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Solid State Ordering of Wholly Aromatic Copolyesters of Random Monomer Sequence

  • J. Blackwell (a1), A.-I. Schneider (a1) and C. M. McCullagh (a1)

Abstract

X-ray diffraction and computer molecular modeling Methods are being used to investigate the ordering of random sequence copolyesters when cooled for the nematic Melt. Data will be presented for the copolymers prepared from p-hydroxybenzoic acid (HBA) and 6-hydroxy-2-naphthoic acid. The non-periodic diffraction patterns arising from the random monomer sequences are also indicative of the presence of limited three dimensional order. For both polymer systems, we can generate the qualitative feature of the x-ray data using models in which short non-identical segments of 10–12 Monomers on adjacent chains are approximately in register at their center. Molecular Mechanics calculations show that mese non-identical sequences can be packed on the observed hexagonal lattice with only small energy differences when compared to analogous homopolymer structures. Data will also be presented showing how x-ray diffraction can be used to follow transesterification of copoly (HBA/HNA) in the nematic MelL

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Solid State Ordering of Wholly Aromatic Copolyesters of Random Monomer Sequence

  • J. Blackwell (a1), A.-I. Schneider (a1) and C. M. McCullagh (a1)

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