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TANG Qi, HU Shiteng, WANG Xuemeng, et al. Preparation of multi-walled carbon nanotubes@graphene/thermoplastic vulcanizate composites and study on its thermoelectric properties[J]. Acta Materiae Compositae Sinica, 2023, 40(7): 3928-3938. DOI: 10.13801/j.cnki.fhclxb.20220919.002
Citation: TANG Qi, HU Shiteng, WANG Xuemeng, et al. Preparation of multi-walled carbon nanotubes@graphene/thermoplastic vulcanizate composites and study on its thermoelectric properties[J]. Acta Materiae Compositae Sinica, 2023, 40(7): 3928-3938. DOI: 10.13801/j.cnki.fhclxb.20220919.002
shu

Preparation of multi-walled carbon nanotubes@graphene/thermoplastic vulcanizate composites and study on its thermoelectric properties

  • 1.

    School of Polymer Science and Engineering, Qingdao University of Science and Technology, Qingdao 266042, China

  • 2.

    Key Laboratory of Rubber-Plastics of Ministry of Education, Qingdao 266042, China

Funds: Applied Research Project Supported by Qingdao Postdoctoral Research Center in 2021 (040304031060092)
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  • Received Date: August 10, 2022
  • Revised Date: September 06, 2022
  • Accepted Date: September 09, 2022
  • Available Online: September 21, 2022
    Abstract
  • This work mainly used the synergistic effect of one- and two-dimensional fillers (Multi-walled carbon nanotubes (MWCNTs)@graphene (GE)) to improve the thermoelectric and mechanical properties of thermoplastic vulcanizate (TPV). MWCNTs@GE/polypropylene-maleic anhydride (PP-MA) masterbatch were first prepared by melt-graft blending. The structure, crystallinity and microstructure of MWCNTs@GE/PP-MA masterbatch were characterized. Then MWCNTs@GE/TPV composites with unique network structure were prepared by dynamic vulcanization method. The effects of the amount of MWCNTs@GE on the phase structure, electrical conductivity, thermal conductivity and mechanical properties of MWCNTs@GE/TPV composites were studied. The results show that the combination of MWCNTs and GE has a synergistic effect and can be used as nucleating agent to improve crystallization peak temperature (Tc) and crystallinity of PP (Xc) and reduce crystal size of the PP crystal plane (LCrystallite) in the crystallization process, compared with the masterbatch prepared with single filler. In the MWCNTs@GE/PP-MA masterbatch, MWCNTs and GE are uniformly dispersed in PP-MA and have strong bonding force with the matrix. The MWCNTs@GE/TPV composites show an obvious "island" structure, and the cross-linked butyl rubber (IIR) rubber is dispersed in the PP-MA phase as micron size particles. MWCNTs and GE are uniformly dispersed in the continuous phase PP-MA, and the distance between MWCNTs and GE is less than 1 µm, forming the MWCNTs@GE network structure. When the content of MWCNTs@GE in MWCNTs@GE/TPV composites reaches 3wt%, the alternating current (AC) electrical conductivity, thermal conductivity, elongation at break and tensile strength reach the best value.
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