摘要:
The present invention generally relates to a reactive functional group-modified molecularly self-assembling material; method of making the reactive functional group-modified molecularly self-assembling material; manufactured article comprising the reactive functional group-modified molecularly self-assembling material; and a method of shaping the reactive functional group-modified molecularly self-assembling material.
摘要:
The invention relates to functionalized interpolymers derived from base olefin interpolymers, which are prepared by polymerizing one or more monomers or mixtures of monomers, such as ethylene and one or more comonomers, to form an interpolymer products having unique physical properties. The functionalized olefin interpolymers contain two or more differing regions or segments (blocks), resulting in unique processing and physical properties.
摘要:
The invention, in one aspect, is a copolymer comprising amorphous polyamide hard segments, which contain 1-methyl-2,4-phenylene, 1-methyl-2,6-phenylene, or mixtures thereof structure units. The structure characteristics of 1-methyl-2,4-phenylene, 1-methyl-2,6-phenylene, or mixtures thereof render the hard segments having glass transition temperatures below 200° C. while maintaining physical properties required for making molded articles.
摘要:
A remote inspection device for the inspection of the tubesheet in-bundle region of a steam generator. The device includes a rail system that is easily and quickly mounted to the end of tube at an in-bundle region of a steam generator, a carriage movable on the rail system for feeding at flexible, tape-like wand into the tube, and a probe mounted on an end of the flexible, tape-like wand for performing the inspection operation. The flexible, tape-like wand, which is composed of a flexible metal alloy, has a non-circular center section forming a channel for receiving cabling for the probe and opposed flat, wings on either side of the non-circular center section. Each wing has a row of feed holes positioned remote from the center section that provide engagement with a feed wheel of the carriage.
摘要:
Polyimide precursor solutions comprise an organic liquid and the reaction product of an aromatic dianhydride and an aromatic diaminobenzoxazole capped, on at least one terminal end, with a bifunctional chain extender. The bifunctional chain extender has one functional group reactive with the amine of the aromatic diaminobenzoxazole or the anhydride of the aromatic dianhydride and another functional group which does not form amic acid linkages, but which is capable of further reaction to increase the molecular weight of the polyimide precursor under conditions other than those used to react the aromatic diamine and aromatic dianhydride to form the polyimide precursor. These polyimide precursors can be converted into polyimidebenzoxazole polymers.
摘要:
Novel aryl ethers, containing both a carboxylic acid and a sulfonic acid functionality; and a process for making them are described. These difunctional aryl compounds comprise:i) a carboxylic acid group or its derivative,ii) a first aromatic group bonded to the carboxylic acid or its derivative,iii) a second aromatic group linked to the first aromatic group by a non-electron-withdrawing moiety,iv) a third aromatic group linked to the second aromatic group by a non-electron-withdrawing moiety, andv) a sulfonyl group or its derivative bonded to the third aromatic group.
摘要:
Block copolymers can be formed from heterocyclic polymers such as PBO and thermoplastic polymers such as polyamide or poly(aromatic ether ketone). The block copolymer compositions are thermoplastic and do not experiSTATEMENT OF GOVERNMENT INTERESTThis invention was made with Government support under contract F33615-86-C-5068 awarded by the Department of the Air Force. The Government has certain rights in this invention.
摘要:
Block copolymers can be formed from heterocyclic polymers such as PBO and thermopSTATEMENT OF GOVERNMENT INTERESTThis invention was made with Government support under contracts F49620-86-C-0057 and/or F33615-86-C-5068 awarded by the Department of the Air Force. The Government has certain rights in this invention.
摘要:
An air conditioning control system for at least two duct sections each with an associated damper comprises at least one master controller for a first pneumatic actuator for one damper and at least one tracking controller for a second pneumatic actuator for the other damper. The master controller comprises a first flow sensor producing a first flow variable signal in response to a sensed flow in the duct section associated with the said one damper. An adjustable reference or bias signal means is provided and a temperature signal is combined therewith to provide a composite signal for comparison with the flow variable signal. A resultant signal after comparison operates the first pneuamtic actuator for the said one damper. A tracking controller comprises a second flow sensor producing a second flow variable signal in response to sensed flow in the duct section associated with the other damper. A second signal comparison and transmitting means receives the first and second flow variable signals, compares the two and transmits a second resultant signal to the second pneumatic actuator for control of the said other damper. The second comparison means includes a pivotally mounted lever acted upon by diaphragm actuated first and second push rods representing the first and second flow variable signals. One of the diaphragm assemblies is mounted for slidable adjustment along the lever to vary the relative mechanical advantage and to vary the flow ratio between the two dampers and duct sections.