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*

*この研究の対応する著者

研究成果: Article査読

7 被引用数 (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.

本文言語English
ページ(範囲)125-133
ページ数9
ジャーナルPolymer
163
DOI
出版ステータスPublished - 2019 2月 1
外部発表はい

ASJC Scopus subject areas

  • 有機化学
  • ポリマーおよびプラスチック
  • 材料化学

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