Center for Macromolecular Engineering, Department of Chemistry, Carnegie Mellon University, 4400 Fifth Avenue, Pittsburgh, Pennsylvania 15213, USA.
ACS Appl Mater Interfaces. 2010 Sep;2(9):2475-80. doi: 10.1021/am100463z.
Thermocurable hyperbranched polystyrenes were successfully synthesized using atom transfer radical polymerization and exhibited superior ultrathin film formation capabilities in comparison with the linear analogues, as assessed by the minimal film thickness attainable by spin-coating without dewetting. They were suitable as ultrathin film organic dielectrics, with parallel plate specific capacitances as high as ∼680 nF/cm2. Similar to high performance inorganic dielectrics, capacitance measurements pointed to the presence of "dead" interfacial capacitance, which could be accounted for by considering the geometric effect of roughness "incommensurability" between metal electrode and polymer film.
热固性超支化聚苯乙烯成功地通过原子转移自由基聚合合成，并通过旋涂不发生去湿的最小可达到的薄膜厚度评估，显示出与线性类似物相比优越的超薄薄膜形成能力。它们适合作为超薄薄膜有机电介质，具有高达约 680 nF/cm2 的平行板比电容。与高性能无机电介质类似，电容测量表明存在“死”界面电容，可以通过考虑金属电极和聚合物薄膜之间的粗糙度“不匹配”的几何效应来解释。
