Issue 54, 2020, Issue in Progress
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RSC Advances

Correlation between microstructure and properties of graphene oxide/waterborne polyurethane composites investigated by positron annihilation spectroscopy

Xiaobing Han,a   Jie Gao, ORCID logo *a   Zhiyuan Chen,a   Xiuqin Tang,a   Yuan Zhaoa  and  Tao Chen*a  

* Corresponding authors

a Hubei Key Laboratory of Radiation Chemistry and Functional Materials, Hubei Collaboration Innovative Center for Nonpower Nuclear Technology, School of Nuclear Technology and Chemistry & Biology, Hubei University of Science and Technology, Xianning 437100, China
E-mail: gaojie2019@hbust.edu.cn, taochen518@163.com

Abstract

A quantitative description of microstructure is highly desirable for the precise construction of high performance graphene based polymer composites. In this paper, the effects of doping graphene oxide (GO) on the microstructure, thermal and mechanical properties of the obtained graphene oxide/waterborne polyurethane (GO/WPU) composites were systematically investigated. In order to give a deep insight into the microstructure of GO/WPU composites, especially for the relative free volume fraction (fr) and interfacial interaction intensity (β), positron annihilation lifetime spectroscopy (PALS) was employed for its quantitative characterization. With the increase of GO content, the fr decreased first and then increased, the lowest value was observed for the composites containing 0.5 wt% GO. This can be ascribed to the change in the dispersed state of GO and interfacial interactions, which agree well with the results of SEM. The correlation between microstructure and properties was established with the PALS results, the values of fr and β give a good explanation of the variation in glass transition temperature and tensile strength, respectively.

Graphical abstract: Correlation between microstructure and properties of graphene oxide/waterborne polyurethane composites investigated by positron annihilation spectroscopy

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Article information

DOI
https://doi.org/10.1039/D0RA05872F
Article type
Paper
Submitted
06 Jul 2020
Accepted
25 Aug 2020
First published
01 Sep 2020
This article is Open Access
Creative Commons BY-NC license

RSC Adv., 2020,10, 32436-32442

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Correlation between microstructure and properties of graphene oxide/waterborne polyurethane composites investigated by positron annihilation spectroscopy

X. Han, J. Gao, Z. Chen, X. Tang, Y. Zhao and T. Chen, RSC Adv., 2020, 10, 32436 DOI: 10.1039/D0RA05872F

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