摘要:
In accordance with the present invention there are provided hyperbranched benzobisazole polymers having repeating units of the formulas: and hyperbranched bibenzazole polymers having repeating units of the formulas: wherein Q is —S— or —NH—; the terminal groups X and Y are COOH and respectively, with their total number (X+Y) equals n+1, where n=degree of polymerization. The ratio X:Y can be controlled by varying the stoichiometric ratio of trimesic acid (A3 monomer) and 2,5-diamino-1,4-dimercaptobenzene dihydrochloride (B2 monomer) from 1:1 to 1.1.35.
摘要:
Novel ether-ketone-imide hyperbranched polymers with thermally reactive ethynyl endgroups were prepared from the corresponding AB2 monomer and the respective benzophenone-based endcapping agents in one-pot fashion. The resulting polymer has repeating units of the formula: where the chain-end groups, Ar is a benzophenone with an ortho, a meta- or a para-ethynyl substituent.
摘要:
A poly(ether-ketone) composite of the formula: wherein DND is detonation nanodiamond particle; wherein Ar represents ether-ketone repeating groups of the formula wherein Q is —O— or —O—(CH2)n—O—, wherein n has a value of 2-12; wherein R is —H, —CH3, or —C2H5, m has a value of 1 or 2; wherein R′ is —H or —CH3; and wherein — denotes the presence of a direct C—C bond between Ar and DND. Also provided is a process for preparing the nanocomposites.
摘要:
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.
摘要:
Functionalized detonation nanodiamond particulates of the formula: wherein Ar is selected from the group consisting of: wherein R is selected from the group consisting of H, H3C—(CH2)n— and wherein n has a value of 0-10. Also provided is a process for functionalizing detonation nanodiamonds particulates.
摘要:
A composition is provided in which carbon nanofibers are functionalized with at least one moiety where the moiety or moieties comprise at least one bivalent radical. The composition can include a nanocomposite, such as polyimide films. Methods for making functionalized carbon nanofibers and nanocomposites are also provided.
摘要:
Novel ether-ketone-imide hyperbranched polymers with non-reactive benzophenone or thermally reactive phenylethynyl endgroups were prepared from the corresponding AB2 monomer and benzophenone-based endcapping agent in one-pot fashion. The resulting polymer has repeating units of the formula: where the chain-end groups, Ar's, are 4-benzophenone or 4-benzophenone with ortho, meta- or para-phenylethynyl substituents in the 4′-position.
摘要:
Provided are hyperbranched poly(ether-ketone)-based nanocomposites with the following generic formula: wherein n is the degree of polymerization and R is carboxylic acid (COOH) and various functional groups that could be derived from COOH, such as benzothiazole, benzoxazole, benzimidazole, esters, and amines. Also provided are a process for preparing the above composite and a chain-end conversion methodology to tailor thermal and solubility properties.
摘要:
A composition is provided in which carbon nanofibers are functionalized with at least one moiety where the moiety or moieties comprise at least one bivalent radical. The composition can include a nanocomposite, such as polyimide films. Methods for making functionalized carbon nanofibers and nanocomposites are also provided.