Latex co-coagulation approach to fabrication of polyurethane/graphene nanocomposites with improved electrical conductivity, thermal conductivity, and barrier property
| Autor: | Sheng Li Wu, Li Yuan Zhang, Tie Jun Shi |
|---|---|
| Rok vydání: | 2015 |
| Předmět: |
chemistry.chemical_classification
Nanocomposite Materials science Polymers and Plastics Scanning electron microscope Graphene Oxide 02 engineering and technology General Chemistry Polymer 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Surfaces Coatings and Films law.invention chemistry.chemical_compound Thermal conductivity chemistry Transmission electron microscopy law Materials Chemistry Composite material 0210 nano-technology Dispersion (chemistry) |
| Zdroj: | Journal of Applied Polymer Science. 133 |
| ISSN: | 0021-8995 |
| DOI: | 10.1002/app.43117 |
| Popis: | 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 cm3 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. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016, 133, 43117. |
| Databáze: | OpenAIRE |
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