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Calculation of a Mesogenic Index with Emphasis Upon LC-Polyimides

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Progress in Polyimide Chemistry II

Part of the book series: Advances in Polymer Science ((POLYMER,volume 141))

Abstract

The Mesogenic Index is an empirical method based on functional group contributions, in which the basic unit corresponds to a double bond. The method has been applied to a wide range of condensation polymer and copolymer types containing ester, amide, imide or carbonate groups. A second empirical concept, termed the “Mesogenic Length” has been introduced which has the effect of correcting the Index for random copolymers so that mesophases occur at approximately the same score (ca. 10) irrespective of the types or ratios of different linking groups in copolymers. It has been shown that an MI value of ca.10±0.5 is the borderline condition to predict whether it will contain a mesophase in the melt or in solution (subject to it being fusible or soluble). It has been demonstrated in this chapter that the condition for the mesophase applies to imide-containing polymers as well as esters, amide and carbonate polymers. The mesogenic length of the imide group was set at two, the same as a polyester, but overall polyimides are much less mesogenic than polyesters because aromatic linked rings are slightly kinked and score midway between the para- and meta-orientations. More specifically, MI threshold values around 9.5 seem to characterise PEIs, especially those containing NCPT or BPTI units, whereas a threshold value of 10 more closely characterises poly(amide-imide)s. Lower threshold values down to 9.3 have occasionally been observed with PEIs and as low as 9.1 for poly(carbonate-imide)s (PCI). Exceptionally, values below 9 have been observed with poly(carbonate-imide)s containing pyromellitic anhydride units. The low values are attributed to donor-acceptor interactions between neighbouring chains.

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Authors and Affiliations

  1. Upper Ifold, The Thatched Cottage, Dunsfold, Surrey, GU8 4NX, UK

    John G. Dolden

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Editors and Affiliations

  1. Inst. für Technische und Makromolekulare Chemie, Universität Hamburg, Bundesstraße 45, D-20146, Hamburg

    H. R. Kricheldorf

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Dolden, J.G. (1999). Calculation of a Mesogenic Index with Emphasis Upon LC-Polyimides. In: Kricheldorf, H.R. (eds) Progress in Polyimide Chemistry II. Advances in Polymer Science, vol 141. Springer, Berlin, Heidelberg. https://doi.org/10.1007/3-540-49814-1_4

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  • DOI: https://doi.org/10.1007/3-540-49814-1_4

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  • Print ISBN: 978-3-540-64963-2

  • Online ISBN: 978-3-540-49814-8

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