Wang Ya-Chi, Huang Ting-Kai, Tung Shih-Huang, Wu Tzong-Ming, Lin Jiang-Jen
Institute of Polymer Science and Engineering, National Taiwan University, Taipei 10617, Taiwan.
Sci Rep. 2013;3:2621. doi: 10.1038/srep02621.
Polymeric composite films with a high loading of nano-size silicates can hardly meet the increasingly stringent fireproof and smoke-free requirements during burning. Thus, it is desirable to prepare pure clay films that can block air, heat, and flame. Here we report an organic-free clay film capable of both flame- and heat-shielding. The film was prepared from the self-assembly of nanometer-thick silicate platelets derived from the exfoliation of natural clays. The self-assembled film has a highly regular multilayered nanostructure over a large area and an appreciable volume of air entrapped in between. The combination of regular structure and substantial air volume contributes to the low thermal conductivity and flame blocking property of the film. It was demonstrated that the film can shield flame over hour duration and prevent temperature rising on the backside of film. This remarkable clay film has a myriad of uses including gas barrier, heat insulator, and fireproof devices.
高负载纳米尺寸硅酸盐的聚合物复合薄膜在燃烧过程中很难满足日益严格的防火和无烟要求。因此，制备能够阻隔空气、热量和火焰的纯粘土薄膜是很有必要的。在此，我们报道了一种兼具阻燃和隔热性能的无有机粘土薄膜。该薄膜由天然粘土剥离产生的纳米厚硅酸盐薄片自组装而成。自组装薄膜在大面积上具有高度规则的多层纳米结构，且其间 entrapped有可观的空气量。规则结构和大量空气量的结合有助于薄膜具有低导热性和阻火性能。结果表明，该薄膜能够在数小时内阻隔火焰，并防止薄膜背面温度升高。这种卓越的粘土薄膜有众多用途，包括气体阻隔、隔热和防火装置。
