Structure dependence of photochromism and thermochromism of azobenzene-functionalized polythiophenes

Zhao, Xiongyan; Wang, M. Z.

doi:10.3144/expresspolymlett.2007.63

Cited by 11 publications

(10 citation statements)

References 14 publications

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“…Polymer sensors with specifi c properties or performances under various external stimuli for example, light, [1][2][3] temperature, [4][5][6] electricity, [ 7 ] etc., are practical for the daily life uses. In the past, many types of polymer sensors, e.g., optical polymer sensors, [ 2,3 ] electronic polymer sensors, [ 8,9 ] thermochromic polymer sensors, etc., [ 4,6,10 ] have been reported.…”

Section: Introductionmentioning

confidence: 99%

Shifting from Hydrogen Bond Network to π–π Stacking: A Key Mechanism for Reversible Thermochromic Sulfonated Poly(Ether Ether Ketone)

Jarumaneeroj

Tashiro²,

Chirachanchai

2014

Macromol. Rapid Commun.

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Sulfonated poly(ether ether ketone) (SPEEK) thin film performs reversible thermochromic property by developing the color to be yellowish at the temperature above 190 °C. The detailed analyses based on temperature-dependent techniques suggest the thermal treatment inducing the shifting of the hydrogen bond network between the sulfonated group and the hydrated water molecules to the π-π stacking among aromatic rings in SPEEK chains. Although it is general that the polymer chain packing is unfavorable at high temperature, the present work shows a good example that when the polymer chains can form specific molecular interaction, such as π-π stacking, even in harsh thermal treatment, a rearrangement will effectively occur, which leads to an external stimuli-responsive property.

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Section: Introductionmentioning

confidence: 99%

Shifting from Hydrogen Bond Network to π–π Stacking: A Key Mechanism for Reversible Thermochromic Sulfonated Poly(Ether Ether Ketone)

Jarumaneeroj

Tashiro²,

Chirachanchai

2014

Macromol. Rapid Commun.

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“…The polymerization process was confi rmed by the disappearance of the band at 745 cm -1 , which was attributable to C-H α out of plane deformation vibration of thiophene ring [18] . The spectral features of the ester derivative of acetaldehyde are seen in the spectrum, especially the band in the region 1745 -1600 cm -1 which can be attributed to the carbonyl (C = O) stretching vibration [19] and C-O-C stretching vibration [20] .…”

Section: Ftir Spectramentioning

confidence: 98%

Application of Vogel-Tamman-Fulcher (VTF) model to polythiophene composite thin films

Deshmukh

Shirbhate

Yawale³

2012

Journal of Polymer Engineering

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Synthesis of polymer composites poly (vinyl acetate) (PVAc) and polythiophene (PTh) was done by chemical oxidative method using FeCl 3 oxidant in methanol. Thin fi lms with PTh-PVAc polymer composite were prepared for 5.5, 10.4, 14.9, 18.9 and 22.5 wt % of iodine as a dopant. Direct current (DC) conductivity as a function of temperature (313 -363 K) was measured by the two probe method. Characterization of the sample was done via X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) and thermogravimetry (TG)/differential thermal analysis (DTA). The maximum value for DC electrical conductivity was found for 10.4 wt % ( σ = 9.78 × 10 -10 S cm -1 ). The decrease in conductivity for greater iodine concentrations may be due to reduced segmental motion. The temperature dependence conductivity shows percolative behavior and a clear cross over from Vogel-Tamman-Fulcher (VTF) to Arrhenius behavior. Ionic conduction decreased with increase in the concentration of iodine, which shows ionic charge transport. XRD of the samples showed an amorphous nature. FTIR spectra showed absorption in the range 550 -3600 cm -1 , which indicates various bands involved in the PTh-PVAc polymer composite with iodine doping. From TG/DTA studies, it was observed that all the samples with a different wt % of iodine showed degradation in a range 75 -81 % when heated up to 888 K.

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“…It is known, PC containing azo dyes based on the 8hydroxyquinoline have the photo induced optical anisotropy [15][16][17][18][19][20][21]. But, the electro-optical properties of PC containing of this dyes are not investigated to this day.…”

Section: Introductionmentioning

confidence: 99%

Some features of electro-optical properties of polymeric compositions doped with 8-hydroxyquinoline based azodyes and their cobalt complexes

Davidenko¹,

Давиденко²,

Savchenko³

et al. 2014

AIP Conference Proceedings

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Articles you may be interested inBroadband terahertz characterization of the refractive index and absorption of some important polymeric and organic electro-optic materials J. Appl. Phys. 109, 043505 (2011); 10.1063/1.3549120 Magnetism in Co-doped tris-8-hydroxyquinoline aluminum studied by first-principles calculations Appl. Phys. Lett. 96, 053304 (2010);Abstract. Polymeric composites based on the copolymer butyl methacrylate: nonyl methacrylate (3:1) doped 8hydroxyquinoline azo dyes with donor and acceptor substitutes and their complexes with cobalt are obtained. The influence of the external electric field on the polymeric films transmission of linear polarized light in the long-wave part of the azo dyes absorption range, (corresponding !!* azo fragments absorption range) and their metal complexes are observed. The influence of the electric field on the transmission is connected with the aligning forces for dipole moments of azobenzene groups and metal ions.

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Structure dependence of photochromism and thermochromism of azobenzene-functionalized polythiophenes

Cited by 11 publications

References 14 publications

Shifting from Hydrogen Bond Network to π–π Stacking: A Key Mechanism for Reversible Thermochromic Sulfonated Poly(Ether Ether Ketone)

Shifting from Hydrogen Bond Network to π–π Stacking: A Key Mechanism for Reversible Thermochromic Sulfonated Poly(Ether Ether Ketone)

Application of Vogel-Tamman-Fulcher (VTF) model to polythiophene composite thin films

Some features of electro-optical properties of polymeric compositions doped with 8-hydroxyquinoline based azodyes and their cobalt complexes

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