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Issue 41, 2019
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EG/TPU composites with enhanced flame retardancy and mechanical properties prepared by microlayer coextrusion technology

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Abstract

In this work, expandable graphite (EG)/thermoplastic polyurethane (TPU) composites with excellent exfoliation, dispersion and two-dimensional plane orientation of the EG fillers were manufactured by microlayer coextrusion technology. The influence of microlayer coextrusion technology on flame retardancy and mechanical properties of microlayer coextruded composites was investigated. The exfoliation, dispersion and orientation of the EG fillers in TPU matrix were characterized by SEM and XRD. The flame retardancy and thermal stability of the composites were characterized by UL 94, LOI, TGA and CCT. The mechanical properties of the composites were characterized by tensile tests. SEM and XRD showed that microlayer coextrusion technology could not only greatly promote exfoliation and dispersion of the EG fillers in TPU matrix, but also could enhance the two-dimensional plane orientation of the EG fillers in TPU matrix. As compared with the conventional blended composites, the microlayer coextruded composites showed enhanced flame retardancy and mechanical properties, with 15 wt% of EG, the as prepared EG/TPU composites showed a V-0 flame retardance level, whereas EG/TPU composite prepared by conventional blending only showed a V-2 flame retardance level. The exfoliation, dispersion and two-dimensional plane orientation of the EG fillers in TPU matrix were believed to play a critical role in the improvement of flame retardancy. The significance of this research was providing a new feasible idea to fabricate flame retardant composites with excellent mechanical properties.

Graphical abstract: EG/TPU composites with enhanced flame retardancy and mechanical properties prepared by microlayer coextrusion technology

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Publication details

The article was received on 15 May 2019, accepted on 25 Jul 2019 and first published on 01 Aug 2019


Article type: Paper
DOI: 10.1039/C9RA03653A
RSC Adv., 2019,9, 23944-23956
  • Open access: Creative Commons BY-NC license
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    EG/TPU composites with enhanced flame retardancy and mechanical properties prepared by microlayer coextrusion technology

    C. Zhang, M. Shi, Y. Zhang, W. Yang, Z. Jiao and L. Yang, RSC Adv., 2019, 9, 23944
    DOI: 10.1039/C9RA03653A

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