Synthesis and characterization of a nematic fully aromatic polyester based on biphenyl 3,4′-dicarboxylic acid

Katherine V. Heifferon, Glenn A. Spiering, Samantha J. Talley, Maruti Hegde, Robert B. Moore, S. Richard Turner, Timothy E. Long

Research output: Contribution to journalArticlepeer-review

Abstract

Melt acidolysis polymerization of hydroquinone with a kinked monomer, biphenyl 3,4′-bibenzoate, afforded a novel liquid crystalline polymer (LCP), poly(p-phenylene 3,4′-bibenzoate) (poly(HQ-3,4′BB)). Selection of hydroquinone diacetate (HQa) or hydroquinone dipivilate (HQp) facilitated either a tan or white final polymer, respectively. 1H NMR spectroscopy confirmed consistent polymer backbone structure for polymers synthesized with either derivative of hydroquinone. Poly(HQ-3,4′BB) exhibited the onset of weight loss at about 480 °C, similar to commercially available Vectra® LCP. Differential scanning calorimetry (DSC) and dynamic mechanical analysis (DMA) revealed a glass transition temperature (Tg) of 190 °C and an isotropic temperature (Ti) near 330 °C. The observation of a melting temperature (Tm) depended upon the thermal history of the polymer. Wide-angle X-ray scattering (WAXS) and polarized optical microscopy (POM) confirmed the formation of a nematic glass morphology after quench-cooling from the isotropic state. Subsequent annealing at 280 °C or mechanical deformation induced crystallization of the polymer. Rheological studies demonstrated similar shear thinning behavior for poly(HQ-3,4′BB) and Vectra® RD501 in the power law region at 340 °C. Zero-shear viscosity measurements indicated that HQa afforded higher melt viscosities after identical polymerization conditions relative to HQp, suggesting higher molecular weights.

Original languageEnglish (US)
Pages (from-to)4287-4296
Number of pages10
JournalPolymer Chemistry
Volume10
Issue number31
DOIs
StatePublished - Aug 21 2019
Externally publishedYes

ASJC Scopus subject areas

  • Bioengineering
  • Biochemistry
  • Polymers and Plastics
  • Organic Chemistry

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