Technical Institute of Physics and Chemistry, Chinese Academy of Sciences , 29 Zhongguancun East Road, Haidian District, Beijing 100190, China.
Institute of Chemistry, Chinese Academy of Sciences , 2 Zhongguancun North First Street, Haidian District, Beijing, 100190, China.
ACS Appl Mater Interfaces. 2017 Feb 8;9(5):4998-5005. doi: 10.1021/acsami.6b14895. Epub 2017 Jan 26.
Here, we describe an in situ approach for growing polyepoxides from the surfaces of graphene oxide (GO) using a surface-initiated polymerization reaction. The polymerization methodology is facile and general as a broad range of epoxides carrying various functional groups have been successfully polymerized by simply adding GO powders in the epoxide monomers. The resultant polyepoxide grafted GO are found to show enhanced dispersibility in various common solvents and to exhibit increased d-spacing between the basal planes. In particular, grafting poly(2,3-epoxy-1-propanol) (PEP) to GO results in a composite (i.e., GO-g-PEP) that is dispersible in water and miscible with polyether block amide, i.e., Pebax MH 1657. Preliminary studies have indicated the membranes prepared using Pebax/GO-g-PEP composites exhibit enhanced CO permeabilities and selectivities in comparison to H, O, or N. The excellent performance in gas separation is attributed to the layered structure of the GO-g-PEP sheets with enlarged d-spacing and the functional groups present on the PEP chains grafted to the surfaces of GO sheets.
在这里，我们描述了一种原位方法，通过表面引发聚合反应，从氧化石墨烯（GO）的表面生长聚环氧化物。聚合方法简单且通用，因为通过简单地将 GO 粉末加入环氧化物单体中，已经成功地聚合了带有各种官能团的广泛的环氧化物。所得的聚环氧化物接枝 GO 在各种常见溶剂中表现出增强的分散性，并表现出基平面之间的层间距增大。特别是，将聚（2,3-环氧-1-丙醇）（PEP）接枝到 GO 上，得到一种可分散在水中并与聚醚嵌段酰胺，即 Pebax MH 1657 混溶的复合材料（即 GO-g-PEP）。初步研究表明，与 H、O 或 N 相比，使用 Pebax/GO-g-PEP 复合材料制备的膜在 CO 渗透性和选择性方面表现出增强的性能。在气体分离方面的优异性能归因于具有增大的层间距的 GO-g-PEP 片层的层状结构以及接枝到 GO 片表面的 PEP 链上存在的官能团。
