Thermal
studies on polythiophene containing mesogenic side chains

Radhakrishnan, S.; Somanathan, N.; Narashimhaswamy, T.; Thelakkat, Mukundan; Schmidt, Hans‐Werner

doi:10.1007/s10973-005-9985-1

Cited by 10 publications

(3 citation statements)

References 15 publications

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“…Particularly, LC polythiophene derivative is one of the most intriguing polymers, because its electrical and optical properties are expected to be controlled using molecular orientation of the LC side chain. A variety of polythiophenes containing liquid-crystalline mesogens and lightemitting chromophores have been prepared [27][28][29][30][31][32][33][34][35][36][37].…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Properties of Light-Emitting Polythiophene Derivatives Bearing Terphenyl Mesogenic Pendant

Chen

Zhou

et al. 2010

Molecular Crystals and Liquid Crystals

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A series of polythiophenes containing terphenyl mesogenic side chain at the third position through ester bonding was synthesized by dehalogenative polycondensation. The thiophene monomers 2,5-bromo-3-{[(4-(4 0 -cyano)terphenyloxy)carbonyl]-methyl]}-thiophene [M(CN)] and 2,5-bromo-3-{[(4-(4 0 -methoxy)terphenyloxy)-carbonyl]methyl}-thiophene [M(OCH 3 )] were prepared via Suzuki reation and esterification reactions, in sequence. The structures and properties of the monomers and polymers were characterized and evaluated with nuclear magnetic resonance, infrared spectroscopy, thermogravimetry, differential scanning calorimetry, polarized optical microscopy, ultraviolet spectroscopy, and photoluminescence. All of the polymers were stable, losing little of their weights when heated to !300 C. The polymers showed good solubility and could be dissolved in common solvents such as CHCl 3 , THF, DMF, etc. The monomers exhibited enantiotropic SmA d phases with a bilayer arrangement in the heating and cooling processes. Due to short spacer methylene ester between the bulk terphenyl mesogenic side chain and rigid polythiophene main chain, the polymers could not exhibit liquid crystallinty at elevated temperature. The existence of the chromophoric terphenyl core endows the polymers with high photoluminescence. When their CH 2 Cl 2 solutions were photoexcited, the polymers emitted a strong UV light about 400 nm.

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Section: Introductionmentioning

confidence: 99%

Synthesis and Properties of Light-Emitting Polythiophene Derivatives Bearing Terphenyl Mesogenic Pendant

Chen

Zhou

et al. 2010

Molecular Crystals and Liquid Crystals

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“…The integral procedural decomposition temperature (IPDT) as proposed by Doyle provides a semi-quantitative means for comparison of relative thermal stabilities [25][26][27]. The integral procedural decomposition temperature is derived as a means of summing up the whole shape of the normalized data curve.…”

Section: Resultsmentioning

confidence: 99%

Thermal Degradation Studies on Polyaniline–Polypyrrole Copolymers Prepared by Microemulsion Methods

2010

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Solvent-and water-based microemulsions of aniline and pyrrole copolymers were synthesized, and the thermal degradation properties of the copolymers were studied. The morphology of the copolymers prepared using solvent-based microemulsions containing 80 % aniline in the feed showed highly oriented, crystalline, ordered long nano-fibers which were even more structured than that of pure aniline prepared by the same method. The influence of the degree of crystallinity calculated from X-ray diffraction and morphology had an overlap with thermal degradation and activation energies of different transitions. Copolymers prepared with water-based microemulsions were thermally less stable than the ones prepared using solvent-based microemulsions. The concentration of pyrrole and aniline mutually influenced the thermal properties of the copolymers.

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“…The PTAPAB series and PAPTAB series compounds were synthesized by a multiple stage synthetic procedure was discussed elsewhere 8, 19, 20. The monomers of PTAPAB series were obtained from the coupling of alkoxy benzoyloxy anilines with thiophene‐3‐carboxaldehyde, and the PAPTAB series monomers were synthesized by reacting alkoxy phenoxy amino benzoates with thiophene‐3‐carboxaldehyde.…”

Section: Methodsmentioning

confidence: 99%

Physicomechanical studies on the langmuir‐blodgett films of polythiophene containing mesogenic side chains

Somanathan

Pandiyarajan

Goedel

et al. 2008

J Polym Sci B Polym Phys

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Liquid crystalline materials display unique properties, which can be exploited in various optoelectronic device applications. The Langmuir-Blodgett (LB) film characteristics of polythiophene model compounds containing phenyl rings linked with azomethine, ester, and alkoxy functional groups poly-4-{[(E)-thiophen-3ylmethylidene]amino}phenyl 4-alkyloxybenzoate (PTAPAB series) and poly-4-alkyloxy phenyl 4-{[(E)-thiophen-3-ylmethylidene]amino}benzoate (PAPTAB Series) were explored in this study. The AM1 optimized geometries of the aforementioned compounds showed that the films have different type of orientation in space because of the change in the linking functional group. The LB film characteristics were studied by applying the concepts of the failure mechanism in tensile failure. The compression-expansion hysteresis cycle of the LB films at predetermined area per repeat unit was used to study the viscous, elastic, and plastic nature of the films. The results showed that in PAPTAB series compounds, the LB films were more flexible and took less surface energy than its PTAPAB series homologues, which formed into LB films of rigid nature. The LB films of PAPTAB series compounds were of more viscoplastic in nature. The studies suggested that PAPTAB series structures exhibited good thin film forming nature than its PTAPAB series homologues.

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Thermal studies on polythiophene containing mesogenic side chains

Cited by 10 publications

References 15 publications

Synthesis and Properties of Light-Emitting Polythiophene Derivatives Bearing Terphenyl Mesogenic Pendant

Synthesis and Properties of Light-Emitting Polythiophene Derivatives Bearing Terphenyl Mesogenic Pendant

Thermal Degradation Studies on Polyaniline–Polypyrrole Copolymers Prepared by Microemulsion Methods

Physicomechanical studies on the langmuir‐blodgett films of polythiophene containing mesogenic side chains

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