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Radical polymerization of capillary bridges between micron-sized particles in liquid bulk phase as a low temperature route to produce porous solid materials

机译：液相本体相中微米级颗粒之间的毛细管桥的自由基聚合作为低温途径生产多孔固体材料

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We present a generic and versatile low temperature route to produce macro-porous bodies with porosity and pore size distribution that are adjustable in a wide range. Capillary suspensions, where the minor fluid is a monomer, are used as pre-cursors. The monomer is preferentially located between the particles, creating capillary bridges, resulting in a strong, percolating network. Thermally induced polymerization of these bridges at temperatures below 100 °C for less than 5 hours and subsequent removal of the bulk fluid yields macroscopic, self-supporting solid bodies with high porosity. This process is demonstrated using methylmethacrylate and hydroxyethylmethacrlyate with glass particles as a model system. The produced PMMA had a molecular weight of about 500.000 g/mol and dispersity about three. Application specific porous bodies, including PMMA particles connected by PMMA bridges, micron-sized capsules containing phase change material with high inner surface, and porous graphite membranes with high electrical conductivity, are also shown.
机译：我们提出了一种通用且用途广泛的低温途径，以生产孔隙率和孔径分布可在大范围内调节的大孔体。毛细管悬浮液（其中次要流体为单体）用作前体。单体优先位于颗粒之间，形成毛细管桥，从而形成牢固的渗透网络。在低于100°C的温度下，这些桥的热引发聚合反应少于5个小时，随后除去大量流体，即可得到具有高孔隙率的宏观自支撑固体。使用甲基丙烯酸甲酯和甲基丙烯酸羟乙酯与玻璃颗粒作为模型系统，可以证明这一过程。产生的PMMA具有约500,000g / mol的分子量和约3的分散度。还显示了专用多孔体，包括通过PMMA桥连接的PMMA颗粒，包含内表面高的相变材料的微米级胶囊以及具有高电导率的多孔石墨膜。

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