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Dynamic mechanical and thermal behavior of novel liquid-crystalline polybutadiene-diols with azobenzene groups in side chains
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10.1122/1.4815980
/content/sor/journal/jor2/57/5/10.1122/1.4815980
http://aip.metastore.ingenta.com/content/sor/journal/jor2/57/5/10.1122/1.4815980

Figures

Image of FIG. 1.
FIG. 1.

The structure of the synthesized LC thiols and and the PBD used for the grafting reactions of these thiols.

Image of FIG. 2.
FIG. 2.

POM images of thiol [(a) 90 °C, heating run] and related PBDs [(b) 25 °C, cooling run], [(c) 25 °C, cooling run], and [(d) 72 °C, cooling run]. Width of these pictures is 350 m.

Image of FIG. 3.
FIG. 3.

DSC curves for neat PBD and PBDs grafted with thiol (a) and with thiol (b). Data collected from cooling run, rate 10 °C/min.

Image of FIG. 4.
FIG. 4.

POM images of thiol at 97 °C [(a) Schlieren texture, (b) marbled nematic texture; heating run] and N → Cr transition of polymer [(c) 78 °C, (d) 76 °C, (e) 74 °C, (f) 60 °C, cooling run]. Width of pictures is 350 m.

Image of FIG. 5.
FIG. 5.

Temperature dependences of moduli , , and loss tangent tan for LC PBDs (a), (b), and (c). Measured at  = 1 Hz, cooling rate 2 °C/min.

Image of FIG. 6.
FIG. 6.

Temperature dependences of moduli , , and loss tangent tan for PBDs (a) and (b). Measured at  = 1 Hz, cooling rate 2 °C/min.

Image of FIG. 7.
FIG. 7.

Raw data for and vs. frequency of the PBDs (a) and (b). Data collected during cooling regime,  = 20 °C. Close symbols – , open symbols – .

Image of FIG. 8.
FIG. 8.

Log vs. temperature for the neat PBD (✷) and PBDs (▪), (•) and (△). Solid lines follow the WLF-dependencies.

Image of FIG. 9.
FIG. 9.

Dependencies of the superimposed moduli , , and tan on reduced frequency for the samples (a), (b), and (c). Data collected during cooling regime. Grey field presents the real frequency window (corresponding to  = 20 °C).

Tables

Generic image for table
TABLE I.

DSC-data of the thiol , neat PBD, and PBDs grafted by thiol ( –degree of modification, estimated from elemental analysis). Heating and cooling rate was 10 °C/min.

Generic image for table
TABLE II.

DSC-data of the thiol , neat PBD, and PBDs grafted by thiol (  – degree of modification, calculated from elemental analysis). Heating and cooling rate was 10 °C/min.

Generic image for table
TABLE III.

Constants of WLF equation and free volume parameters for the neat PBD and selected LC PBDs. was 20 °C.

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/content/sor/journal/jor2/57/5/10.1122/1.4815980
2013-07-24
2014-04-20
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Dynamic mechanical and thermal behavior of novel liquid-crystalline polybutadiene-diols with azobenzene groups in side chains
http://aip.metastore.ingenta.com/content/sor/journal/jor2/57/5/10.1122/1.4815980
10.1122/1.4815980
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