Journal
POLYMERS
Volume 11, Issue 8, Pages -Publisher
MDPI
DOI: 10.3390/polym11081340
Keywords
thermal resistance; thermal conductivity; boron nitride; hybrid
Categories
Funding
- National Natural Science Foundation of China [51603029, 51773028]
- China Postdoctoral Science Foundation [2017M623001]
- National Postdoctoral Program for Innovative Talents [BX201700044]
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Excellent thermal resistance and thermal conductivity are preconditions of materials to be used at elevated temperatures. Herein, boron nitride and polyarylene ether nitrile hybrids (PEN-g-BN) with excellent thermal resistance and thermal conductivity are fabricated. Phthalonitrile-modified BN (BN-CN) is prepared by reacting hydroxylated BN with isophorone diisocyanate (IPDI) and 3-aminophxylphthalonitrile (3-APN), and then characterized by FT-IR, UV-Vis, and X-ray photoelectron spectroscopy (XPS). The obtained BN-CN is introduced to a phthalonitrile end-capped PEN (PEN-Ph) matrix to prepare BN-CN/PEN composites. After curing at 340 degrees C for 4 h, PEN-g-BN hybrids are fabricated by a self-crosslinking reaction of cyano groups (-CN) from BN-CN and PEN-Ph. The fabricated PEN-g-BN hybrids are confirmed through FT-IR, UV-Vis, SEM and gel content measurements. The PEN-g-BN hybrids demonstrate excellent thermal resistance with their glass transition temperature (T-g) and decomposition temperatures (T-d) being higher than 235 degrees C and 530 degrees C, respectively. Additionally, the thermal conductivity of the prepared PEN-g-BN hybrids is up to 0.74 W/(mk), intensifying competitiveness of PEN-g-BN hybrids for applications at elevated temperatures.
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