New soluble aromatic polyimides

Frank W. Harris, Lien-Chung Hsu, Chung C. Tso

Research output: Contribution to conferencePaper

Abstract

2,2′-Bis (trifluoromethyl)-4,4′-diaminobiphenyl has been polymerized with pyromellitic dianhydride (PMDA), 3,3′, 4,4′-benzophenometetracarboxylic dianhydride (BPDA), biphenyl-3,3′, 4,4′-tetracarboxylic dianhydride (BPDA), diphenylsulfone-3,3′, 4,4′-tetracarboxylic dianhydride (DSDA), 4,4′-oxydiphthalic anhydride (ODPA), and 4,4′-perfluoroieopropylidinediphthalic anhydride (6FDA) in refluxing m-cresol containing isoquinoline. The polymer prepared from PMDA precipitated during the polymerization. The other polyimides either formed gel-like structures upon cooling to room temperature (BTDA- and BPDA-based) or remained in solution and were precipitated in methanol. The gels formed by the BTDA- and BPDA-based polymers displayed optical properties typical of lyotropic liquid-crystalline solutions. The polymers' intrinsic viscosities ranged from 0.6 to 4.8 dl/g. The Tg's of the polymers prepared from PMDA, BTDA and BPDA could not be detected, while the Tg's of the polymers prepared from DSDA, ODPA and 6FDA ranged from 270 to 320°C. The TGA thermograms of the polymers showed 5% weight losses between 540 and 590°C in air. Fibers have been spun from m-cresol solutions of the BPDA-based polymer that display properties similar to those of aromatic polyamides.

Original languageEnglish
Publication statusPublished - 1989 Dec 1
EventHigh Technology Conference on High Temperature Polymers and Their Uses - Cleveland, OH, USA
Duration: 1989 Oct 21989 Oct 4

Other

OtherHigh Technology Conference on High Temperature Polymers and Their Uses
CityCleveland, OH, USA
Period89-10-0289-10-04

Fingerprint

Polyimides
Polymers
Gels
Polyamides
Methanol
Optical properties
Display devices
Polymerization
Viscosity
Crystalline materials
Cooling
Fibers
Liquids
Air

All Science Journal Classification (ASJC) codes

  • Engineering(all)

Cite this

Harris, F. W., Hsu, L-C., & Tso, C. C. (1989). New soluble aromatic polyimides. Paper presented at High Technology Conference on High Temperature Polymers and Their Uses, Cleveland, OH, USA, .
Harris, Frank W. ; Hsu, Lien-Chung ; Tso, Chung C. / New soluble aromatic polyimides. Paper presented at High Technology Conference on High Temperature Polymers and Their Uses, Cleveland, OH, USA, .
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Harris, FW, Hsu, L-C & Tso, CC 1989, 'New soluble aromatic polyimides', Paper presented at High Technology Conference on High Temperature Polymers and Their Uses, Cleveland, OH, USA, 89-10-02 - 89-10-04.

New soluble aromatic polyimides. / Harris, Frank W.; Hsu, Lien-Chung; Tso, Chung C.

1989. Paper presented at High Technology Conference on High Temperature Polymers and Their Uses, Cleveland, OH, USA, .

Research output: Contribution to conferencePaper

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N2 - 2,2′-Bis (trifluoromethyl)-4,4′-diaminobiphenyl has been polymerized with pyromellitic dianhydride (PMDA), 3,3′, 4,4′-benzophenometetracarboxylic dianhydride (BPDA), biphenyl-3,3′, 4,4′-tetracarboxylic dianhydride (BPDA), diphenylsulfone-3,3′, 4,4′-tetracarboxylic dianhydride (DSDA), 4,4′-oxydiphthalic anhydride (ODPA), and 4,4′-perfluoroieopropylidinediphthalic anhydride (6FDA) in refluxing m-cresol containing isoquinoline. The polymer prepared from PMDA precipitated during the polymerization. The other polyimides either formed gel-like structures upon cooling to room temperature (BTDA- and BPDA-based) or remained in solution and were precipitated in methanol. The gels formed by the BTDA- and BPDA-based polymers displayed optical properties typical of lyotropic liquid-crystalline solutions. The polymers' intrinsic viscosities ranged from 0.6 to 4.8 dl/g. The Tg's of the polymers prepared from PMDA, BTDA and BPDA could not be detected, while the Tg's of the polymers prepared from DSDA, ODPA and 6FDA ranged from 270 to 320°C. The TGA thermograms of the polymers showed 5% weight losses between 540 and 590°C in air. Fibers have been spun from m-cresol solutions of the BPDA-based polymer that display properties similar to those of aromatic polyamides.

AB - 2,2′-Bis (trifluoromethyl)-4,4′-diaminobiphenyl has been polymerized with pyromellitic dianhydride (PMDA), 3,3′, 4,4′-benzophenometetracarboxylic dianhydride (BPDA), biphenyl-3,3′, 4,4′-tetracarboxylic dianhydride (BPDA), diphenylsulfone-3,3′, 4,4′-tetracarboxylic dianhydride (DSDA), 4,4′-oxydiphthalic anhydride (ODPA), and 4,4′-perfluoroieopropylidinediphthalic anhydride (6FDA) in refluxing m-cresol containing isoquinoline. The polymer prepared from PMDA precipitated during the polymerization. The other polyimides either formed gel-like structures upon cooling to room temperature (BTDA- and BPDA-based) or remained in solution and were precipitated in methanol. The gels formed by the BTDA- and BPDA-based polymers displayed optical properties typical of lyotropic liquid-crystalline solutions. The polymers' intrinsic viscosities ranged from 0.6 to 4.8 dl/g. The Tg's of the polymers prepared from PMDA, BTDA and BPDA could not be detected, while the Tg's of the polymers prepared from DSDA, ODPA and 6FDA ranged from 270 to 320°C. The TGA thermograms of the polymers showed 5% weight losses between 540 and 590°C in air. Fibers have been spun from m-cresol solutions of the BPDA-based polymer that display properties similar to those of aromatic polyamides.

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Harris FW, Hsu L-C, Tso CC. New soluble aromatic polyimides. 1989. Paper presented at High Technology Conference on High Temperature Polymers and Their Uses, Cleveland, OH, USA, .