Monsanto Company

Duke University

Dainippon Ink and Chemicals, Incorporated

Research Triangle Institute

Jack Preston

Satoshi Idemura

William L Hofferbert, Jr

William R Krigbaum

Alberto Ciferri

Polymer blend materials composed of an aromatic polyamide and flexible polyamide wherein the aromatic polyamide molecules are uniformly dispersed in a matrix of the flexible polyamide which are produced by first blending the flexible polyamide and monomer(s) for the aromatic polyamide in a solvent, then next polymerizing the monomer(s) in the presence of a phosphite compound, resulting in a transparent gel product capable of being fabricated into useful shaped articles without causing marked phase separation observed in polymer blend materials obtained by conventional coagulation method. The in situ formed aromatic polyamide is uniformly dispersed in the flexible polyamide matrix even in fabricated forms, giving improved transparency over the starting flexible polyamide and improved resistance toward chemicals such as acids, especially after heat treatment.

Polymer blend materials composed of an aromatic polyamide and a soluble

A polymeric material which is capable of forming high modulus, biaxially orientable structures of a cholesteric mesophase, wherein said polymeric material comprises an optically active monomer which is condensation co-polymerized with at least one p-phenylene containing monomer which is itself capable of forming a polymer exhibiting a nematic mesophase, or which is capable of being copolymerized with a second monomer to form a nematic mesophase, or which is capable of being copolymerized with racemic mixture of said optically active monomers to form a nematic mesophase, wherein the resulting copolymer is characterized by a degree of inflexibility sufficient to form a mesophase and wherein said optically active monomer is present in said polymer after copolymerization in an amount sufficient to impart optical activity to said polymer sufficient to form a cholesteric mesophase.

High modulus cholesteric mesophase polymers

A process for improving tensile properties of aramid fibers and structurally related fibers is described. The process involves soaking the fibers in a liquid tertiary amine maintained at a temperature of at least 80.degree. C.

Solution annealing of aramid and structurally related fibers

High molecular weight, thermally resistant heterocyclic polymers containing two or more different heterocyclic linkages occurring in an ordered sequence with aromatic linkages are prepared and solutions thereof used to spin fibers.

Growing community of inventors

Raleigh, NC, United States of America

Jack Preston