The structure of the synthesized LC thiols MA and BA and the PBD used for the grafting reactions of these thiols.
POM images of thiol MA [(a) 90 °C, heating run] and related PBDs MA 0.2 [(b) 25 °C, cooling run], MA 0.6 [(c) 25 °C, cooling run], and MA 0.8 [(d) 72 °C, cooling run]. Width of these pictures is 350 μm.
DSC curves for neat PBD and PBDs grafted with thiol MA (a) and with thiol BA (b). Data collected from cooling run, rate 10 °C/min.
POM images of thiol BA at 97 °C [(a) Schlieren texture, (b) marbled nematic texture; heating run] and N → Cr transition of polymer BA 1.0 [(c) 78 °C, (d) 76 °C, (e) 74 °C, (f) 60 °C, cooling run]. Width of pictures is 350 μm.
Temperature dependences of moduli G′, G″, and loss tangent tan δ for LC PBDs MA 0.2 (a), MA 0.4 (b), and MA 0.8 (c). Measured at f = 1 Hz, cooling rate 2 °C/min.
Temperature dependences of moduli G′, G″, and loss tangent tan δ for PBDs BA 0.4 (a) and BA 0.8 (b). Measured at f = 1 Hz, cooling rate 2 °C/min.
Raw data for G′ and G″ vs. frequency of the PBDs MA 1.0 (a) and BA 0.4 (b). Data collected during cooling regime, T ref = 20 °C. Close symbols – G′, open symbols – G″.
Log a T vs. temperature for the neat PBD (✷) and PBDs MA 0.2 (▪), MA 0.4 (•) and MA 0.6 (△). Solid lines follow the WLF-dependencies.
Dependencies of the superimposed moduli G p ′, G p ″, and tan δ on reduced frequency for the samples MA 0.2 (a), MA 0.4 (b), and MA 0.6 (c). Data collected during cooling regime. Grey field presents the real frequency window (corresponding to T ref = 20 °C).
DSC-data of the thiol MA, neat PBD, and PBDs grafted by thiol MA (R e–degree of modification, estimated from elemental analysis). Heating and cooling rate was 10 °C/min.
DSC-data of the thiol BA, neat PBD, and PBDs grafted by thiol BA (R e – degree of modification, calculated from elemental analysis). Heating and cooling rate was 10 °C/min.
Constants of WLF equation and free volume parameters for the neat PBD and selected LC PBDs. T ref was 20 °C.
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