Electrical properties of urethane-substituted polydiacetylene

Yamao, Sinobu; Se, Kazunori; Kotaka, Tadao

doi:10.1016/0379-6779(87)90919-2

Cited by 4 publications

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“…In this work, we will address the importance of the second of the above factors in polydiacetylene oligomers. In fact, polydiacetylenes (PDAs) can be formed in single crystal, thin films, and solutions by topochemical reactions mechanisms, and despite that PDA crystal cannot be easily doped, a higher dopant concentration and efficient photo- or electro-chemical charge injections could be achieved in less crystalline systems, such as films, which show interesting electronic and conductivity properties . For these reasons, this class of conjugated oligomer/polymer can be of interest for their potential applications as optical materials …”

Section: Introductionmentioning

confidence: 99%

Evolution of the Bipolaronic Structure in Going From One- to Two-Dimensional π Model Systems

2008

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Long neutral and doubly charged oligodiacetylenes (with a maximum of 30 repeat units) as well as some of their aggregates have been studied in a semiempirical framework. By analyzing the plots of the one-electron ground-state density matrices, we have shown that the 12-units long oligomer is the borderline between two different behaviors of the electronic structure of the isolated charged systems. For oligomers shorter than this limit the bipolaronic structure is the dominant one, while for larger oligomers the polaron-pair structure is preferred. The major conclusion of this work concerns the effects of the interchain interactions in bipolaron systems, which are usually neglected in theoretical works. It is predicted that as a consequence of the latter in the bulk system a bipolaron generated on a single polymer chain will soon split into two polarons on adjacent chains.

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Section: Introductionmentioning

confidence: 99%

Evolution of the Bipolaronic Structure in Going From One- to Two-Dimensional π Model Systems

2008

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“…24, No. 10,1992 pendence of the a was measured at the heating or cooling rates of ca. 0.3 K min.- 1 Measurements of ultraviolet and visible light (UV-Vis) spectra were made by a spectrometer (Shimadzu UV-200).…”

Section: Methodsmentioning

confidence: 99%

Electric Conductivity and Phase Transition of a Polydiacetylene Gel: Poly[4,6-decadiyn-1,10-diol-bis(n-butoxy-carbonylmethyl urethane)] P(3BCMU)

Chen

Adachi

Kotaka

1992

Polym J

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ABSTRACT:Electric conductivity and sol-gel transition behavior were studied for gels of a polydiacetylene poly[ 4,6-decadiyn-1, I 0-diol-bis(n-butoxy-carbonylmethyl urethane)] abbreviated to P(3BCMU). Two solvents with different dielectric constant were used, i.e., a-dichlorobenzene (o-DCB) and a mixed solvent of p-dichlorobenzene (p-DCB) and toluene (TOL). Temperature dependence of the shear moduli G' was measured to determine the gel-to-sol transition temperatures T, at which the moduli decreased steeply. The T, was 378 Kin o-DCB and 387 Kin p-DCBITOL (62138). Both direct current (DC) conductivity o-d, and alternating current (AC) conductivity 0"30 at I kHz exhibited a maximum around 368 and 362 K in o-DCB and p-DCBITOL, respectively. Dopant effects of an electron acceptor iodine and a donor tetrathiafulvalene TTF on o-do and o-" were also studied. o-" was enhanced approximately by 100 times with iodine but only by 5 times with TTF. The pronounced dopant effect indicates that the conduction in the gel state is partly due to electronic conduction through the P(3BCMU) chains. We also observed an appreciable strength of ionic conductivity in the sol and gel phases. The ionic conductivity in the gel phase was estimated from o-30 of the solvent containing the ions extracted from the gel phase. Then observed o-a, and o-d, were separated into the contributions of ionic and electronic conductions. Electronic conductivity increased with increasing dielectric constant of the solvent. Transition temperature T, where the color changed from blue to yellow was also determined by measuring the transmittance at 630 nm wave length. The temperature dependence of the transmittance indicated a hysteresis.KEY WORDS Electric Conductivity I Sol-Gel Transition I Polydiacetylene I Gel I Poly[ 4,6-decadiyn-1,10-diol-bis(n-butoxycarbonylmethyl urethane)] I P(3BCMU) I Among conducting polymers, derivatives of polydiacetylene with a relatively long side group are unique in a sense that they are soluble in a variety of organic solvents and form gel in poor solvents. 1 -4 In our previous papers, 1 • 2 we reported behavior of the reversible sol-gel transition and electric conduction in toluene (TOL) solution of poly[5,7-dodecadiyn-1,12-diol-bis(n-butoxy carbonyl methylurethane)] abbreviated to P(4BCMU). The alternating current (AC) conductivity O'ac at 1kHz and the direct current (DC) conductivity O'dc of P(4BCMU)/TOL gel exhibited a broad maximum around 336 K. Above this temperature, the() ac and() de decreased steeply with increasing temperature and reached to a level of an insulator. The O'ac and O'dc were enhanced approximately 20 times by doping with iodine.

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Electrical conductivity of polydiacetylene, poly[5,7-dodecadiyn-1,12-diol-bis(n-butoxy carbonylmethyl urethane)] gel: 1. Sol-gel transition and conduction mechanism

Chen

Adachi

Kotaka

1992

Polymer

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Electrical properties of urethane-substituted polydiacetylene

Cited by 4 publications

References 4 publications

Evolution of the Bipolaronic Structure in Going From One- to Two-Dimensional π Model Systems

Evolution of the Bipolaronic Structure in Going From One- to Two-Dimensional π Model Systems

Electric Conductivity and Phase Transition of a Polydiacetylene Gel: Poly[4,6-decadiyn-1,10-diol-bis(n-butoxy-carbonylmethyl urethane)] P(3BCMU)

Electrical conductivity of polydiacetylene, poly[5,7-dodecadiyn-1,12-diol-bis(n-butoxy carbonylmethyl urethane)] gel: 1. Sol-gel transition and conduction mechanism

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