Properties of thermoplastic polyurethane composites modified with carbon nanotubes

doi:10.19491/j.issn.1001-9278.2022.06.001

Abstract

Abstract:

In this work， the surface of carbon nanotubes （CNTs） was treated with a mixed solution of sulfuric acid （H₂SO₄）/nitric acid （HNO₃）， and then thermoplastic polyurethane （TPU） composites were prepared through melt blending using the modified CNTs as a raw material. The effects of CNTs content on the rheological， mechanical， wear?resistant， and thermal properties of the composites were investigated. The experimental results indicated the modified CNTs exhibited a good dispersibility in the TPU matrix due to the good compatibility between the filler and matrix. The TPU/CNTs composite retained a good processing fluidity under high?frequency shearing， and their tensile strength and wear resistance are significantly enhanced compared to pure TPU. This modification effect was especially significant for the composites with a low content of modified CNTs. The mechanical properties of the composites were improved significantly. Differential scanning calorimetry analysis results indicated that the addition of modified CNTs improved the melting temperature and crystalline level of the TPU matrix. Thermogravimetric analysis results indicated that the addition of modified CNTs improved the thermal degradation temperature and thermal stability of the composites.

Key words: carbon nanotubes, thermoplastic polyurethane, rheological behavior, thermal performance, mechanical property

CLC Number:

TQ323.8

LI Kaize, XIN Yong. Properties of thermoplastic polyurethane composites modified with carbon nanotubes[J]. China Plastics, 2022, 36(6): 1-5.

Figures/Tables 6

Fig.1. Cross?sectional morphologies of TPU/2 wt%CNTs composites

Fig.2. Rheological behavior of TPU/CNTs composite

Fig.3. Mechanical properties of TPU/CNTs composite

Fig.4. Wear loss of pure TPU and TPU/CNTs composites with different mass fractions under different loads

Fig.5. DSC heating curves of pure TPU and TPU/CNTs composites with different mass fractions

Fig.6. TGA and DTG curves of pure TPU and TPU/CNTs composites with different mass fractions

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