摘要:
Described are crystalline block copolymers displaying high glass transition temperatures, excellent mechanical properties, excellent chemical and thermal stability, and good melt processability. These block polymers contain segments of crystalline poly(aryl ether ketones).
摘要:
Described herein are compositions suitable for photocopolymerization comprising a cyclic vinyl ether containing compound and an epoxide. These compositions can be cured to give coatings with improved flexibility and impact resistant properties.
摘要:
Described are crystalline block copolymers displaying high glass transition temperatures, excellent mechanical properties, excellent chemical and thermal stability, and good melt processability. These block polymers contain segments of crystalline poly(aryl ether ketones).
摘要:
Described herein are novel crystalline chain extended poly(aryl ether ketones) which display excellent toughness, fabricability and very good high temperature and solvent resistance.
摘要:
Described herein are compositions suitable for photocopolymerization comprising a cyclic vinyl ether containing compound and an epoxide. These compositions can be cured to give coatings with improved flexibility and impact resistant properties.
摘要:
Aryl and heteroaryl mono chlorides are coupled in an aprotic solvent under an inert atmosphere by a catalyst mixture of a nickel compound and a ligand in the presence of a reducing metal.
摘要:
Oligomers of hydroxy terminated polysulfones are extended to high molecular weight polysulfones by carbonate, ester, ether or silyl ether linkages.
摘要:
The invention describes a novel process for the preparation of polycarbonate and/or polyarylate block copolymers with poly(aryl ethers). The process is comprised of the steps:(a) the reaction of a dihydroxy-terminated poly(aryl ether) oligomer with a high molecular weight polycarbonate, or a high molecular weight polyarylate, or a high molecular weight poly(arylate-carbonate) to yield a block copolymer; followed by(b) the coupling of the material obtained in step (a) to the required molecular weight, using a diaryl ester of carbonic acid or of a dicarboxylic acid.Both steps are performed in the presence of a catalyst. The copolymerizations can be run in bulk under vacuum in a single or twin screw extruder. Using the above conditions high molecular weight, high quality block copolymers having a combination of excellent properties are obtained in a matter of minutes.
摘要:
The invention describes a novel process for the preparation of polycarbonate and/or polyarylate block copolymers with poly(aryl ethers). The process is comprised of the steps:(a) the reaction of a dihydroxy-terminated poly(aryl ether) oligomer with a high molecular weight polycarbonate, or a high molecular weight polyarylate, or a high molecular weight poly(arylate-carbonate) to yield a block copolymer; followed by(b) the coupling of the material obtained in step (a) to the required molecular weight, using a diaryl ester of carbonic acid or of a dicarboxylic acid.Both steps are performed in the presence of a catalyst. The copolymerizations can be run in bulk under vacuum in a single or twin screw extruder. Using the above conditions high molecular weight, high quality block copolymers having a combination of excellent properties are obtained in a matter of minutes.
摘要:
Described herein are novel poly(aryl ether) polymers that contain naphthalene, terephenylene and/or anthracenylene units within their chains. Representative polymers are tough materials having excellent high temperature, oxidative and chemical resistance, and easy melt fabricability.