Synthesis and orientation of fully aromatic polyimids via CVD polymerization and lyotropic precursor polymers

Project description:                                

Poly(amic ethyl ester)s, PAE, are used as precursors systems for polyimides. PAEs have improved solubilities, better resistance to hydrolytic degradation, yield high molecular weight products but suffer from higher and broader imidization temperatures. PAEs with para linkages exhibit lyotropic behavior of soluble, rigid-rod polyaramides. To elucidate systematically the structure-property relationships of lyotropic PAE systems, a series of new rod-like para linked PAEs was synthesized and characterized. All synthesized para-PAEs are completely soluble in NMP without the addition of inorganic salts such as LiCl. All PAEs turned opaque above 30 wt% in NMP and exhibited liquid crystalline behavior with a typical schlieren texture. Most systems for thermoreversible gels which have been further characterized by X-ray diffraction, FT-IR and SEM. The SEM micrograph at the left shows a typical morphology of the gel which is not observed in the meta analogue. Fiber spinning of the lyotropic solution and orientation behavior are currently under investigation.
The SEM micrograph above shows the wormlike morphology of a para-linked poly(amic ethyl)ester which was obtained from lyotropic solutions.

 

Equipment used in this project:                                                                                          
  • Solution spinning line

  • INSTRON Universal Tester

  • Olympus BX60 Polarizing Microscope

  • X-Ray and SEM Facilities

    • Publications and Patents:                                                                                                   

    Christian Neuber, Reiner Giesa, and Hans-Werner Schmidt, ACS Polym. Mater. Sci. Eng. 90, 294 (2004)
    Polyimide orientation layers prepared from lyotropic poly(amic ethyl ester)s

    Christian Neuber, Reiner Giesa, and Hans-Werner Schmidt, ACS Polym. Mater. Sci. Eng. 90, 574 (2004)
    Lyotropic para-linked aromatic poly(amic ethyl ester)s as precursors for polyimides and their fibers

    C. Neuber, R. Giesa, and H.-W. Schmidt, Adv. Funct. Mater. 13, 387-391 (2003).
    Polyimide orientation layers prepared from lyotropic aromatic poly(amic ethyl ester)s

    C. Neuber, R. Giesa, and H.-W. Schmidt, Macromol. Symp. 199, 253 (2003).
    Lyotropic para-linked aromatic poly(amic ethyl esters)
    Proceedings of the POLYCONDENSATION 2002 in Hamburg.

    C. Neuber, R. Giesa, and H.-W. Schmidt, Macromol. Chem. Phys. 203, 598 (2002)
    Synthesis and properties of lyotropic para-linked aromatic poly(amic ethyl ester)s

    C. Neuber, R. Giesa, and H.-W. Schmidt; Discussion meeting on Multi-Level Ordering covering
    Molecular Organization for Nanosystems, Kloster Banz, P-31, Feb. 2003
    Intrinsic oriented polyimdes as aligment layers for liquid crystals

    C. Neuber, H.-W. Schmidt, and R. Giesa; 6th European Symposium on Polyimides & High Performance Functional Polymers (STEPI 6) 2002, Montpellier, STEPI BOOK 2003, pp. 286-293
    Lyotropic para-linked aromatic poly(amic ethyl ester)s as precursors for rigid polyimids Abstract

    C. Neuber, H.-W. Schmidt, and R. Giesa; 6th European Symposium on Polyimides & High Performance Functional Polymers (STEPI 6) 2002, Montpellier, STEPI BOOK 2003, pp. 286-293
    Orientation of aromatic poly(amic ethyl ester)s and polyimids in thin films Abstract

    C. Neuber, R. Giesa, and H.-W. Schmidt, Bayreuth Polymer and Materials Research Symposium (BPS) 2001, Bayreuth (Germany), Abstr. Book p. PII-05
    Lyotropic para-Linked Aromatic Poly(amic ethyl ester)s
    Complete publication list
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