Controlled surface modification of poly(methyl methacrylate) film by fluoroalkyl end-capped vinyltrimethoxysilane oligomeric silica/hexagonal boron nitride nanocomposites
Controlled surface modification of poly(methyl methacrylate) film by fluoroalkyl end-capped vinyltrimethoxysilane oligomeric silica/hexagonal boron nitride nanocomposites
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DOI：
10.1007/s11998-019-00261-y
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发表时间：
2019-10
影响因子：
2.3
通讯作者：
Jittraporn Saengkaew;T. Ogasawara;Katsumi Yamashita;S. Okada;Suwadee Kongparakul;M. Nishida;H. Sawada-H.-S
中科院分区：
文献类型：
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作者：
Jittraporn Saengkaew;T. Ogasawara;Katsumi Yamashita;S. Okada;Suwadee Kongparakul;M. Nishida;H. Sawada-H.-S
氟烷基封端的乙烯基三甲氧基硅烷低聚物[RF-（CH 2CHSi（OMe）3）n-RF;n= 2，3; RF= CF（CF 3）OC 3F 7]在六方氮化硼（h-BN）纳米粒子存在下，在碱性或酸性条件下，于室温下进行溶胶-凝胶反应，分别以良好的分离产率（~ 80%）得到相应的氟化低聚二氧化硅/h-BN纳米复合材料。由此获得的氟化低聚二氧化硅/h-BN纳米复合材料被发现对包括水的传统有机介质表现出良好的相容性。将这两种含氟纳米复合材料应用于聚甲基丙烯酸甲酯（PMMA）的表面改性。在碱性条件下制备的氟化纳米复合材料不仅可以给出由复合材料中较长的氟烷基赋予的良好的疏油特性，而且还可以给出与改性PMMA膜的唯一表面侧上的h-BN的存在相关的较高的荧光发射。相比之下，在酸性条件下制备的氟化纳米复合材料可以在PMMA膜的表面甚至反面提供良好的疏油特性和更高的荧光发射。这种独特的控制表面改性能力将讨论通过29 Si固态NMR谱这两种类型的n-RF/h-BN n-RF/h-BN纳米复合材料，这是在碱性或酸性条件下制备的PMMA膜的表面排列。
AbstractFluoroalkyl end-capped vinyltrimethoxysilane oligomer [RF-(CH2CHSi(OMe)3)n-RF;n= 2, 3; RF= CF(CF3)OC3F7] undergoes sol–gel reactions in the presence of hexagonal boron nitride (h-BN) nanoparticles under alkaline or acidic conditions at room temperature to afford the corresponding fluorinated oligomeric silica/h-BN nanocomposites in good isolated yields (~ 80%), respectively. The fluorinated oligomeric silica/h-BN nanocomposites thus obtained were found to exhibit a good dispersibility toward the traditional organic media including water. These two kinds of fluorinated nanocomposites were applied to the surface modification of poly(methyl methacrylate) (PMMA). The fluorinated nanocomposites prepared under alkaline conditions can give not only a good oleophobic characteristic imparted by longer fluoroalkyl groups in the composites but also the higher fluorescent emission related to the presence of h-BN on the only surface side of the modified PMMA film. In contrast, the fluorinated nanocomposites prepared under acidic conditions can provide a good oleophobic characteristic and a higher fluorescent emission on both the surface and even on the reverse side of the PMMA film. Such unique controlled surface modification ability will be discussed by29Si solid-state NMR spectra of these two types of the nanocomposites.Graphic abstractSurface arrangement of the RF-(VM-SiO2)n-RF/h-BN nanocomposites, which were prepared under alkaline or acidic conditions, toward the PMMA film.