We investigated, via small angle X-ray scattering (SAXS), the ordered-to-disordered transition temperature (TODT) of symmetric poly(3-dodecylthiophene)-block-poly(methyl methacrylate) copolymers (P3DDT-b-PMMA) with different molecular weights synthesized by anionic coupling reaction. When the molecular weight of P3DDT-b-PMMA was properly chosen, the TODT was observed within experimentally accessible temperature range (higher than the glass transition and melting temperature for PMMA and P3DDT, respectively, but lower than the thermal degradation temperature). We also measured the temperature dependence of Flory-Huggins interaction parameter (χ) between P3DDT and PMMA as χ = 0.1109 + 76.63/T, in which T is the absolute temperature.
Bibliographical noteFunding Information:
This work was supported by the National Creative Research Initiative Program supported by the National Research Foundation of Korea (NRF) . Small-angle X-ray scattering was performed at PLS beam line 9A and 4C supported by POSCO and KOSEF. We also thank Dr. Tae Joo Shin and Dr. Kyeong Sik Jin for helping SAXS experiment.
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- Ordered-to-disordered transition
- Rigid rod-flexible block copolymer
- Temperature dependence of interaction parameter