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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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