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Faculty for Biology, Chemistry, and Earth Sciences

Macromolecular Chemistry I:

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Soluble aromatic polyamides and polyimides
Contact: Hans-Werner Schmidt, Reiner Giesa
This scheme illustrated the realization of the non-coplanar structure units in the monomer BPDA by the introduction of meta substituents. Additionally the linkage in the BPDA permits a cis configuration, which can be transferred into the linear trans configuration by external forces.

In general, rod-like polymers, due to strong enthalpic interactions and the minimal increase in conformational entropy associated with their dissolution or melting, are basically intractable or only processable under extreme conditions. To overcome these difficulties, structural modifications of the polymer backbone, such as bulky lateral substituents, flexible alkyl side-chains, non-coplanar biphenyl moieties, and kinked comonomers have been investigated to modify the properties. The majority of these structure-property investigations were studied on thermotropic aromatic polyesters and lyotropic polyamides. In comparison, investigations on rod-like aromatic polyimides are rather limited. This does not regard the potential of these materials for high modulus, high strength fibers or materials with low thermal expansion coefficients.

List of publications

Schmitt, G.; Eiselt, P.; Giesa, R.; Schmidt, H.-W.: Synthesis and properties of para-linked aromatic polycondensates containing 3,3 ,4,4 -biphenyltetracarboxylic-N,N-bis(4-aminobiphenyl) diimide units, Macromolecular Chemistry and Physics, 200, 1879-1888 (1999)
Yeo, S.-D.; Debenedetti, P.G.; Radosz, M.; Giesa, R.; Schmidt, H.-W.: Supercritical Antisolvent Process for a Series of Substituted Para-Linked Aromatic Polyamides, Macromolecules, 28, 1316-1317 (1995)
Eiselt, P.; Denzinger, S.; Schmidt, H.-W.: Liquid crystalline model compounds based on 3,3',4,4'-biphenyltetracarboxylic dianhydride (BPDA), Liquid Crystals 18(2), 257-262 (1995)
Hatke, W.; Schmidt, H.-W.: Synthesis, structure-property relations and lyotropic behavior of perfluoroalkyl-substituted para-linked aromatic polyamides, Macromolecular Chemistry and Physics, 195, 3579-3595 (1994)
Eiselt, P.; Giesa, R.; Schmidt, H.-W.: Liquid Crystalline Model Compounds and Aromatic Copolyimides Based on 3,3',4,4'-Biphenyltetracarboxylic Dianhydride (BPDA), Polymer Preprints of the American Chemical Society, 35(1), 505 (1994)
Hatke, W.; Schmidt, H.-W.: Synthesis and Properties of Perfluoroalkyl Substituted Para-Linked Aromatic Polyamides, ANTEC Society of Plastic Engineers 39, 1908-1910 (1993)
Giesa, R.; Keller, U.; Eiselt, P.; Schmidt, H.-W.: Synthesis and Thermal Properties of Aryl-Substituted Rod-Like Polyimides, Journal of Polymer Science Part A: Polymer Chemistry, 31, 141-151 (1993)
Hatke, W.; Schmidt, H.-W.: Structure-Property Relations of Perfluoroalkyl Substituted Rod-like Aromatic Polyamides, Polymer Preprints of the American Chemical Society, 33(2), 321 (1992)
Giesa, R.; Keller, U.; Schmidt, H.-W.: Synthesis and Structure-Property Relations of Arylsubstituted Rod-like Polyimides, Polymer Preprints of the American Chemical Society, 33(1), 396 (1992)
Hatke, W.; Schmidt, H.-W.: Structure-Property Relations and Processing of Rod-Like Aromatic Polyamides, Makromolekulare Chemie - Macromolecular Symposia, 50, 41-53 (1991)
Hatke, W.; Land, H.-T.; Schmidt, H.-W.; Heitz, W.: Influence of aryl substituents on the thermal and solubility behavior of poly(p-phenylene terephthalate) and poly(p-phenylene terephthalamide), Makromolekulare Chemie Rapid Communications, 12, 235-243 (1991)
Hatke, W.; Schmidt, H.-W.; Heitz, W.: Substituted Rod-like Aromatic Polyamides: Synthesis and Structure-Property Relations, Journal of Polymer Science Part A: Polymer Chemistry, 29, 1387-1398 (1991)
Hatke, W.; Schmidt, H.-W.: Novel Biphenyl Substituents for Highly Soluble and Amorphous Liquid Crystalline Polyesters and Polyamides, Polymer Preprints of the American Chemical Society, 32(1), 214 (1991)

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