TECHNOLOGY FOCUS - POLYMERS - Preferred Components: The dianhydride monomer includes 3,3'-diaminodiphenyl sulfone, 4,4'-diaminodiphenyl sulfone, 2,2'-bis(trifluoromethyl)4,4'-diaminobiphenyl, 2,2'-bis(difluoromethyl)4,4'-diaminodiphenyl ether, 2,2-bis(4-aminophenyl)hexafluoropropane, 2,2-bis(3-aminophenyl)hexafluoropropane, 1,3-bis(3-aminophenoxy)benzene, 4,4'-bis(3-aminophenoxy)diphenyl sulfone, 2,2-bis(4-(3-aminophenoxy)phenyl)hexafluoropropane, 1,3-bis(4-aminophenoxy)benzene, 1,3-bis(5-amino-3-difluoromethyl aminophenoxy)benzene, 4,4'-bis(2-difluoromethyl-4-phenoxy)benzene, 1,4-bis(2-methyl-4-amino-pentyl)-benzene, 2,2-bis(4-(2-difluoromethyl-4-aminophenoxy)phenyl)hexafluoropropane, 2,2-bis(4-(4-aminophenoxy)phenyl)hexafluoropropane, 9,9-bis(4-aminophenyl)fluorene and/or 1,3-bis(2-(4-aminophenyl)-2-propyl)benzene. Preferred Definitions:    Ar1=1-methyl-3-(m-tolylsulfonyl)benzene, 1-methyl-4-(p-tolylsulfonyl)benzene, 4-methyl-1-(4-methyl-2-(trifluoromethyl)phenoxy)-2-(trifluoromethyl)benzene, 4-methyl-1-(4-methyl-2-(trifluoromethyl)phenyl)-2-(trifluoromethyl)benzene, 1-methyl-3-(2,2,2-trifluoro-1-(m-tolyl)-1-(trifluoromethyl)ethyl)benzene, 1-methyl-4-(2,2,2-trifluoro-1-(p-tolyl)-1-(trifluoromethyl)ethyl)benzene, 1-methyl-3-(3-(3-methylphenoxy)phenoxy)benzene, 1-methyl-3-(4-(4-(3-methylphenoxy)phenyl)sulfonylphenoxy)benzene, 4-methyl-1-(3-(4-methyl-2-(trifluoromethyl)phenoxy)phenoxy)-2-(trifluoromethyl)benzene, 1-methyl-3-(4-(2,2,2-trifluoro-1-(4-(3-methylphenoxy)phenyl)-1-(trifluoromethyl)ethyl)phenoxy)benzene, 1-methyl-3-(3-(3-methyl-5-(trifluoromethyl)phenoxy)phenoxy)-5-(trifluoromethyl)benzene, 4-methyl-1-(4-(4-(4-methyl-2-(trifluoromethyl)phenoxy)phenyl)sulfonylphenoxy)-2-(trifluoromethyl)benzene, 1-methyl-3-(4-(4-(3-methyl-5-(trifluoromethyl)phenoxy)phenyl)sulfonylphenoxy)-5-(trifluoromethyl)benzene, 4-methyl-2-(trifluoromethyl)-1-(4-(2,2,2-trifluoro-1-(4-(4-methyl-2-(trifluoromethyl)phenoxy)phenyl)-1-(trifluoromethyl)ethyl)phenoxy)benzene, 1-methyl-3-(trifluoromethyl)-5-(4-(2,2,2-trifluoro-1-(4-(3-methyl-5-(trifluoromethyl)phenoxy)phenyl)-1-(trifluoromethyl)ethyl)phenoxy)benzene, 9,9-bis(p-tolyl)fluorene or 3,3-bis(p-tolyl)isobenzofuran-1-one.