Thermogravimetric study of the kinetics of formation of poly(para-phenylene vinylene) by thermal conversion of a sulfonium precursor

Sreeram, Arvind; Patel, Nimitt G.; Venkatanarayanan, Ramaswamy I.; DeLuca, Stephan J.; Yuya, Philip A.; Krishnan, Sitaraman

doi:10.1016/j.polymertesting.2014.05.011

Cited by 7 publications

(11 citation statements)

References 30 publications

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“…Synthesis of Poly( p ‐phenylene vinylene) : PPV films were prepared on glass substrates using solution casting and thermolytic conversion of the poly[ p ‐phenylene(tetrahydrothiophenium)ethylene chloride] (PPTHEC) polymer, as reported previously . The concentration of the precursor polymer (PPTHTEC) in the solution used for casting the films was about 1.7 wt%.…”

Section: Methodsmentioning

confidence: 99%

“…Wèry et al on the other hand, reported much lower glass transition temperatures for PPV prepared using the Wessling route. In the Wessling method of synthesis, a poly( p ‐xylene‐ α ‐dialkylsulfonium halide) precursor, synthesized from a α , α ′‐bis(dialkylsulfonium) salt, is thermolytically converted to PPV . Using modulated DSC experiments, they found that the T g of PPV was sensitive to the thermal conversion temperature, T conv , used to prepare the polymer.…”

Section: Introductionmentioning

confidence: 99%

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Simulated Dilatometry and Static Deformation Prediction of Glass Transition and Mechanical Properties of Polyacetylene and Poly(para‐phenylene vinylene)

Venkatanarayanan

Krishnan

Sreeram

et al. 2016

Macro Theory & Simulations

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Thermophysical and mechanical properties of two conjugated polymers, poly(p‐phenylene vinylene) (PPV) and polyacetylene (PA), are predicted using molecular dynamics simulations and compared with results obtained from differential scanning calorimetry, nanoindentation, and dynamic mechanical analysis experiments. Glass transition temperature (Tg) is calculated from the changes in the slopes of the specific volume versus temperature and cohesive energy density versus temperature plots, obtained from constant pressure and constant temperature simulations (NPT ensemble). The effects of temperature on the torsion angle distributions and characteristic ratio are analyzed. PPV is found to have a Tg of 416 ± 8 K. PA does not exhibit a glass transition in the temperature range of 120 to 500 K. Using the static deformation method, the values of Young's modulus are calculated to be 1.81 ± 0.34 GPa for PA and 9.20 ± 0.57 GPa for PPV at 298 K. These values are in good agreement with the experimental measurements, validating the suitability of these techniques in the prediction of the polymer properties.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Simulated Dilatometry and Static Deformation Prediction of Glass Transition and Mechanical Properties of Polyacetylene and Poly(para‐phenylene vinylene)

Venkatanarayanan

Krishnan

Sreeram

et al. 2016

Macro Theory & Simulations

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“…PPV films were prepared on glass substrates using solution casting and thermolytic conversion of the poly [p-phenylene (tetrahydrothiophenium)ethylene chloride] (PPTHEC) polymer, as reported previously [8,23]. The concentration of the precursor polymer (PPTHTEC) in the solution used for casting the films was about 0.7 wt%.…”

Section: Sample Preparationmentioning

confidence: 99%

“…The resulting films were found to be about 3 mm thick using contact profilometry (AMBIOS XP-2 Profilometer). The chemical compositions of the films were characterized using infrared spectroscopy, as reported previously, and the films were found to be free of chemical defects such as the presence of carbonyl groups [23].…”

Section: Sample Preparationmentioning

confidence: 99%

“…Despite the technological significance of poly(p-phenylenevinylene) (PPV) as an electroluminescent material [22], its basic properties, such as temperature-dependent storage and loss moduli, are unknown. We recently reported detailed analysis of the kinetics of formation of PPV using the precursor route [23], and the room temperature mechanical properties of the polymer film, synthesized at different temperatures, determined by nanoindentation [8]. In the present study, temperature dependent mechanical properties of fullyconverted PPV are investigated using high-temperature nanoindentation.…”

Section: Introductionmentioning

confidence: 97%

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Elevated temperature nanoindentation characterization of poly(para-phenylene vinylene) conjugated polymer films

et al. 2015

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a b s t r a c tTemperature dependent mechanical properties of poly(p-phenylene vinylene) (PPV) were investigated using quasi-static (QS) and dynamic nanoindentation (NI) at temperatures over the range of 25 to 100 C. The reduced modulus decreased from about 4.40 GPa to 3.64 GPa over this temperature range. The plasticity indices at all measurement temperatures were lower than the critical value of 0.875, characterizing material "sink-in", rather than "pile-up" during measurements. The plasticity index showed a non-monotonic trend, with a minimum value at around 70 C. Analysis of indentation stress relaxation data, obtained at different temperatures, was also performed using generalized Maxwell viscoelastic models. From these analyses, a relaxation mode, with a characteristic relaxation time of approximately 0.5 s, was evident. The characteristic time remained relatively unchanged over the temperature range of 25 to 100 C. However, the relaxation modulus associated with this mode showed the expected decrease with increase in temperature.

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Determining Young’s modulus of MEH-PPV film by fitting the unloading curve

Zhong

Yan

et al. 2018

Microsyst Technol

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Thermogravimetric study of the kinetics of formation of poly(para-phenylene vinylene) by thermal conversion of a sulfonium precursor

Cited by 7 publications

References 30 publications

Simulated Dilatometry and Static Deformation Prediction of Glass Transition and Mechanical Properties of Polyacetylene and Poly(para‐phenylene vinylene)

Simulated Dilatometry and Static Deformation Prediction of Glass Transition and Mechanical Properties of Polyacetylene and Poly(para‐phenylene vinylene)

Elevated temperature nanoindentation characterization of poly(para-phenylene vinylene) conjugated polymer films

Determining Young’s modulus of MEH-PPV film by fitting the unloading curve

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