Bis(trialkylsiloxyphenyl)-arylfluoride imide AB2 monomers, hyperbranched polymers and nanoclay composites therefrom
AssigneeThe United States of America as represented by the Secretary of the Air Force
InventorsLoon-Seng Tan, David H. Wang
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Abstract
Novel aromatic AB2 imide monomer with thermally reactive trialkylsiloxy and aryl fluoride moieties, which can be polymerized to form hyperbranched aromatic polyimides in the presence of a metal fluoride catalyst. Nanoclay composites were generated by either (i) direct blending of a preformed hyperbranched aromatic polyimide and Closite nanoclay (≦20 wt %) or (ii) blending of the AB2 monomer, CsF catalyst and Closite nanoclay (≦20 wt %) followed by thermal solid-state polymerization of the AB2 monomer homogeneously dispersed in the nanoclay.
Claims6
A nanocomposite derived from direct blending of a hyperbranched polymer with the following formula:
- where R1, R2 and R3 are substituents which may or may not be the same:
- wherein R1=R2=R3=methyl;
- or R1=R2=methyl and R3=is ethyl, n-propyl, iso-propyl, n-butyl, iso-butyl, sec-butyl, t-butyl, or neopentyl, and wherein n is the degree of polymerization;
- with a nanoclay in a suitable solvent.
Dependencies are inferred from the claim text.