯球后可在玻璃基底上构筑由二氧化硅纳米颗粒组成的阶层纳米粗糙微观结构,然后利用1H,1H,2H,2H-全氟癸基三乙氧基硅烷(FAS)进行表面疏水化处理制备透明超疏水表面,该表面与水的接触角高达166°。实验考察SiO2颗粒粒径对超疏水表面性能的影响并针对超疏水表面进行了扫描电镜、傅立叶变换红外光谱、接触角及热重表征。  相似文献
利用硅烷偶联剂与正硅酸乙酯共水解法对SiO2纳米颗粒进行原位疏水化处理,并采用共水解后的溶胶在玻璃基底上浸渍提拉成膜,两次成膜后即可以使玻璃表面呈现良好的超疏水性并保持较好的透明度。论文通过扫描电镜、原子力显微镜、傅立叶变换红外光谱、接触角仪进一步对超疏水表面进行了表征。实验结果显示制备的超疏水表面不仅具有较大的表观接触角(≥150°),而且该表面有着较小的接触角滞后。通过该方法制备的超疏水表面不需要使用昂贵的全氟烷进行后续疏水化处理,从而简化了超疏水表面的制备工艺。  相似文献
以金红石型纳米TiO2及自制的氟树脂制备了氟碳涂料,采用刷涂法于铁片表面构筑了超疏水涂层。考察了纳米TiO2与氟树脂用量、热处理温度等对涂层疏水性的影响,并分别用扫描电镜(SEM)、接触角测量仪观察和测试了涂层表面的微观结构及疏水性。结果表明,涂层表面的水接触角随着氟树脂用量的增加而增大,随纳米TiO2用量的增加呈先增后减的趋势。涂层的吸水率随着氟树脂用量的增加而减少,随纳米TiO2用量的增加呈先减后增的趋势。随着热处理温度的升高,涂层的水接触角先增后减,吸水率先减后增。最佳工艺条件是TiO2及氟树脂的质量分数分别为12%与40%,热处理温度170℃。此条件下得到的涂层表面具有微/纳二元粗糙结构,对水静态接触角达152°,为超疏水涂层,并具有优异的耐水、耐酸碱、耐洗刷、耐沾污及自清洁性能。  相似文献
Zhaokai Meng  Xiaozhong Qu 《Polymer》2011,52(3):597-601
An effective approach is proposed to fabricate a robust superhydrophobic coating constructed from hairy composite spheres. The hairy spheres mimic structure of the papillae on the surface of lotus leaf. The synthesis is based on template method and the corresponding PANi hairy spheres are prepared by polymerization induced diffusion growth via nanosized channels of a polymer cage. The composite spheres become more robust by coating a layer of inorganic materials onto the PANi hairy spheres. By using a middle adhesive layer of epoxy resin, the hairy spheres can be tightly attached to the substrate. The superhydrophobic coating is achieved with a contact angle of 159.9 ± 1.9° and tilt angle below 2° by a post hydrophobic modification with octadecyltrichlorosilane. Such coating is robust enough to resist water flushing and organic solvents. This method can be scaled up for almost all kinds of substrates.  相似文献
采用溶胶-凝胶法,以正硅酸乙酯(TEOS)和甲基三乙氧基硅烷(MTES)为前驱体、硅丙树脂为成膜物质,制备了有机-无机杂化超疏水材料.在对用该材料获得超疏水涂层的研究中,考察了硅丙树脂的含量,比值n(MTES)/n(TEOS)、n(C_2H_5OH)/n(TEOS)和n(NH_3·H_2O)/n(TEOS)对涂层性能的影响.测试结果表明,当硅丙树脂加入量占总物料量的25%(质量分数),摩尔比n(TEOS)∶n(MTES)∶n(C_2H_5OH)∶n(NH_3·H_2O)为1∶4∶30∶10时,涂层具有良好的疏水性和均匀的外观结构,涂层静态水接触角可达156°.  相似文献
We fabricated novel superhydrophobic coatings based on SiO2 nanoparticles combined with NH2‐terminated silicone (SN2) or SN2‐modified polyurethane (SN2‐prePU) by alternately spin‐coating them onto glass slides. The final fabricated surface contained SN2/SiO2 or SN2‐prePU/SiO2 bilayers. The conditions of spin‐coating method were also explored. SN2‐prePU with different SN2/prePU molar ratios were synthesized to study the influence of SN2 ratio on the water contact angles of ultimate spin‐coated surfaces. The surface was found to be tunable from hydrophobic to superhydrophobic by choosing SN2‐prePU with different SN2/prePU molar ratios or SN2 content. Water droplets easily rolled off on these superhydrophobic surfaces. Surfaces coated with SN2/SiO2 bilayers showed better transparency, whereas surfaces coated with SN2‐prePU(2 : 1)/SiO2 bilayers exhibited better durability. Droplets of varied pH were prepared to test the anti‐wettability of the coatings. Results showed that the as‐coated surfaces had stable superhydrophobicity to droplets with pH values ranging from 1 to 14. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015 , 132, 41500.  相似文献
Previous studies on submerged superhydrophobic surfaces focused on performance variables such as drag reduction and longevity. However, to use such surfaces for practical applications, environmental factors such as water salinity must be investigated and understood. In this work, experiments were carried out to investigate the impact of salt (sodium chloride, NaCl) concentrations in aqueous solutions on the hydrophobicity and longevity of polystyrene (PS) fibrous coatings. Rheological studies using salt water as a test fluid were performed to determine the effect of salt concentration on drag reduction. Contact‐angle measurements were used to validate the results from the rheometer. In situ noninvasive optical reflection was used to measure the longevity of the coating—time‐dependent loss of entrapped air within the coating—as a function of salinity. The superhydrophobic coating used herein consisted of PS fibers that were deposited using DC‐biased AC‐electrospinning. Electrospinning is scalable and far less expensive than conventional methods (e.g., microfabrication), bringing the technology closer to large‐scale submerged bodies such as submarines and ships. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2011  相似文献
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