摘要:
Sulfonated block copolymer suitable for use as proton exchange membranes for fuel cells comprise sulfonated polyaryletherketone blocks and polyethersulfone blocks. The sulfonated polyaryletherketone blocks comprise structural units of formula (I) wherein R 1 is C 1 -C 10 alkyl, C 3 -C 12 cycloalkyl, C 6 -C 14 aryl, allyl, alkenyl, alkoxy, halo, or cyano; Ar 1 and Ar 2 are each independently C 6 -C 2O aromatic radicals, or Ar 1 and Ar 2 , taken together with an intervening carbon atom, form a bicyclic C 6 -C 20 aromatic radical or a tricyclic C 6 -C 20 aromatic radical; M is H, a metal cation, a non-metallic inorganic cation, an organic cation or a mixture thereof; and a is 0 or an integer from 1 to 4.
摘要:
A polyethersulfone composition is disclosed which comprises structural units derived from bisphenol-A and 4,4'-biphenol, the structural units derived from 4,4'-biphenol being present in an amount corresponding to greater than 65 mole percent based on total moles of structural units derived from diphenolic monomers, wherein the polyethersulfone has a weight average molecular weight (M w ) of at least 54,000 grams per mole as measured by gel permeation chromatography. The polyethersulfone compositions of the invention display outstanding impact strength as measured using ASTM D256. Surprisingly, the polyethersulfone compositions of the invention show enhanced impact strength relative to known polyethersulfones such as RADEL R, a commercially available polyethersulfone engineering thermoplastic comprised of structural units derived from a dihalodiarylsulfone and 4,4'-biphenol and having a Notched Izod impact strength of about 700 Joules per meter.
摘要:
Sulfonated block copolymer suitable for use as proton exchange membranes for fuel cells comprise sulfonated polyaryletherketone blocks and polyethersulfone blocks. The sulfonated polyaryletherketone blocks comprise structural units of formula (I) and the polyethersulfone blocks comprising structural units of formula (II) wherein R 1 , R 2 , R 3 and R 4 are independently C 1 -C 10 alkyl, C 3 -C 12 cycloalkyl, C 6 -C 14 aryl, allyl, alkenyl, alkoxy, halo, or cyano; Z and Z 1 are independently a direct bond or O, S, (CH 2 ) r , (CF 2 ) r , C(CH 3 ) 2 , C(CF 3 ) 2 , or a combination thereof; M is H, a metal cation, a non-metallic inorganic cation, an organic cation or a mixture thereof a is 0 or an integer from. 1 to 3; b, c and d are independently 0 or an integer from 1 to 4; m and n are independently 0 or 1 ; and r is an integer from 1 to 5.
摘要:
Polyether polymers, such as polyetherimides, are prepared by the reaction of a dihydroxy-substituted aromatic hydrocarbon alkali metal salt, such as bisphenol A disodium salt, with a bis(N-(chlorophthalimido))aromatic compound, such as 1,3-and/or 1,4-bis[N-(4-chlorophthalimido)]benzene, in a solvent such as o-dichlorobenzene and in the presence of a phase transfer catalyst such as a hexaalkylguanidinium chloride. Several embodiments may be employed to improve the method. They comprise employing substantially dry reagents, employing a high solids level in solvent, beginning with an excess of bis(N-(chlorophthalimido))-aromatic compound and incrementally adding alkali metal salt, employing alkali metal salt of small particle size, and using reagents of high purity.
摘要:
Oxydiphthalic anhydrides such as 4-oxydiphthalic anhydride are prepared by the reaction of a halophthalic anhydride with an alkali metal carbonate such as potassium carbonate. The reaction proceeds in the presence of a hexaalkylguanidinium halide or α,ω-bis(pentaalkylguanidinium)alkane halide as a phase transfer catalyst.
摘要:
Polyethersulfones having Tg greater than about 225°C and a notched Izod value greater than about 1 ft-lb/in, as measured by ASTM D256, comprise from about 5 mol% to less than about 40 mol% structural units of formula 1; and from greater than about 60 mol% to about 95 mol% structural units of formula 2 wherein R 1 , R 2 , and R 3 are independently at each occurrence a halogen atom, a nitro group, a cyano group, a C 1 -C 12 aliphatic radical, C 3 -C 12 cycloaliphatic radical, or a C 3 -C 12 aromatic radical; n, m, q are independently at each occurrence integers from 0 to 4; and Q is a C 3 -C 20 cycloaliphatic radical, or a C 3 -C 20 aromatic radical.
摘要:
Disclosed is a method for preparing an alkali metal salt of a hydroxy-substituted hydrocarbon which comprises the steps of (i) contacting in solvent media at least one hydroxy-substituted hydrocarbon with a base comprising an alkali metal cation; and (ii) devolatilizing the solvent media comprising alkali metal salt by adding or spraying the solvent media into a substantially water-immiscible organic solvent, said solvent being at a temperature greater than the boiling point of solvent media at the prevailing pressure. In one embodiment the solvent media comprises water, and optionally at least one water-soluble protic organic solvent.
摘要:
A method of preparing block copolymers by solid state polymerization is described. A mixture of a partially crystalline polycarbonate having activated terminal aryloxy groups, for example terminal methyl salicyl groups, when heated together with an oligomeric polyester having reactive terminal hydroxy groups under solid state polymerization conditions affords block copolymers. The activated terminal aryloxy groups play a key role in preserving the block lengths of the starting materials. A control sample in which the partially crystalline polycarbonate lacks activated terminal aryloxy groups, for example polycarbonates substituted by phenol, affords a much lower molecular weight, more highly randomized copolymer product. The product block copolymers are useful as "weatherable" plastic materials.
摘要:
A process for the production of polycarbonate be melt-polycondensing an aromatic dihydroxy compound and diphenylcarbonate, the process comprising adding to the polycarbonate under melt conditions a compound of the formula (I) wherein R 1 and R 3 may be the same or different and are selected from the group consisting of alkoxy, phenoxy, benzoxy, aryloxy, phenyl and aryl groups, R 2 is selected from the group consisting of alkyl, phenyl, aryl, or aralkyl groups.
摘要:
Sulfonated block copolymers that may be used as membranes for fuel cells include sulfonated polyaryletherketone blocks and lightly sulfonated polyethersulfone blocks. The sulfonated polyaryletherketone blocks include structural units of formula (I) and the lightly sulfonated polyethersulfone blocks include structural units of formula (II) and (III) wherein R 1 , R 2 , R 3 , R 4 , R 5 and R 6 are independently C 1 -C 10 alkyl, C 3 -C 12 cycloalkyl, C 6 -C 14 aryl, allyl, alkenyl, alkoxy, halo, or cyano; Z, Z 1 and Z 2 are independently a direct bond or O, S, (CH 2 )r, (CF 2 )r , C(CH 3 ) 2 , C(CF 3 ) 2 , or a combination thereof; M is H, a metal cation, a non-metallic inorganic cation, an organic cation or a mixture thereof; a and e are independently 0 or an integer from 1 to 3 ; b, c, d, and f are independently 0 or an integer from 1 to 4; m, n and p are independently 0 or 1 ; and r is an integer from 1 to 5.