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Twist glass transition in regioregulated poly(3-alkylthiophenes)s

Koji Yazawa·Yoshio Inoue·Takakazu Yamamoto·Naoki Asakawa
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Abstract

The molecular structure and dynamics of regioregulated poly(3-butylthiophene) (P3BT), poly(3-hexylthiophene)(P3HT), and poly(3-dodecylthiophene) (P3DDT) were investigated using Fourier transform infrared absorption (FTIR), solid state $^{13}$C nuclear magnetic resonance (NMR), and differential scanning calorimetry (DSC) measurements. In the DSC measurements, the endothermic peak was obtained around 340 K in P3BT, and assigned to enthalpy relaxation that originated from the glass transition of the thiophene ring twist in crystalline phase from results of FTIR, $^{13}$C cross-polarization and magic-angle spinning (CPMAS) NMR, $^{13}$C spin-lattice relaxation time measurements, and centerband-only detection of exchange (CODEX) measurements. We defined this transition as {\it twist-glass transition}, which is analogous to the plastic crystal - glassy crystal transition.

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Koji Yazawa, Yoshio Inoue, Takakazu Yamamoto, Naoki Asakawa. 2006-08-21. Twist glass transition in regioregulated poly(3-alkylthiophenes)s. https://doi.org/10.1103/physrevb.74.094204

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