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Sulfonated polyimide polymers incorporating bulky monomers are disclosed. The polymers have a liquid crystalline structure and exhibit high conductivity, high water uptake and water stability over a range of relative humidities and temperatures. The polymers are particularly adapted for use as a pol

Sulfonated polyimide polymers incorporating bulky monomers are disclosed. The polymers have a liquid crystalline structure and exhibit high conductivity, high water uptake and water stability over a range of relative humidities and temperatures. The polymers are particularly adapted for use as a polymer electrolyte membrane in fuel cells.

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Sulfonated polyimide polymers incorporating bulky monomers are disclosed. The polymers have a liquid crystalline structure and exhibit high conductivity, high water uptake and water stability over a range of relative humidities and temperatures. The polymers are particularly adapted for use as a pol

Sulfonated polyimide polymers incorporating bulky monomers are disclosed. The polymers have a liquid crystalline structure and exhibit high conductivity, high water uptake and water stability over a range of relative humidities and temperatures. The polymers are particularly adapted for use as a polymer electrolyte membrane in fuel cells. e. 16. The process as claimed in claim 1, wherein the reaction is performed under a deoxidized atmosphere. 17. The process as claimed in claim 1, wherein the reaction is performed under an argon atmosphere. 18. The process as claimed in claim 5, wherein an aliphatic dicarboxylic acid and an aliphatic diamine are used for the combinations of an aromatic dicarboxylic acid and an aromatic diamine, an aromatic dicarboxylic acid and analiphatic diamine, an aliphatic dicarboxylic acid and an aromatic diamine, or an aliphatic dicarboxylic acid and an aliphatic diamine. 19. The process as claimed in claim 18, wherein adipic acid and hexamethylenediamine are used as the aliphatic dicarboxylic acid and the aliphatic diamine. 20. The process as claimed in claim 18, wherein a solvent containing o-xylene is used as the solvent. 21. The process as claimed in claim 20, wherein a mixed solvent of o-xylene and m-cresol is used as the solvent containing o-xylene. 22. The process as claimed in claim 18, wherein a mixed solvent of o-xylene to m-cresol having a volume ratio of 70:30-90:10 is used as the mixed solvent of o-xylene and m-cresol. 23. The process as claimed in claim 18, wherein a mixed solvent of pentamethylbenzene and m-cresol is used as the solvent. 24. The process as claimed in claim 18, wherein the reaction is performed at 140-200° C. 25. The process as claimed in claim 18, wherein a mixed solvent of m-terphenyl and m-cresol is used as the solvent. 26. The process as claimed in claim 25, wherein the reaction is performed at 140-300° C. 27. A process of preparation of a condensed polymer by reacting a polycarboxylic acid and a polyamine, a polycarboxylic acid, a polyamine and an aminocarboxylic acid, or an aminocarboxylic acid, in the presence of a polycondensation catalyst and a solvent, wherein a solvent containing pentamethylbenzene is used as the polycondensation solvent. 28. The process as claimed in claim 27, wherein the condensed polymer is polyamide, polyimide, or polyamideimide. 29. The process as claimed in claim 27, wherein polyamide is prepared as the condensed polymer, and the polycarboxylic acid and the polyamine, the polycarboxylic acid, the polyamine and the aminocarboxylic acid, or the aminocarboxylic acid comprise any combination of an aromatic dicarboxylic acid and an aromatic diamine, an aromatic dicarboxylic acid and an aliphatic diamine, an aliphatic dicarboxylic acid and an aromatic diamine, or an aliphatic dicarboxylic acid and an aliphatic diamine. 30. The process as claimed in claim 29, wherein an aromatic dicarboxylic acid and an aromatic diamine are used as the combinations of an aromatic dicarbocylic acid and an aromatic diamine, an aromatic dicarboxylic acid and an aliphatic diamine, an aliphatic dicarboxylic acid and an aromatic diamine, or an aliphatic dicarboxylic acid and an aliphatic diamine. 31. The process as claimed in claim 30, wherein terephthalic acid and p-phenylenediamine are used as the aromaic dicarboxylic acid and the aromatic diamine. 32. The process as claimed in claim 29, wherein an aliphatic dicarboxylic acid and an aliphatic diamine are used as the combinations of an aromatic dicarboxylic acid and an aromatic diamine, an aromatic dicarboxylic acid and an aliphatic diamine, an aliphatic dicarboxylic acid and an aromatic diamine, or an aliphatic dicarboxylic acid and an aliphatic diamine. 33. The process as claimed in claim 32, wherein adipic acid and hexamethylenediamine are used as the aliphatic dicarboxylic acid and the aliphatic diamine. 34. The process as claimed in claim 27, wherein an aromatic tetracarboxylic acid and an aliphatic diamine are used as the polycarboxylic acid and the polyamine, the polycarboxylic acid and the polyamine and the aminocarboxylic acid, or the aminocarboxylic acid, and the condensed polymer is polyimide. 35. The process as claimed in claim 27, wherein an aromatic tricarboxylic acid and an aromatic diamine are used as the polycarboxylic acid and the polyamine, the polycarboxylic acid, the polyamine and the aminocarboxylic acid, or the aminocarboxylic acid and the condensed polymer is polyamideimide. 36. The process as claimed in claim 27, wherein a mixed solvent of pentamethylbenzene and N-methylpyrrolidinone is used as the solvent containing pentamethylbenzene. 37. The process as claimed in claim 36, wherein a mixed solvent of pentamethylbenzene and N-methylpyrrolidinone having a weight ratio of 70:30-90:10 is used as the mixed solvent of pentamethylbenzene and N-methylpyrrolidinone. 38. The process as claimed in claim 27, wherein a mixed solvent of pentamethylbenzene and m-cresol is used as the solvent containing pentamethylbenzene. 39. The process as claimed in claim 27, wherein an arylboric acid is used as the polycondensation catalyst. 40. The process as claimed in claim 39, wherein phenylboric acid with an electron-withdrawing group at least at one of the 3,4, and 5 positions is used as the arylboric acid. 41. The process as claimed in claim 40, wherein one or more arylboric acids selected from 3,4,5-trifluorophenylboric acid, 3-nitrophenylboric acid, 3,5-bis(trifluoromethyl)phenylboric acid, or 4-trifluoromethylphenylboric acid are used as the phenylboric acid with an electron-withdrawing group at least at one of the 3,4, and 5 positions. 42. The process as claimed in claim 27, wherein the reaction is performed under a deoxidized atmosphere. 43. The process as claimed in claim 27, wherein the reaction is performed under an argon atmosphere. 44. A polyamide compound prepared by polycondensation of an aromatic dicarboxylic acid and an aromatic diamine in the presence of an arylboric acid as a polycondensation catalyst and a mixed solvent of pentamethylbenzene and N-methylpyrrolidinone. 45. A polyimide compound prepared by polycondensation of an aromatic tetracarboxylic acid and an aromatic diamine in the presence of an arylboric acid as a polycondensation catalyst and a mixed solvent of pentamethylbenzene and N-methylpyrrolidinone. 46. A polyamideimide compound prepared by polycondensation of an aromatic tricarboxylic acid and an aromatic diamine in the presence of an arylboric acid as a polycondensation catalyst and a mixed solvent of pentamethylbenzene and N-methylpyrrolidinone. 47. A process of preparation of a condensed polymer by reacting a polycarboxylic acid and a polyamine, a polycarboxylic acid, and a polyamine and an aminocarboxylic acid, or an aminocarboxylic acid in the presence of a polycondensation catalyst and a solvent containing m-terphenyl is used as the solvent. 48. The process as claimed in claim 47, wherein polyamide, polyimide, or polyamidimide is prepared as the polycondensed polymers. 49. The process as claimed in claim 47, wherein the condensed polymer is polyamide, and the polycarboxylic acid and the polyamine, the polycarboxylic acid, and the polyamine and the aminocarboxylic acid, or the aminocarboxylic acid comprises any combination of an aromatic dicarboxylic acid and an aromatic diamine, an aromatic dicarboxylic acid and an aliphatic diamine, an aliphatic dicarboxylic acid and an aromatic diamine or an aliphatic dicarboxylic acid and an aliphatic diamine. 50. The process as claimed in claim 49, wherein an aromatic dicarboxylic acid and an aromatic diamine are used as the combination of an aromatic dicarboxylic acid and an aromatic diamine, an aromatic dicarboxylic acid and an aliphatic diamine, an aliphatic dicarboxylic acid and an aromatic diamine, or an aliphatic dicarboxylic acid and an aliphatic diamine. 51. The process as claimed in claim 50, wherein terephthalic acid and p-phenylenediamine are used as the aromatic dicarboxylic acid and the aromatic diamine. 52. The process as claimed in claim 49, wherein an aliphatic dicarboxylic acid and an aliphatic diamine are used as the combinations of an aromatic dicarboxylic acid and an aromatic diamine, an aromatic dicarboxylic acid and an aliphatic diamine, an aliphatic dicarboxylic acid and an aromatic diamine, or an aliphatic dicarboxylic acid and an aliphatic diamine. 53. The process as claimed in claim 52, wherein adipic acid and hexamethylenediamine are used as the aliphatic dicarboxylic acid and the aliphatic diamine. 54. The process as claimed in claim 47, wherein the condensed polymer is polyimide, and the polycarboxylic acid and the polyamine, the polycarboxylic acid and the polyamine and the aminocarboxylic acid or the aminocarboxylic acid comprises an aromatic tetracarboxylic acid and an aliphatic diamine. 55. The process as claimed in claim 47, wherein the condensed polymer is polyamideimide, and the polycarboxylic acid and the polyamine, the polycarboxylic acid, the polyamine and the aminocarboxylic acid or the aminocarboxylic acid comprises an aromatic tricarboxylic acid and an aromatic diamine. 56. The process as claimed in claim 47, wherein a mixed solvent of m-terphenyl and N-butylpyrrolidinone is used as the solvent containing m-terphenyl. 57. The process as claimed in claim 56, wherein a mixed solvent of m-terphenyl and N-butylpyrrolidinone having a weight ratio of 3:1-10:1 is used as the mixed solvent of m-terphenyl and N-butylpyrrolidinone. 58. The process as claimed in claim 47, wherein a mixed solvent of m-terphenyl and m-cresol is used as the solvent containing m-terphenyl. 59. The process as claimed in claim 47, wherein an arylboric acid is used as the polycondensation catalyst. 60. The process as claimed in claim 59, wherein phenylboric acid with an electron-withdrawing group at least at one of the 3,4, and 5 positions is used as the arylboric acid. 61. The process as claimed in claim 60, wherein one or more arylboric acids selected from3,4,5-trifluorophenylboric acid, 3-nitrophenylboric acid, 3,5-bis(trifluoromethyl)phenylboric acid, 4-trifluorophenylboric acid are used as the phenylboric acid with an electron-withdrawing group at least at one of the 3,4, and 5 positions. 62. The process as claimed in claim 47, wherein the reaction is performed under a deoxidized atmosphere. 63. The process as claimed in claim 47, wherein the reaction is performed under an argon atmosphere. 64. A polyamide compound prepared by polycondensation of an aromatic dicarboxylic acid and an aromatic diamine in the presence of an arylboric acid as a polycondensation catalyst and a mixed solvent of m-terphenyl and N-butylpyrrolidinone. 65. A polyimide compound prepared by polycondensation of an aromatic tetracarboxylic acid and an aromatic diamine in the presence of an arylboric acid as a polycondensation catalyst and a mixed solvent of m-terphenyl and N-butylpyrrolidinone. 66. A polyamideimide compound prepared by polycondensation of an aromatic tricarboxylic acid and an aromatic diamine in the presence of an arylboric acid as a polycondensation catalyst and a mixed solvent of m-terphenyl and N-butylpyrrolidinone.