摘要:
A poly(ether-ketone) composite of the formula: wherein CNF is carbon nanofibers and MWNT is multi-walled carbon nanotubes; 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 — denoted the presence of a direct C—C bond between Ar and CNF or MWNTg Also provided is a process for preparing the composite.
摘要:
A quinoxaline-containing hyperbranched ether-ketone polymer having repeating units of the formula: and a method for preparing the polymer are provided.
摘要:
Amine-terminated hyperbranched quinoxaline-amide polymers having repeating units of the formula: are useful to initiate bismaleimide polymerization and to increase the toughness of thermosets such as BMI and epoxies.
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:
Hyperbranched benzazole polymers having repeating units of the formula: wherein Q is —O—, —S— or —NH—, and the terminal groups R are carboxylic acids with their total number equals n+1. A generic method for preparing the polymers is provided. Also provided are the star block copolymers derived from these hyperbranched benzazole polymers and linear poly(ether-ketones) having the following generic formula where x and y are the numbers of repeat units for each poly(ether-ketone) chain; the placement of the carbonyl moieties in the repeat units of the poly(ether-ketone) chains can be either meta or para to the phenoxy groups; the maximal number of poly(ether-ketone) chains is n+1, where n=number of repeat units for hyperbranched polybenzazole). A general method for synthesizing these star block copolymers is provided.
摘要:
Functionalized nanoscale carbon fibers and tubes 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 nanoscale carbon fibers or tubes.
摘要:
New hyperbranched polymers having repeating units of the formula The polymer is prepared by the polymerization of the AB2 monomer N-{3,5-bis(4-hydroxybenzoyl)benzene}-4-fluoroisophthalimide.
摘要:
An end-capped quinoxaline-containing hyperbranched ether-ketone polymer having repeating units of the formula: wherein n represents the degree of polymerization for the parent hyperbranched polymer, x represents the degree of endgroup functionalization, x has a value of 0.05 to 1.0, and G is selected from the group consisting of and alkyl having 2 to 16 carbon atoms, and a method for preparing the polymer are provided.