United States of America as Represented by the Secretary of the Air Force

Other

Bruce A Reinhardt

Fred E Arnold, Jr

Marilyn R Unroe

Ramamurthi Kannan

Loon-Seng Tan

Lawrence L Brott

Stephen J Clarson

Nandini Mukherjee

Anadi Mukherjee

Jayprakash C Bhatt

Patricia M Lindley

Conrad S Sarvis

Richard A Vaia

Frederick L Hedberg

Two-photon responsive chromophores containing electron accepting core units

Multi-armed chromophores with very large two-photon absorption cross-sections

The purpose of the nonlinear spectrophotometer is to provide a simple instrument that can be used on a routine basis to accurately measure the two-photon absorption (TPA) coefficient and cross-section on a wide variety of materials. The instrument is capable of measuring: (1) both organic and inorganic materials, (2) solutions and thin film materials forms, and (3) materials which are fluorescent and nonfluorescent.

Nonlinear spectrophotometer

A two-photon absorbing chromophore of the formula

Symmetrical dyes with large two-photon absorption cross-sections

Asymmetrical dyes with large two-photon absorption cross-sections

The compound 2-ethynyl-5-(4-pyridyl)ethynyl thiophene: ##STR1## when incorporated into a thermoplastic polymer having repeating units of the formula: ##STR2## wherein X is --O-- or --S--, and R is selected from the group consisting of: ##STR3## and Ar is selected from the group consisting of: ##STR4## wherein X is as previously defined, poled to align the molecules and cured to crosslink at least the terminal acetylenic groups, has second-order nonlinear optical activity.

Acetylenic heterocyclic nonlinear optical thermoset monomers

There is provided an aromatic benzoxazole polymer having repeating units of the formula ##STR1## wherein Ar is ##STR2## wherein R is an alkyl group having 8 to 12 carbon atoms. The polymers of this invention are prepared by the polycondensation of 4,4'-hexafluoroisopropylidene bis(2-aminophenol) with a dicarboxylic acid selected from the group consisting of isophthalic acid, terephthalic acid, 2,5-pyridine dicarboxylic acid, 2,6-pyridine dicarboxylic acid and a 2,5-bis(alkoxy) terephthalic acid of the formula ##STR3## wherein R is an alkyl group having 8 to 12 carbon atoms, in a suitable reaction medium containing a suitable dehydrating agent.

Method of synthesis of thermoplastic aromatic benzoxazole polymers

Provided are dialkyloxy-substituted terephthalic acids of the formula ##STR1## wherein R is an alkyl group having about 8 to 12 carbon atoms. Also provided is a method for preparing these dialkyloxy-substituted terephthalic acids.

Decyloxy-substituted terephthalic acid compounds and method of synthesis

A bis(o-diamine) is reacted with a bis(benziloxy)-2,2'-bis(arylethynyl)biphenyl to provide a qunioxaline polymer having pendant phenylethynyl groups. These polymers can be cured to provide thermally stable polymer compositions.

High temperature solvent resistant amorphous thermoplastic phenylethynyl

Bis(benzilyloxy) compounds having the general formula ##STR1## wherein Ph is --C.sub.6 H.sub.5 and Ar is Ph, --C.sub.6 H.sub.4 Br, --C.sub.6 H.sub.4 CH.sub.3 or --C.sub.6 H.sub.4 C.sub.2 H.sub.5. These compounds can be reacted with bis(o-diamines) to form polyquinoxalines which can be converted to thermally stable compositions by non-volatile, intramolecular cyclization.

Bis(benzilyloxy) compounds

Phenylquinoxaline monomers of the formula Ar--C.tbd.C--Pq--C.tbd.C--Ar are disclosed, wherein Pq is ##STR1## wherein X is a single bond, --O--, --S--, --SO.sub.2 --, --CH.sub.2 --, --CO--, --OC.sub.6 H.sub.4 O--, --OC.sub.6 H.sub.4 --C.sub.6 H.sub.4 --O--, --OC.sub.10 H.sub.6 O-- or --OC.sub.6 H.sub.4 SO.sub.2 C.sub.6 H.sub.4 O--; and wherein Ar is an aromatic ether or thioether. These monomers can be crosslinked to provide thermoset resins of the formula ##STR2## wherein Pq and Ar are as defined above and n has a value between 2 and 3.

Phenylquinoxaline resin monomers

Phenylquinoxaline monomers containing sterically hindered ethynyl groups are provided. These monomers can be crosslinked to provide thermoset resins of the general formula ##STR1## wherein Pq is a phenylquinoxaline linking unit. Ar is an aromatic ether or thioether, and n has a value between 2 and 3.

Phenylquinoxaline resin compositions

Arylether compounds containing terminal phenylethynyl groups are provided. Also provided is a process for producing these compounds. The following compounds are claimed; 4,4'-bis(3-phenylethynyl-phenoxy) diphenylsulfone; 2,2-bis[([([3-phenoxy]-3-phenoxy)-3-phenylethynyl]-3-phenoxy)-4-phenyl]-pr opane and 2,2-bis[([([3-phenoxy]-3-phenoxy)-3-phenyl ethynyl]-3-phenoxy)-4-phenyl]-hexafluoropropane.

Thermosetting arylether compounds and their synthesis

Thermally stable resins based on arylether compounds having terminal phenylethynyl groups are provided.

Growing community of inventors

New Carlisle, OH, United States of America

Bruce A Reinhardt