Abstract: A Ti--Al--V--Cr intermetallic alloy having an atomic percent composition of 5-35 Al, 10-15 (V+Cr), the balance being Ti. The alloy is partially of DO.sub.19 type and partially of B2 type and has high temperature strength and excellent room temperature ductility. The alloy is produced by arc melting the metallic components Ti, Al and at least one of V and Cr; followed by homogenizing the melted components; solidifying the melted components to form an alloy; hot working the solidified alloy by isothermal forming to form a beta-phase polycrystalline microstructure; transforming the metastable .beta.-phase into a two-phase microstructure; and equilibrating the two-phase microstructure by prolonged annealing.

Abstract: Fluorinated styrenes of the formula I: ##STR1## where R.sub.1 is a C.sub.1 -C.sub.6 alkyl and R.sub.2 is the repeating unit ##STR2## where x is zero or any positive integer, which are useful as compatibilizing and toughening agents for various polymers such as styrene, dienes (butadiene, isoprene, etc.) acrylates, polymethacrylates, polycarbonates, polyesters, polyamides, etc. Particularly preferred are p-(1,1,1,3,3,3-hexafluoro-2-hydroxy isopropyl)-.alpha.-methylstyrene, polymers thereof, block and random copolymers thereof and polymer blends incorporating the same.

Abstract: Fluorinated styrenes of the formula I: ##STR1## where R.sub.1 is a C.sub.1 -C.sub.6 alkyl and R.sub.2 is the repeating unit ##STR2## where x is zero or any positive integer, which are useful as compatibilizing and toughening agents for various polymers such as styrene, dienes (butadiene, isoprene, etc.) acrylates, polymethacrylates, polycarbonates, polyesters, polyamides, etc. Particularly preferred are p-(1,1,1,3,3,3-hexafluoro-2-hydroxy isopropyl)-.alpha.-methylstyrene, polymers thereof, block and random copolymers thereof and polymer blends incorporating the same.

Abstract: The processes of the invention enable depositable PFSA to be provided over he entire inner surface of hollow fibers. Additionally, the processes of this invention provide a fiber which is coated by a thin coating of PFSA which is approximately 5-40 .mu.m thick. The fiber can advantageously withstand pressure gradients between 20-75 psig throughout its wall before leakage.

Abstract: A method for thermal environment sensing utilizing superconducting materi finds utility in the production of low power cryogenic flow meters, bolometers, level detectors and other types of thermal environment sensors. A device for determining the first and second derivatives (dV/dI and d.sup.2 V/dI.sup.2) utilizes a ramped current until a set value of the first derivative (dV/dI) is achieved, the current supply being placed in a feedback mode to maintain the first derivative constant and monitoring any changes in the second derivative (d.sup.2 V/dI.sup.2) which indicate changes in the thermal environment. Alternatively, the second derivative is maintained constant and the first derivative is measured. Any parameter which is indicative of the non-linearity of the relationship between the voltage and the current can be utilized instead of the second derivative.

Abstract: Fluorinated styrenes of the formula I; ##STR1## where R.sub.1 is a C.sub.1 -C.sub.6 alkyl and R.sub.2 is the repeating unit ##STR2## where x is zero or any positive integer, which are useful as compatibilizing and toughening agents for various polymers such as styrene, dienes (butadiene, isoprene, etc.) acrylates, polymethacrylates, polycarbonates, polyesters, polyamides, etc. Particularly preferred are p-(1,1,1,3,3,3-hexafluoro-2-hydroxy isopropyl)-.alpha.-methylstyrene, polymers thereof, block and random copolymers thereof and polymer blends incorporating the same.

Abstract: The present disclosure is directed to composite membranes formed by casting thin (about 8 to about 20 microns) film of perfluorosulfonic acid (PFSA) polymer on a porous matrix of polytetrafluoroethylene (PTFE). The ion exchange groups in these membranes are protons and can be substituted with metal ions such as Na.sup.+, Ca.sup.+, Ag.sup.+, etc. or by organic ligands. Alternatively, even thinner membranes (from about 1 micrometer or thinner up to 20 micrometers) can be formed by spraying a PPSA polymer solution on a porous matrix. The porous matrix may comprise polytetrafluoroethylene alone or in combination with a thermobonded polypropylene support.Both the acid and the substituted membranes have remarkable affinity for polar compounds or mixtures of polar and non-polar compounds such that azeotropic mixtures of organic compounds as well as close-boiling liquid mixtures can be easily separated at good permeation rates using the technique of pervaporation.

Abstract: The present invention is a fibrous monolithic ceramic product of high deny and a process for making the product. The product has a microstructure of coated fibers with planes of weakness between a core of each coated fiber and its respective coat or between each coated fiber and adjacent coated fibers, thereby toughening the product. The planes of weakness are sufficiently weak to deflect a crack from normal to the plane of weakness to a direction parallel to the plane of weakness. The green body from which the product is formed, can be plastically deformed at room temperature, formed in near-net-shape, and densified by pressureless sintering.