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Hu T, Ye H, Luo Z, Ma J, Zhang B, Zhang X, Song J, Wang Q, Xu L. Efficient exfoliation of UV-curable, high-quality graphene from graphite in common low-boiling-point organic solvents with a designer hyperbranched polyethylene copolymer and their applications in electrothermal heaters. J Colloid Interface Sci 2020; 569:114-127. [PMID: 32105899 DOI: 10.1016/j.jcis.2020.02.068] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2020] [Revised: 02/11/2020] [Accepted: 02/16/2020] [Indexed: 10/25/2022]
Abstract
The use of stabilizer with designer structures can effectively promote graphite exfoliation in common solvents to render functionalized graphene desirable for their various applications. Herein, a hyperbranched polyethylene copolymer, HBPE@Py@Acryl, simultaneously bearing multiple pyrene terminal groups and pendant acryloyl moieties has been successfully synthesized from ethylene with a Pd-diimine catalyst based on unique chain walking mechanism. The unique structural design of the HBPE@Py@Acryl makes it capable of effectively promote graphite exfoliation in a series of common, low-boiling-point organic solvents, e.g. CHCl3, to render stable graphene dispersions with concentrations effectively adjustable by changing feed concentrations of graphite and polymer or sonication time. Meanwhile, it can be irreversibly adsorbed on the exfoliated graphene surface based on the π-π interactions between them to concurrently render acryloyl-functionalized graphene free of structural defects, with majority (92.7%) of them having a thickness of 2-3 layers. This allows us to obtain graphene electrothermal films simply by filtration and UV irradiation, which exhibit outstanding stability in use. The action mechanism of the HBPE@Py@Acryl as stabilizer for promoting graphite exfoliation and the role of UV irradiation on improving the stability in use of resulting graphene films have been elucidated.
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Affiliation(s)
- Te Hu
- College of Materials Science and Engineering, Zhejiang University of Technology, Hangzhou 310014, China
| | - Huijian Ye
- College of Materials Science and Engineering, Zhejiang University of Technology, Hangzhou 310014, China; Pinghu Institute of Advanced Materials, Zhejiang University of Technology, Pinghu 314212, China.
| | - Zhenggang Luo
- College of Materials Science and Engineering, Zhejiang University of Technology, Hangzhou 310014, China
| | - Junjie Ma
- College of Materials Science and Engineering, Zhejiang University of Technology, Hangzhou 310014, China
| | - Boyuan Zhang
- College of Materials Science and Engineering, Zhejiang University of Technology, Hangzhou 310014, China
| | - Xuanhe Zhang
- College of Materials Science and Engineering, Zhejiang University of Technology, Hangzhou 310014, China
| | - Jinwei Song
- College of Materials Science and Engineering, Zhejiang University of Technology, Hangzhou 310014, China
| | - Qingping Wang
- College of Materials Science and Engineering, Zhejiang University of Technology, Hangzhou 310014, China
| | - Lixin Xu
- College of Materials Science and Engineering, Zhejiang University of Technology, Hangzhou 310014, China; Pinghu Institute of Advanced Materials, Zhejiang University of Technology, Pinghu 314212, China.
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