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

University of Dayton

Other

United States of America, As Represented by the Secretary of the Navy

Loon-Seng Tan

David Huabin Wang

Ramamurthi Kannan

Jong-Beom Baek

Zhenning Yu

Fred E Arnold, Jr

Matthew Dalton

Richard A Vaia

Timothy J White

Hilmar Koerner

Balasubramanian Sankaran

Kasturi Rangan Srinivasan

Jeong Jae Wie

Kyung Min Lee

Devdatt S Nagvekar

Thuy D Dang

Bruce A Reinhardt

Narayanan Venkatasubramanian

Lei Zhu

Long Y Chiang

Jim C Spain

Kyoungweon Park

Lloyd J Nadeau

Philip R Buskohl

Patrick T Mather

Ruel McKenzie

Tara M Storage

John B Ferguson

Hong G Jeon

Jerald L Burkett

Narayanan Venkatasubramaian

Bingqian Zheng

A family of low-molecular-weight, main-chain thermotropic liquid-crystalline polyimides (TLC-PI) that are crosslinkable is disclosed. These all-aromatic TLC-PI are derived from (i) wholly aromatic and flexible diamine monomers, in which the linkage between the two aniline-ends contains a relatively high heat-tolerant but flexible chain constituted by two or more units of 1,4-phenoxy or 1,3-phenoxy or in combinations of both. Processes of making and using such all-aromatic TLC-PI is also provided.

All-aromatic liquid-crystalline homo-polyimides with aromatic endgroups and crosslinked products therefrom

The invention relates to cross-linkable thermoplastics, processes of making such cross-linkable thermoplastics and products comprising such cross-linkable thermoplastics. Such cross-linkable thermoplastics provide articles made by the additive manufacturing (AM) process with increased strength, the desired in use temperature stability and the desired thermo-oxidative stability.

Cross-linkable thermoplastics, and processes of making and using same

Applicants disclose a family of rod-like dianhydrides that contain two phthalic anhydride moieties linked by a bridge that is comprised of at least one ethynyl and one paraphenylene group and processes of making and using such rod-like dianhydrides. Such rod-like dianhydrides can endow net-work structures with improved mechanical and thermal properties in the crosslinked-polymer products.

Crosslinkable mesogenic dianhydride monomers

The invention relates to cross-linkable oligoimides, processes of making such cross-linkable oligoimides and products comprising such cross-linkable oligoimides. Such cross-linkable oligoimides provide articles made by an AM process with the desired process ability that permits filament formation, post cure increased strength, the desired in use temperature stability and the desired thermo-oxidative stability.

Cross-linkable oligoimides, and processes of making and using same

The invention generally relates to polymer nanocomposite films that possess shape memory properties at elevated temperatures. Such films can absorb microwaves, are thermally conductive, are electrically conductive and have increased mechanical strength. In addition, the present invention relates to methods of fabricating such films into 3D objects. Due to the improved properties of such films more advanced sensors and microwave shields can be constructed.

Shape-memory polyimide nanocomposites and fabrication of same

The invention relates to bis(aniline) compounds containing multiple arylethynyl, alkylethynyl, ethynyl groups or their combinations, processes of making such compounds and materials comprising such compounds. Such, bis(aniline) compounds preferably comprise multiple phenylethynyl (PE) groups, i.e. 2-4 PE moieties. Such compounds are useful monomers for the preparation of polyimides, polyamides and poly(amide-imides) whose post-fabrication crosslinking chemistry (i.e. reaction temperature) can be controlled by the number of PE per repeat unit as well as finding utility in thermosetting matrix resins, 3D printable resins, and as high-carbon-content precursors to carbon-carbon composites.

Bis(aniline) compounds containing multiple substituents with carbon-carbon triple-bonded groups

The invention generally relates to shape memory films that are tri-functionally crosslinked and that comprise multiple, non-terminal, phenylethynyl moieties. In addition, the present invention relates methods of fabricating such films. Due to the improved properties of such SMPS, the SMP designer can program in to the SMP mechanical property enhancements that make the SMP suitable, among other things, for advanced sensors, high temperature actuators, responder matrix materials and heat responsive packaging.

Lightly crosslinked polyimides with phenylethynyl pendants for shape-memory effect and programmed enhancement in Tg and modulus

A family of low-molecular-weight, main-chain thermotropic liquid-crystalline co-polyimides (TLC-CoPI) that are crosslinkable, and based on a unique, liquid-crystallinity (LC)-enabling diamine, namely, 1,3-bis[4-(4′-aminophenoxy)cumyl]benzene (BACB) and two or more mesogenic dianhydrides, at least one of which is a diphthalic dianhydride (DPA) that contains one or more thermally reactive and crosslinkable moieties similar to that of phenylethynyl (PE) is disclosed. Processes of making and using such low-molecular-weight, main-chain thermotropic liquid-crystalline co-polyimides are also provided.

Highly aromatic and liquid-crystalline co- polyimides endcapped with aromatic groups and crosslinked products therefrom

The invention generally relates to shape memory films that are tri-functionally crosslinked and that comprise multiple, non-terminal, phenylethynyl moieties. In addition, the present invention relates methods of fabricating such films. Due to the improved properties of such SMPs, the SMP designer can program in to the SMP thermomechanical property enhancements that make the SMP suitable, among other things, for advanced sensors, high temperature actuators, responder matrix materials and heat responsive packaging.

Multiphenylethynyl-containing and lightly crosslinked polyimides capable of memorizing shapes and augmenting thermomechanical stability

The invention relates to nanohybrids that are gold nanorod J-aggregates having a broadened surface plasmonic resonance band, processes of making such gold nanorod J-aggregates and products comprising such gold nanorod J-aggregates. Such gold nanorod J-aggregates exhibit broad localized surface plasmonic reasonable range from 800 nm to 2000 nm.

Polyimide-gold-nanorod J-aggregates with broadened surface plasmonic resonance band and method of manufacture

Method for fabricating multiphenylethynyl-containing and lightly crosslinked polyimides capable of memorizing shapes and augmenting thermomechanical stability

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Centerville, OH, United States of America

Loon-Seng Tan