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The preparation and thermomechanical properties of high‐temperature foams based on thermoplastic poly(phthalazinone ether ketone)
Author(s) -
Yang Junyu,
Shen Aaron,
Velankar Sachin S.
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.49699
Subject(s) - materials science , glass transition , thermoplastic , composite material , polyether ether ketone , polymer , ether , amorphous solid , foaming agent , thermal stability , plasticizer , peek , dichloromethane , chemical engineering , solvent , porosity , organic chemistry , chemistry , engineering
Poly(phthalazinone ether ketone) (PPEK) is an amorphous thermoplastic polymer with a high glass transition temperature ( T g ) exceeding 250°C. We describe the preparation of foams from PPEK and characterize their properties. PPEK foams were prepared using dichloromethane as a foaming agent. The foaming agent was swollen into discs of the PPEK, which were then foamed by heating. Foams could be prepared at temperatures far below the T g of the PPEK due to plasticization of the polymer by the foaming agent. Foams with densities ranging from 0.1 to 0.65 g/cm 3 were prepared. Their thermal conductivity and modulus (measured approximately by indentation tests) were found to decrease with density, and the trends were similar to those expected from existing models. The foams could be annealed at 200°C without collapse suggesting that they may be useful in structural or insulation applications where stability at high temperature is essential.