Silica/perfluoropolymer nanocomposites fabricated by direct melt-compounding: A novel method without surface modification on nano-silica
Silica/perfluoropolymer nanocomposites fabricated by direct melt-compounding: A novel method without surface modification on nano-silica
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DOI：
10.1166/jnn.2007.425
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发表时间：
2007-07-01
影响因子：
--
通讯作者：
Takeda, Kunihiko
中科院分区：
文献类型：
--
作者：
Tanahashi, Mitsuru;Hirose, Masaki;Takeda, Kunihiko
研究了一种制备二氧化硅/全氟聚合物纳米复合材料的新方法，即在直接熔融复合过程中，通过机械击穿低断裂强度的二氧化硅纳米颗粒松散堆积在聚合物熔体中，使未经表面改性的纳米二氧化硅颗粒均匀分散。该方法由两个阶段组成。第一阶段包括制备松散的二氧化硅团聚体，第二阶段包括完全疏水的全氟聚合物poly(tetrafluoroethyleneco-perfluoropropylvinylether)，与第一阶段制备的松散二氧化硅团聚体的熔融复合。在第一阶段，通过控制pH和加盐使平均初始直径为190 nm的胶体二氧化硅水溶液不稳定，从而控制二氧化硅团聚体的堆积结构和断裂强度。在下一阶段，利用熔融复合过程中聚合物熔体内部的剪切力，将制备的低断裂强度的疏松二氧化硅团聚体分解，制备出二氧化硅/全氟聚合物纳米复合材料。
A novel method for the fabrication of silica/perfluoropolymer nanocomposites was investigated, whereby nano-sized silica particles without surface modification were dispersed uniformly through mechanical breakdown of loosely packed agglomerates of silica nanoparticles with low fracture strength in a polymer melt during direct melt-compounding. The method consists of two stages. The first stage involves preparation of the loose silica agglomerate, and the second stage involves melt-compounding of a completely hydrophobic perfluoropolymer, poly(tetrafluoroethyleneco-perfluoropropylvinylether), with the loose silica agglomerates prepared in the first stage. In the first stage, the packing structure and the fracture strength of the silica agglomerate were controlled by destabilizing an aqueous colloidal silica solution with a mean primary diameter of 190 nm via pH control and salt addition. In the next stage, the silica/perfluoropolymer nanocomposite was fabricated by breaking down the prepared loose silica agglomerates with low fracture strength by means of a shear force inside the polymer melt during melt-compounding.