Abstract
Alternating current conductivity σac, shear moduli G′, and ultraviolet-spectra (UV) were studied for gels consisting of two polydiacetylenes i.e., poly[4,6-decadiyn-1,10-diol-bis(n-butoxy-carbonylmethyl urethane)] abbreviated as P(3BCMU) and poly[5,7-dodecadiyn-1,12-diol-bis(n-butoxy carbonyl methylurethane)] abbreviated as P(4BCMU). As a common solvent of these polydiacetylenes, a mixed solvent p-dichlorobenzene (p-DCB)/toluene (TOL) (62/38) was used. Shear moduli G′ of blend gels decreased stepwise around 340 and 385 K which coincided with the gel-to-sol transition temperatures of pure P(4BCMU) and P(3BCMU) gels, respectively. At 385 K the blend gels transformed completely into sol. Observed G′ of blend gels conformed approximately to the additivity law with respect to the weight fraction of P(3BCMU) and P(4BCMU). This indicates that in the range of T<340 the gel network is composed of both the P(4BCMU) and P(3BCMU) molecules but above 340 K the network is composed only of the P(3BCMU) molecules. Temperature dependence of σac at 1 kHZ exhibited two maxima around 330 and 360 K. σac observed around 360 K was ca. ten times higher than σac expected from the additivity. The UV spectra of the blend gels exhibited abosorption bands not seen in pure gels of the components. It is speculated that the P(3BCMU) and P(4BCMU) chains partially form a charge transfer complex in blend gels.
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Chen, P., Adachi, K. & Kotaka, T. Electric Conductivity, Elasticity, and Optical Spectra in Blend Gels of Polydiacetylenes: P(3BCMU)/P(4BCMU)/Mixed Solvent System. Polym J 25, 473–479 (1993). https://doi.org/10.1295/polymj.25.473
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DOI: https://doi.org/10.1295/polymj.25.473