Highly aligned,ultralarge-size reduced graphene oxide/polyurethane nanocomposites: Mechanical properties and moisture permeability |
| |
| Affiliation: | 1. Department of Mechanical Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong;2. Department of Polymer Engineering and Color Technology, Amirkabir University of Technology, 424 Hafez Ave., Tehran, Iran;1. School of Materials Science and Engineering, Tianjin University, PR China;2. Collaborative Innovation Center of Chemical Science and Engineering, Tianjin, PR China;3. Key Laboratory of Advanced Ceramics and Machining Technology, Ministry of Education, PR China;4. Tianjin Key Laboratory of Composite and Functional Materials, Tianjin 300072, PR China;1. College of Polymer Science and Engineering and State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu 610065, PR China;2. Institute of Printing and Packaging Engineering, Xi?an University of Technology, Xi?an, Shanxi 710048, PR China;3. Department of Chemistry, Stony Brook University, Stony Brook, NY 11794-3400, USA;1. Institute of Polymeric Materials, Sahand University of Technology, P.O. Box 51335-1996, Tabriz, Iran;2. Department of Polymer Engineering, Sahand University of Technology, P.O. Box 51335-1996, Tabriz, Iran;1. Key Laboratory of Rubber-Plastics, Ministry of Education/Shandong Provincial Key Laboratory of Rubber-Plastics, Qingdao University of Science & Technology, Qingdao City 266042, People’s Republic of China;2. Department of Mechanical Engineering, University of Delaware, Newark, DE 19716, USA;3. Key Laboratory of High Performance fibers & products, Ministry of Education, College of Science, State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai, China;1. Biomedical Engineering Department, Amirkabir University of Technology (Tehran Polytechnic), Tehran, Iran;2. Polymer Engineering and Color Technology Department, Amirkabir University of Technology (Tehran Polytechnic), Tehran, Iran;3. Nanotechnology and Regenerative Medicine Centre (Ltd), The London BioScience Innovation Centre, London, UK |
| |
| Abstract: | Polyurethane (PU) nanocomposite films containing highly-aligned graphene sheets are produced. Aqueous dispersion of ultralarge-size graphene oxide (GO) is in situ reduced in waterborne polyurethane, resulting in fine dispersion and high degree of orientation of graphene sheets, especially at high graphene contents. The PU/reduced GO nanocomposites present remarkable 21- and 9-fold increases in tensile modulus and strength, respectively, with 3 wt.% graphene content. The agreement between the experiments and theoretical predictions for tensile modulus proves that the graphene sheets are indeed dispersed individually on the molecular scale and oriented in the polymer matrix to form a layered structure. The moisture permeability of the nanocomposites presents a systematic decrease with increasing graphene content, clearly indicating the impermeable graphene sheets acting as moisture barrier. The synergy arising from the very high aspect ratio and horizontal alignment of the graphene sheets is responsible for this finding. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
