Crystallization of UHMWPE nanocomposites filled by multi-wall carbon nanotubes
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Crystallization of UHMWPE nanocomposites filled by multi‑wall carbon nanotubes Wu Zexiong1 · Li Anqi1 · Zhang Zishou1 · Mai Kancheng1 Received: 30 January 2019 / Accepted: 4 August 2020 © Akadémiai Kiadó, Budapest, Hungary 2020
Abstract In order to study the effect of MWCNTs on the crystallization of UHMWPE, the UHMWPE nanocomposites filled by MWCNTs with high content were prepared by solution method. The non-isothermal and isothermal crystallization of MWCNTs/ UHMWPE nanocomposites were studied by differential scanning calorimetry and X-ray diffraction. The results showed that the heterogeneous nucleation of MWCNTs increases the crystallization temperature and crystallinity of UHMWPE filled by MWCNTs below 40 mass% with the increase in MWCNTs content in the non-isothermal crystallization process. However, addition of MWCNTs above 40 mass% reduces the crystallization temperature and crystallinity of UHMWPE with the increase in MWCNTs content. The crystallization kinetics of UHMWPE nanocomposites filled by high MWCNTs content can be described by Jeziorny, Mo and Avrami model. The increase in MWCNTs content decreases the crystallization rate of UHMWPE in the non-isothermal crystallization process. For the isothermal crystallization process, although addition of MWCNTs increases the crystallization rate of UHMWPE, the crystallization rate of UHMWPE also decreases with the increase in MWCNTs content. Above results are discussed based on the combined action of heterogeneous nucleation of MWCNTs and the macromolecular chains of UHMWPE confined on the surface of MWCNTs. Keywords UHMWPE · MWCNTs · Crystallization · DSC
Introduction In order to improve the physical and mechanical properties of ultrahigh molecular weight polyethylene (UHMWPE) to expand the application of UHMWPE, the MWCNTs, carbon black, graphite, grapheme and other fillers were widely used as reinforcements. The preparation [1–3], mechanical properties [4–6], electrical properties [7–9], tribological properties [10–12], thermal properties [13, 14] of UHMWPE nanocomposites filled by MWCNTs have been investigated.
* Zhang Zishou [email protected] * Mai Kancheng [email protected] 1
Key Laboratory of Polymeric Composites and Functional Materials of Ministry of Education, Guangdong Provincial Key Laboratory for High Performance Polymer‑based Composites, Materials Science Institute, School of Chemistry, Sun Yat-sen University, Guangzhou 510275, People’s Republic of China
Investigation on our previous work indicated that the MWCNTs/UHMWPE nanocomposites with high content of MWCNTs, high conductivity and mechanical property can be prepared by a solution mixing and followed by hotpressing method [15]. Because the physical and mechanical properties of UHMWPE depend on the changes in the crystallization behavior, crystal morphology and crystallinity of UHMWPE [16–19], crystallization of UHMWPE nanocomposites filled by MWCNTs with different contents was compared in this work. Sattari et al. [20] investigated the crystallization of UHMWPE nanocompos
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