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热处理对超疏水性含氟丙烯酸酯共聚物膜表面性能的影响 总被引:3,自引:1,他引:3
以微乳液聚合法和溶液聚合法制备丙烯酸全氟烷基乙基酯和甲基丙烯酸甲酯的共聚物, 以1,1,2-三氟三氯乙烷为溶剂, 采用溶剂挥发成膜法直接制备出超疏水膜, 并研究120 ℃热处理对超疏水膜表面性能的影响. 对于用乳液聚合方法制备的超疏水膜, 随着热处理时间的延长, 滚动角表现出先逐渐增大直至完全不能滚动, 然后重新回复到极小滚动角的特殊变化过程, 而静态接触角只是略微减小, 完全不同于热处理对平滑的含氟聚合物表面接触角的影响. 扫描电镜结果显示, 聚合物膜表面形貌对应出现从微/纳复合粗糙结构到微孔粗化并重新形成微/纳复合多层粗糙结构的变化. 相似文献
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含氟丙烯酸酯-苯乙烯共聚物的制备及其表面性能的研究 总被引:4,自引:0,他引:4
研究了聚合工艺、含氟丙烯酸酯类单体种类和用量、苯乙烯和自由基引发剂用量及硅烷偶联剂、催化剂等因素对含氟丙烯酸酯-乙烯共聚物表面性能的影响。结果表明:聚合工艺、含氟丙烯酸酯类单体种类和用量对共聚物表面的憎水性能有显著的影响;采用延时滴加含氟丙烯酸酯类单体可提高共聚物膜表面的憎水性;随含氟丙烯酸酯类单体侧链含氟烷基的链长和氟原子数及含氟单体用量的增加,共聚物水接触角增大,吸水率下降;共聚物薄膜的硬度则与含氟丙烯酸酯类单体中α-取代基、侧链含氟烷基的链长和用量、苯乙烯用量、引发剂浓度等相关;硅烷偶联剂和催化交联剂的加入可提高共聚物薄膜的强度。 相似文献
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超疏水性表面的制备及应用进展 总被引:1,自引:0,他引:1
近年来,受荷叶、水黾腿、壁虎脚等天然超疏水生物表面特性的启发,研究者们进行了大量仿生超疏水表面材料的制备及应用研究。超疏水性表面因其特殊的微纳分层结构,具有自清洁、防覆冰、防腐蚀、减阻等优异性能。本文阐述了表面润湿、疏水的基本机理,以及超疏水表面研究的理论基础,对超疏水表面制备的最新研究进展进行了综述,并揭示了研究中存在的问题。最后,介绍了超疏水表面在涂料、织物、防腐、抗菌及防雾等领域中的应用,展望了其未来的研究方向和前景。 相似文献
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以砂纸为模板制作聚合物超疏水表面 总被引:7,自引:2,他引:5
报道了一种聚合物材料超疏水表面的简便制备方法. 以不同型号的金相砂纸为模板, 通过浇注成型或热压成型技术, 在聚合物表面形成不同粗糙度的结构. 接触角实验结果证明, 聚合物表面与水的接触角随着所用砂纸模板粗糙度的增加而加大, 其中粒度号为W7和W5砂纸制作的表面与水的接触角可超过150°, 显示出超疏水性质. 多种聚合物使用砂纸为模均可制备不同粗糙度及超疏水的表面, 本征接触角对复制表面浸润性的影响从Wenzel态到Cassie态而变小. 扫描电镜结果表明, 不规则形状的砂纸磨料颗粒构成了超疏水所需要的微纳米结构的模板. 相似文献
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Two kinds of poly(dimethylsiloxane) (PDMS) rough surfaces with different geometries which were square pillars and parallel grating were designed and fabricated by replica molding (REM). Scanning electron microscope (SEM) images showed that the fabricated samples had high fidelity. The contact angles of water droplet on the PDMS square pillars surface and parallel grating surface were (154.6依0.7)° and (160.2依1.9)°, respectively, and the sliding angles were not larger than 6° and 3°, respectively, which attained to the standard of superhydrophobicity. The experimental result of blood platelets adhesion demonstrated that these two superhydrophobic PDMS rough surfaces had better blood compatibility than PDMS planar surface. The crazing and shedding of microstructures in the replica molding were also analyzed and discussed. All results showed that these superhydrophobic materials may be used in industrial and agricultural fields and bioengineering field. 相似文献
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氟化(甲基)丙烯酸酯聚合物是一类新型的低表面能材料,它的氟化链段使其具有优异的疏水疏油性能,而非氟化(甲基)丙烯酸酯链段则赋予了其良好的溶解性和相容性。通过设计和控制氟化(甲基)丙烯酸酯聚合物的结构可改变聚合物表面润湿性。本文综述了影响氟化(甲基)丙烯酸酯均聚物、无规共聚物、嵌段共聚物、接枝共聚物、核壳共聚物和交联网状共聚物表面润湿性的因素,通过分析聚合物的结晶度、表面元素含量、表面能和接触角讨论了聚合物结构与表面润湿性及润湿稳定性之间的关系,并给出了相关模型,为今后设计合成具有稳定表面润湿性的氟化(甲基)丙烯酸酯聚合物提供了理论依据和指导。 相似文献
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采用简单的激光刻蚀方法制备了具有类“菜花”状多级结构的粗糙聚二甲基硅氧烷(PDMS)膜, 并用CCD与高敏感性微电力学天平观察和测量PDMS表面对水的吸附情况. 结果表明, 该膜表面具有超疏水性, 同时对水滴具有超低的吸附力. 还对其表面特殊多级结构产生的机理进行了分析, 并探讨了在化学组成和表面结构对超疏水性以及吸附性产生的影响. 相似文献
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Canturk Ozcan Pınar Zorlutuna Vasıf Hasirci Nesrin Hasirci 《Macromolecular Symposia》2008,269(1):128-137
For any biomaterial placed into a biological medium, the surface properties of the material, such as porosity, crystallinity, presence and distribution of electrical charge and functional groups are very critical parameters that determine the acceptance or rejection of the material. Applications, especially tissue engineering require some surface modifications at the molecular level without disturbing the bulk properties of the implants in order to enhance the cell attachment on the material. An appropriate technique is the application of glow discharge plasma which employs no solvents, takes place at ambient temperatures, and alterations take place only at the surface by changing the surface chemistry along with surface free energy (SFE) and efficiency for cell-material interaction. In this study, poly(methyl methacrylate) (PMMA) film surfaces were modified with oxygen plasma. SFE and its dispersive and polar (acidic-basic) components of the modified surfaces were calculated by means of several theoretical approaches including geometric mean, harmonic mean and acid-base equations. The relation between SFE and its dispersive and polar components and cell attachment on surfaces were studied. The highest 3T3 cell attachment was obtained for the surface with the total SFE of 61.77 mJ/m2 and polar component of 50.91 mJ/m2 according to Geometric mean. The total SFE of this surface was calculated to be 61.06 mJ/m2 and the polar component as 40.96 mJ/m2 using the Harmonic mean method. 相似文献
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采用自由基溶液聚合法成功合成了多面体低聚倍半硅氧烷(POSS)基杂化含氟丙烯酸酯共聚物,并采用核磁共振仪(NMR)和凝胶渗透色谱仪(GPC)表征了共聚物,其中POSS和含氟单体分步加入到反应中.首先将共聚物溶解到三氟三氯乙烷(F113)和乙酸乙酯的混合溶剂中配制成溶液,然后通过直接在玻璃片上滴落共聚物溶液制备了共聚物涂膜.采用扫描电子显微镜(SEM)、X-射线光电子能谱(XPS)、原子力显微镜(AFM)和接触角测量仪考察了F113和乙酸乙酯的配比对共聚物涂膜表面形貌、表面元素组成、表面粗糙度以及表面疏水性的影响.实验数据表明POSS在表面能够聚集成纳米颗粒并能极大增强涂膜表面粗糙度和疏水性.共聚物表面同时存在POSS聚集与有机相微相分离两类相分离行为,并形成了复合粗糙结构.虽然POSS和含氟段竞争迁移到表面,但是随着混合溶剂中F113的增多,涂膜表面含氟量越来越多,同时POSS在表面的聚集体越来越少,表面平均粗糙度越来越小,最终涂膜的疏水性越来越强,这说明F113有助于提升氟的趋表迁移能力,使涂膜表面含氟链段占据较多的表面空间,从而抑制了POSS在表面聚集分布.当使用纯F113作为溶剂时,共聚物涂膜的表面氟含量为45.25%,平均粗糙度为93.4 nm,此时静态水接触角最大为135.0?,表现出优异的疏水性. 相似文献
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Using the mixture of triethyl phosphate (TEP) and N,N‐dimethylacetamide (DMAc) as solvent, PVDF microporous membranes with highly hydrophobic surface were prepared by a modified NIPS method with a dual coagulation process. The effects of the exposure time on these membranes before being immersed into the coagulation bath and the composition in the coagulation bath on precipitation rate, membrane morphology, membrane hydrophobicity, membrane mechanical property, and membrane performance were studied. The morphologies and hydrophobicities of PVDF microporous membranes were investigated by scanning electron microscopy (SEM) and contact angle (CA) measurement. The precipitation processes were observed by light transmittance measurement. The pore size distribution was determined by liquid permeation technique. PVDF microporous membrane obtained by passing evaporation period of 60 min before being immersed into the water bath showed a high water CA of 122.1°. Using ethanol (EtOH) as coagulation bath, the water CAs of the top surface and bottom surface of the membrane increased to 125.9 and 132.6°, respectively. To further improve PVDF membrane hydrophobicity, a dual coagulation process was used and the mixed solvent (TEP–DMAc) was added into the first coagulation bath for 30 sec. Increase in the TEP–DMAc content led to the change in the morphology type of the membrane, that is, from an asymmetric structure with a dense top surface to a symmetric structure with a skinless top surface, and the pore size distribution widened greatly. By increasing the mass ratio of TEP to DMAc, the denseness of the membrane surface decreased significantly. Adding 60 wt% of TEP–DMAc to the first coagulation bath and the mass ratio of TEP to DMAc was 60:40, the CA reached to a maximum as high as 136.6°, and PVDF microporous membrane showed a high porosity of 80% and an excellent mechanical property of 3.14 MPa tensile strength and 61.79% elongation ratio. Copyright © 2009 John Wiley & Sons, Ltd. 相似文献
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用复分解的方法制备了辛酸钕[Nd(OCA)_3]和甲基丙烯酸钕[Nd(MAA)_3];将它们分别加入甲基丙烯酸甲酯和甲基丙烯酸的混合体系,聚合后得到交联的[含Nd(MAA)_3]和非交联的[含有Nd(OCA)_3]二种聚合物。研究了上述钕的有机酸盐和二种含钕聚合物的荧光性质。 相似文献