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Novel permselective membrane compositions comprise a crosslinked polymer membrane. The polymer membrane has from about 25 to 100 parts by weight of a polyarylene having the formula ##STR## and from about 0 to 75 parts by weight of a crosslinkable copolymer, the copolymer being present at least when

Novel permselective membrane compositions comprise a crosslinked polymer membrane. The polymer membrane has from about 25 to 100 parts by weight of a polyarylene having the formula ##STR## and from about 0 to 75 parts by weight of a crosslinkable copolymer, the copolymer being present at least when the polyarylene component is devoid of crosslinkable cites. The foregoing polymer or polymer mixture is crosslinked by a silicon-containing amineterminated compound selected from the group consisting of the siloxanes having the formula ##STR## and silanes having the formula ##EQU##H 2 N--R 2 --[Si--O--R 4 ] 3 .

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1. A permselective membrane composition for the separation of gases from a mixture containing at least two gases comprising: from about 25 to 100 parts by weight of a polyarylene having the formula ##STR## wherein R is a C 1 to C 8 aliphatic radical, a C 5 to C 7 cycloaliphatic radical, a C 1 to

1. A permselective membrane composition for the separation of gases from a mixture containing at least two gases comprising: from about 25 to 100 parts by weight of a polyarylene having the formula ##STR## wherein R is a C 1 to C 8 aliphatic radical, a C 5 to C 7 cycloaliphatic radical, a C 1 to C 8 alkoxy radical, a C 6 to C 12 aryl radical, an aralkyl radical or an alkaryl radical, each radical being free of a tertiary alpha-carbon atom; X is H, Cl or Br; Y is a divalent oxygen or sulfur atom or a sulfonyl or carbonate group; Q is H, Cl, Br, or a sulfonyl radical of the formula ##STR## where R 1 is a C 1 to C 20 linear or branched hydrocarbon or a nonpolymeric aryl radical; and n is an integer of from about 75 to 10,000; from about 0 to 75 parts by weight of a crosslinkable copolymer, the copolymer being present at least when the polyarylene component is devoid of crosslinkable cites; and from about one to 50 parts by weight, based upon the total weight of said polyarylene and crosslinkable copolymer, of a silicon-containing amineterminated compound selected from the group consisting of the siloxanes having the formula ##STR## wherein R 2 is a C 1 to C 12 aliphatic radical or a C 1 to C 12 aliphatic radical containing a primary or secondary amine, R 3 is a C 1 to C 12 aliphatic radical or a C 6 to C 12 aryl radical, n is an integer of from about two to 2000 and x is 1 or 2, and silanes having the formula ##EQU##H 2 N--R 2 --[Si--O--R 4 ] 3 wherein R 4 is a C 1 to C 12 aliphatic radical. 2. A permselective membrane composition, as set forth in claim 1, wherein said polyarylene is present in an amount of 100 parts, said R is methyl, one X is bromine and the other X is hydrogen, Y is oxygen, Q is hydrogen and n is 100 to 3000. 3. A permselective membrane composition, as set forth in claim 2, wherein said silicon-containing amineterminated compound is aminopropyl terminated polydimethylsiloxane. 4. A permselective membrane composition, as set forth in claim 2, wherein said silicon-containing amine-terminated compound comprises aminopropyltriethoxysilane, silicon tetraethoxysilane and mixtures thereof. 5. A permselective membrane composition, as set forth in claim 1, comprising 100 total parts of said polyarylene and said crosslinkable copolymer wherein said R is methyl, said X is hyrdrogen, Y is oxygen, Q is hydrogen and n is 100 to 3000. 6. A permselective membrane composition, as set forth in claim 5, wherein said polyarylene is present in an amount of 75 parts and said crosslinkable copolymer is present in an amount of 25 parts, said copolymer comprising a random copolymer containing maleic anhydride. 7. A permselective membrane composition, as set forth in claim 6, wherein said copolymer comprises poly(styrene-co-maleic anhydride). 8. A permselective membrane composition, as set forth in claim 7, wherein said silicon-containing amine-terminated compound is aminopropyl terminated polydimethylsiloxane. 9. A permselective membrane composition, as set forth in claim 7, wherein said silicon-containing amine-terminated compound comprises aminopropyltriethoxysilane, silicon tetraethoxysilane and mixtures thereof. 10. A permselective membrane composition, as set forth in claim 1, comprising 100 total parts of said polyarylene and said crosslinkable copolymer wherein said R is methyl, said X is hydrogen, Y is oxygen, one Q is bromine and the other Q is hydrogen and n is 100 to 3000. 11. A permselective membrane composition, as set forth in claim 10, wherein said polyarylene is present in an amount of 75 parts and said crosslinkable copolymer is present in an amount of 25 parts, said copolymer comprising a random copolymer containing maleic anhydride. 12. A permselective membrane composition, as set forth in claim 11, wherein said copolymer comprises poly(styrene-co-maleic anhydride). 13. A permselective membrane composition, as set forth in claim 11, wherein said silicon-containing amineterminated compound is aminopropyl terminated polydimethylsiloxane. 14. A permselective membrane composition, as set forth in claim 11, wherein said silicon-containing amine-terminated compound comprises aminopropyltriethoxysilane, silicon tetraethoxysilane and mixtures thereof. 15. A process for the separation of gases from a mixture containing at least two gases comprising the step of: passing said mixture over a permselective membrane composition wherein said membrane composition is formed by a polymer membrane having from about 25 to 100 parts by weight of a polyarylene having the formula ##STR## wherein R is a C 1 to C 8 aliphatic radical, a C 5 to C 7 cycloaliphatic radical, a C 1 to C 8 alkoxy radical, a C 6 to C 12 aryl radical, an aralkyl radical or an alkaryl radical, each radical being free of a tertiary alpha-carbon atom; X is H, Cl or Br; Y is a divalent oxygen or sulfur atom or a sulfonyl or carbonate group; Q is H, Cl, Br, or a sulfonyl radical of the formula ##STR## where R 1 is a C 1 to C 20 linear or branched hydrocarbon or a nonpolymeric aryl radical; and n is an integer of from about 75 to 10,000; from about 0 to 75 parts by weight of a crosslinkable copolymer, the copolymer being present at least when the polyarylene component is devoid of crosslinkable cites; and from about one to 50 parts by weight, based upon the total weight of said polyarylene and crosslinkable copolymer, of a silicon-containing amineterminated compound selected from the group consisting of the siloxanes having the formula ##STR## wherein R 2 is a C 1 to C 12 aliphatic radical or a C 1 to C 12 aliphatic radical containing a primary or secondary amine, R 3 is a C 1 to C 12 aliphatic radical or a C 6 to C 12 aryl radical, n is an integer of from about two to 2000 and x is 1 or 2, and silanes having the formula ##EQU##H 2 N--R 2 --[Si--O--R 4 ] 3 wherein R 4 is a C 1 to C 12 aliphatic radical. 16. A process, as set forth in claim 15, comprising 100 parts of said polyarylene wherein said R is methyl, one X is bromine and the other X is hydrogen, Y is oxygen, Q is hydrogen and n is 100 to 3000. 17. A process, as set forth in claim 16, wherein said silicon-containing amineterminated compound is aminopropyl terminated polydimethylsiloxane. 18. A process, as set forth in claim 16, wherein said silicon-containing amineterminated compound comprises aminopropyltriethoxysilane, silicon tetraethoxysilane and mixtures thereof. 19. A process, as set forth in claim 15, comprising 100 total parts of said polyarylene and said crosslinkable copolymer wherein said R is methyl, said X is hydrogen, Y is oxygen, Q is hydrogen and n is 100 to 3000. 20. A process, as set forth in claim 19, wherein said polyarylene is present in an amount of 75 parts and said crosslinkable copolymer is present in an amount of 25 parts, said copolymer comprising a random copolymer containing maleic anhydride. 21. A process, as set forth in claim 20, wherein said copolymer comprises poly(styrene-co-maleic anhydride). 22. A process, as set forth in claim 21, wherein said silicon-containing amineterminated compound is aminopropyl terminated polydimethylsiloxane. 23. A process, as set forth in claim 21, wherein said silicon-containing amineterminated compound comprises aminopropyltriethoxysilane, silicon tetraethoxysilane and mixtures thereof. 24. A process, as set forth in claim 15, comprising 100 total parts of said polyarylene and said crosslinkable copolymer wherein said R is methyl, said X is hydrogen, Y is oxygen, one Q is bromine and the other Q is hydrogen and n is 100 to 3000. 25. A process, as set forth in claim 24, wherein said polyarylene is present in an amount of 100 parts and said crosslinkable copolymer is present in an amount of 25 parts, said copolymer comprising a random copolymer containing maleic anhydride. 26. A process, as set forth in claim 25, wherein said copolymer comprises poly(styrene-co-maleic anhydride). 27. A process, as set forth in claim 26, wherein said silicon-containing amineterminated compound is aminopropyl terminated polydimethylsiloxane. 28. A process, as set forth in claim 26, wherein said silicon-containing amineterminated compound comprises aminopropyltriethoxysilane, silicon tetraethoxysilane and mixtures thereof. 29. A process, as set forth in claim 15, wherein said mixture of gases comprises hydrogen, helium, oxygen, nitrogen, carbon monoxide, carbon dioxide, hydrogen sulfide, ammonia, water vapor and C 1 to C 4 hydrocarbons. 30. A process, as set forth in claim 29, wherein said mixture of gases comprises carbon dioxide and methane. 31. A process, as set forth in claim 30, wherein said permselective membrane composition has a carbon dioxide permeability of at least about 60 Barrers. 32. A process, as set forth in claim 31, wherein said permselective membrane composition has a selectivity of from about 15 to 25. 33. A process, as set forth in claim 15, wherein said separation of gases is conducted at a pressure of from about 0.10 to about 200 MPa.