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

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...

Full description

Saved in:
Bibliographic Details
Published in:Crystals (Basel) 2021-07, Vol.11 (7), p.778
Main Authors: Wang, Yu, Liu, Qi, Bai, Yu, Liu, Haibo, He, Tao, Jia, Hua, Chang, Zhandong, Liu, Xin, Su, Haixia, Ma, Yushan
Format: Article
Language:English
Subjects:
Boron nitride
Composite materials
Corrosion resistance
Crystallization
dynamic thermomechanical analysis
Fillers
h-BN flakes
High temperature
Lubricating properties
Mechanical properties
microstructure
Morphology
Polyimide resins
Polymers
Polytetrafluoroethylene
Self lubrication
Sintering
Storage modulus
Thermal resistance
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary: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 °C and reached 187.82 MPa at 320 °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.
ISSN:2073-4352
2073-4352
DOI:10.3390/cryst11070778