• 文献标题:   Latex co-coagulation approach to fabrication of polyurethane/graphene nanocomposites with improved electrical conductivity, thermal conductivity, and barrier property
  • 文献类型:   Article
  • 作  者:   WU SL, SHI TJ, ZHANG LY
  • 作者关键词:   composite, graphene fullerene, polyurethane, surfaces interface, synthesis processing
  • 出版物名称:   JOURNAL OF APPLIED POLYMER SCIENCE
  • ISSN:   0021-8995 EI 1097-4628
  • 通讯作者地址:   Hefei Univ Technol
  • 被引频次:   7
  • DOI:   10.1002/APP.43117
  • 出版年:   2016

▎ 摘  要

This study describes a simple and effective method of synthesis of a polyurethane/graphene nanocomposite. Cationic waterborne polyurethane (CWPU) was used as the polymer matrix, and graphene oxide (GO) as a starting nanofiller. The CWPU/ GO nanocomposite was prepared by first mixing a CWPU emulsion with a GO colloidal dispersion. The positively charged CWPU latex particles were assembled on the surfaces of the negatively charged GO nanoplatelets through electrostatic interactions. Then, the CWPU/chemically reduced GO (RGO) was obtained by treating the CWPU/GO with hydrazine hydrate in DMF. The results of X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM), and Raman analysis showed that the RGO nanoplatelets were well dispersed and exfoliated in the CWPU matrix. The electrical conductivity of the CWPU/RGO nanocomposite could reach 0.28 S m(-1), and the thermal conductivity was as high as 1.71 W m(-1) K-1. The oxygen transmission rate (OTR) of the CWPU/RGO-coated PET film was significantly decreased to 0.6 cm(3) m(-2) day(-1), indicating a high oxygen barrier property. This remarkable improvement in the electrical and thermal conductivity and barrier property of the CWPU/RGO nanocomposite is attributed to the electrostatic interactions and the molecular-level dispersion of RGO nanoplatelets in the CWPU matrix. (c) 2015 Wiley Periodicals, Inc.