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Graphene oxide‐containing isocyanate‐based polyimide foams: Enhanced thermal stability and flame retardancy
Author(s) -
Çakir Mustafa,
Kılıç Volkan,
Boztoprak Yalçın,
Özmen Fadime Karaer
Publication year - 2021
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.51012
Subject(s) - polyimide , graphene , oxide , isocyanate , pyromellitic dianhydride , materials science , thermal stability , polymer chemistry , polymer , chemical engineering , prepolymer , polyurethane , composite material , nanotechnology , layer (electronics) , engineering , metallurgy
Isocyanate‐based graphene oxide‐containing polyimide foams were synthesized by a semi‐prepolymer method. In this method, while the first solution containing pre‐polymer was derived from pyromellitic dianhydride and excess polymethylene polyphenylene isocyanate (PM200), the second solution contains dianhydride derivatives, water, catalysts, surfactants, and graphene oxide. PIFs were prepared with 0%, 0.25%, 0.50%, 0.75%, and 1% graphene oxide by weight, respectively. PIFs exhibited a minimum side reaction and urea generation was not seen for all PIFs instead of imide bonding. The addition of graphene oxide (GO) leads to a more close‐packed structure. Therefore, crosslinking density and thermal stability of graphene oxide‐containing polyimide foams increased. Upon the addition of 1% GO, almost seven times higher compression strength was obtained compared to neat PIFs. Also, LOI values supported the theory that thermally stable and flame retardant PIFs can be synthesized via the isocyanate‐based process with GO.