Abstract: Rigid-rod polymer fiber filaments, such as poly (p-phenylenebenzobisoxazole) (PBO), having improved retention of physical properties are prepared by preparing a polymer solution and extruding that solution to form a filament, and then treating that filament with water, base solution, and water. The treated filament may be further heat-treated, or further treated with water. The treated filaments are less susceptible to the degradation caused by heat, humidity, and UV radiation.

Abstract: A sulfonated polyarylenethioethersulfone polymer and copolymer. The sulfonated polyarylenethioethersulfone polymer and copolymer comprises the reaction product of an aromatic dihalo functionality sulfonated monomer, an aromatic dithiol monomer, and optionally an aromatic dihalo functionality monomer. The invention also relates to methods of making the sulfonated polyarylenethioethersulfone polymer and copolymer, and to membranes made from the sulfonated polyarylenethioethersulfone polymer and copolymer.

Abstract: Polyaryleneetherketone triphenylphosphine oxide compositions incorporating cycloaliphatic units are provided which may be used as a polymeric binders in thermal control coatings for use in space environments. A method is also provided for synthesizing the polyaryleneetherketone triphenylphosphine oxide compositions. A method is also provided for synthesizing the monomeric compositions used to make the polyaryleneetherketone triphenylphosphine oxide compositions.