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首页> 外文期刊>Polymers >Embedding of Hollow Polymer Microspheres with Hydrophilic Shell in Nafion Matrix as Proton and Water Micro-Reservoir
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Embedding of Hollow Polymer Microspheres with Hydrophilic Shell in Nafion Matrix as Proton and Water Micro-Reservoir

机译：带有亲水壳的空心聚合物微球在质子和水微储层的Nafion基质中的嵌入

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Assimilating hydrophilic hollow polymer spheres (HPS) into Nafion matrix by a loading of 0.5 wt % led to a restructured hydrophilic channel, composed of the pendant sulfonic acid groups (–SO3H) and the imbedded hydrophilic hollow spheres. The tiny hydrophilic hollow chamber was critical to retaining moisture and facilitating proton transfer in the composite membranes. To obtain such a tiny cavity structure, the synthesis included selective generation of a hydrophilic polymer shell on silica microsphere template and the subsequent removal of the template by etching. The hydrophilic HPS (100–200 nm) possessed two different spherical shells, the styrenic network with pendant sulfonic acid groups and with methacrylic acid groups, respectively. By behaving as microreservoirs of water, the hydrophilic HPS promoted the Grotthus mechanism and, hence, enhanced proton transport efficiency through the inter-sphere path. In addition, the HPS with the –SO3H borne shell played a more effective role than those with the –CO2H borne shell in augmenting proton transport, in particular under low humidity or at medium temperatures. Single H2-PEMFC test at 70 °C using dry H2/O2 further verified the impactful role of hydrophilic HPS in sustaining higher proton flux as compared to pristine Nafion membrane.
机译：以0.5 wt％的负载量将亲水空心聚合物球（HPS）吸收到Nafion基质中，从而导致重组的亲水通道，该通道由侧基磺酸基团（–SO 3 H）和嵌入的亲水空心组成领域。微小的亲水中空室对于保持水分和促进质子在复合膜中的转移至关重要。为了获得这种微小的空腔结构，合成过程包括在二氧化硅微球模板上选择性生成亲水聚合物壳，然后通过蚀刻去除模板。亲水性HPS（100-200 nm）具有两个不同的球形壳，分别带有侧链磺酸基团和甲基丙烯酸基团的苯乙烯网络。通过表现为水的微储库，亲水性HPS促进了Grotthus机理，因此提高了通​​过球间路径的质子传输效率。此外，带有–SO 3 H携带壳的HPS在增强质子传输方面，特别是在–CO 2 H携带壳的HPS中，起着更有效的作用。低湿度或中等温度。在70°C下使用干燥的H 2 / O 2 进行的单个H 2 -PEMFC测试进一步证明了亲水性HPS在维持较高质子方面的影响与原始Nafion膜相比的通量。

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