Title: Polyimide Nanocomposites with Remarkable Rubbery Plateau Modulus and Outstanding Coating Resistance

Authors: Jude O. Iroh and Jimmy Longun

DOI: 10.33599/nasampe/c.19.0787

Abstract: A multifunctional high temperature resistant polyimide-nanocomposites and thin films comprised of polyimide matrix filled with either polyaniline copolymer modified clay, 30B nanoclay or silicone, with excellent thermal-mechanical and coating resistance has been fabricated. The dynamic mechanical properties of the polyimide composite coatings and thin films which are correlative to the impact resistance, damping ability and high temperature stability of the composite coatings and thin films were studied using dynamic mechanical spectrometer (DMS). By using a unique technique to disperse nanofillers into the polyimide matrix, an extraordinary modulus enhancement of about 1500X was obtained for 30B clay/polyimide composites films in the rubbery plateau region at a clay volume fraction of 6.8%. Avery high modulus enhancement of about 48X was obtained in the rubbery plateau region for polyimide molecular composite coatings containing 2% of rubbery silicone filler. The glass-rubber transition temperature, which is the temperature at which a polymer changes from the glassy state to the rubbery state, was increased by about 70 ˚C in the nanocomposites thereby making the composite coatings and thin films suitable for high temperature applications in the aerospace industry.

Our results show that there is a considerable shift in tan δ peak location (damping peak), which is associated with the glass-rubber transition. At a high loading of polyaniline copolymer (SPNEAC), the glass transition temperature of the nanocomposites decreased with increasing SPNEAC content, however at low weight fraction of the copolymer of about 0.25wt%, a slight increase in the Tg to 406.3 ˚C was obtained.

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Conference: CAMX 2019

Publication Date: 2019/09/23

SKU: TP19-0787

Pages: 10

Price: $20.00