4.6 Article

Design of Novel POB/h-BN Co-Filled PTFE Composites with Enhanced Thermal-Mechanical Properties

期刊

CRYSTALS
卷 11, 期 7, 页码 -

出版社

MDPI
DOI: 10.3390/cryst11070778

关键词

polytetrafluoroethylene; microstructure; thermal resistance; h-BN flakes; dynamic thermomechanical analysis

资金

  1. National Natural Science Foundation of China [52005388]
  2. National Science and Technology Major Project [2019-VII-0007-0147]
  3. Collaborative Innovation Center of Advanced Control Valve Project [WZYB-XTCX-001]
  4. China Postdoctoral Science Foundation [2019M653598]
  5. Natural Science Foundation of Shaanxi Province [2019JQ-586, 2020JQ-911]

向作者/读者索取更多资源

The study found that PTFE composites filled with POB/h-BN show superior thermal-mechanical properties at high temperatures, thanks to their cross-linked reticulation structure and higher crystallinity.
Polytetrafluoroethylene (PTFE) is provided with excellent self-lubricating properties and corrosion resistance. However, the lower thermal resistance greatly limits its high-temperature applications. In the present work, two types of fillers with rigid organic polymers and submicron-sized inorganic hexagonal boron nitride (h-BN) were added to the PTFE matrix. The microstructure and thermal-mechanical properties of PTFE-based composites with different filler types or ratios were comparatively investigated. The results suggested that the polyphenyl ester (POB)/h-BN co-filled PTFE composites exhibited excellent thermal-mechanical properties compared with the polyimide (PI)/h-BN/PTFE materials at high temperature. The optimal ratios of POB and h-BN were 25 wt.% and 5 wt.%, respectively. The Vicat softening temperature of 25 wt.% POB/5 wt.% PI/PTFE composite increased by 41.3% compared to that of pure PTFE, which was due to the cross-linked reticulation structure with regularly distributed pores and higher crystallization degree. The storage modulus increased from 51.99 MPa to 685.76 MPa at 260 degrees C and reached 187.82 MPa at 320 degrees C. The uniform distribution of anisotropic orientation of the h-BN flakes showed an obvious pinning effect, and further improved the thermal-mechanical stability of POB/h-BN/PTFE composites.

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