Sixteen nematogenic copolyesters were synthesized from four to seven different aromatic reactants, with the objective of suppressing crystallization. The constituent units contained rod-like 1,4-phenylene and 4,4'-biphenylene groups, crankshaft 2,6-naphthylene group and rigid angular 1,3-phenylene group. Wide-angle X-ray diffraction, differential scanning calorimetry and hot-stage optical microscopy showed that five of the copolyesters could be classified as lacking three-dimensional order. Within the range of compositions studied, a large number of different units of different types is conducive to suppressing crystallization.
Посилання на статтю:
Therrnotropic polyesters: synthesis and properties of highly disordered copolyrners / J. Cao, G. Karayannidis*, J. E. Mclntyre and J. G. Tomka // Polymer. – 1993. – Vol 34. – P. 1471-1476.