Abstract In this study, a polystyrene-block-polyisoprene-block-polystyrene (SIS) based dielectric paste was fabricated using barium titanate (BT) as dielectric filler in order to produce organic-inorganic composites for 3D dispenser printing applications. Since a high loading of inorganic filler is generally required to obtain high dielectric properties, the surface of BT was modified with two different phosphonic acids having functional groups resembling the groups contained in the block copolymer, in order to achieve a high compatibility between the filler and the polymer matrix. Upon incorporation of 80 wt% of BT in SIS, the dielectric constant was found to be approximately 3 times higher than that of bare SIS. The surface modification of the filler enhanced its dispersion within the polymer matrix, as confirmed by the surface morphology of the composite film at a high filler content. The desired viscoelasticity was achieved through the fine-tuning of the total solid content, and consequently, the potential application of the composite as 3D printable paste was demonstrated through the formation of a layer-by-layer printed structure on a flexible substrate.

中文翻译：

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具有表面改性 BaTiO 3 的 3D 可打印高介电浆料的粘弹性

摘要 在这项研究中，使用钛酸钡 (BT) 作为介电填料制备了基于聚苯乙烯-嵌段-聚异戊二烯-嵌段-聚苯乙烯 (SIS) 的介电浆料，以生产用于 3D 分配器打印应用的有机-无机复合材料。由于通常需要大量的无机填料来获得高介电性能，BT 的表面用两种不同的膦酸改性，这些膦酸的官能团类似于嵌段共聚物中包含的基团，以实现填料和聚合物基质。在 SIS 中加入 80 wt% 的 BT 后，发现介电常数比裸 SIS 高约 3 倍。填料的表面改性增强了其在聚合物基体中的分散，正如在高填料含量下复合膜的表面形态所证实的那样。所需的粘弹性是通过微调总固体含量来实现的，因此，通过在柔性基板上形成逐层打印结构，证明了复合材料作为 3D 可打印糊剂的潜在应用。