Tailoring the glassy mesophase range of thermotropic polyesters through copolymerization of 4,4’-bibenzoate and kinked isomer

Katherine V. Heifferon, Ryan J. Mondschein, Samantha J. Talley, Robert B. Moore, S. Richard Turner, Timothy Edward Long

研究成果: Article

2 引用 (Scopus)

抄録

The substitution of a linear biphenyl monomer with its meta isomer in liquid crystalline polyesters affords (co)polyesters with tunable liquid crystalline (LC) and thermomechanical properties. Melt transesterification afforded two (co)polyester series based on the semi-aromatic homopolymers poly(diethylene glycol 4,4′ bibenzoate) and poly(butylene 4,4′ bibenzoate) at high molecular weights. In each series, the linear dimethyl-4,4′ bibenzoate (4,4’BB) was systematically exchanged with its kinked isomer, dimethyl-3,4′ bibenzoate (3,4’BB). The incorporation of the meta isomer resulted in tunable crystalline and LC properties. Differential scanning calorimetry (DSC), wide angle X-ray scattering (WAXS), X-ray diffraction (XRD), and polarized optical microscopy (POM) elucidated that the kinked structure of 3,4’BB disrupted crystallization at low incorporations, significantly lowering the melting transition temperature (>50 °C) in each series. The LC properties were less impacted due to the biphenyl structure resulting in LC glasses with wide mesogenic windows. Dynamic mechanical analysis (DMA) further demonstrated the tunable nature of the thermomechanical properties resulting from the (co)polymerization of these isomers.

元の言語English
ページ(範囲)125-133
ページ数9
ジャーナルPolymer
163
DOI
出版物ステータスPublished - 2019 2 1
外部発表Yes

Fingerprint

Polyesters
Isomers
Copolymerization
Crystalline materials
Liquids
Transesterification
Dynamic mechanical analysis
Crystallization
Glycols
Homopolymerization
X ray scattering
Superconducting transition temperature
Optical microscopy
Melting point
Differential scanning calorimetry
Substitution reactions
Monomers
Molecular weight
X ray diffraction
Glass

ASJC Scopus subject areas

  • Organic Chemistry
  • Polymers and Plastics
  • Materials Chemistry

これを引用

Heifferon, K. V., Mondschein, R. J., Talley, S. J., Moore, R. B., Turner, S. R., & Long, T. E. (2019). Tailoring the glassy mesophase range of thermotropic polyesters through copolymerization of 4,4’-bibenzoate and kinked isomer. Polymer, 163, 125-133. https://doi.org/10.1016/j.polymer.2018.12.031

Tailoring the glassy mesophase range of thermotropic polyesters through copolymerization of 4,4’-bibenzoate and kinked isomer. / Heifferon, Katherine V.; Mondschein, Ryan J.; Talley, Samantha J.; Moore, Robert B.; Turner, S. Richard; Long, Timothy Edward.

:: Polymer, 巻 163, 01.02.2019, p. 125-133.

研究成果: Article

Heifferon, Katherine V. ; Mondschein, Ryan J. ; Talley, Samantha J. ; Moore, Robert B. ; Turner, S. Richard ; Long, Timothy Edward. / Tailoring the glassy mesophase range of thermotropic polyesters through copolymerization of 4,4’-bibenzoate and kinked isomer. :: Polymer. 2019 ; 巻 163. pp. 125-133.
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