Nanomechanical properties of poly(para-phenylene vinylene) determined using quasi-static and dynamic nanoindentation

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

doi:10.1016/j.polymertesting.2014.04.012

Cited by 27 publications

(18 citation statements)

References 35 publications

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“…4(a). At 25 C, the reduced modulus of PPV is 4.4 ± 0.09 GPa, as reported previously [8]. As the test temperature was increased, there was an overall decrease in the reduced modulus values [see Fig.…”

Section: Quasi-static and Dynamic Nanoindentation Resultssupporting

confidence: 82%

“…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%

“…For deformations that recover in the time scale of the measurement, materials response is generally elastic, while for those that do not recover in the time scale of the measurement, the deformations are considered to be plastic. The plasticity index can be easily determined from the load-displacement curve using the formula: [8,29] j…”

Section: Hysteresis Energy Analysismentioning

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: 98%

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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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Section: Quasi-static and Dynamic Nanoindentation Resultssupporting

confidence: 82%

Section: Sample Preparationmentioning

confidence: 99%

Section: Hysteresis Energy Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

See 2 more Smart Citations

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

et al. 2015

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“…The mechanical properties of the PPV and PA films were determined by quasistatic and dynamic nanoindentation, using a previously reported procedure . PPV and PA films were cast on glass slides and converted under vacuum, at 250 and 200 °C, respectively, for 1 h. The nanoindentation tests were performed with a standard diamond Berkovich tip, using a load‐controlled ramp function with an 80 μN s –1 loading and unloading rate, a 400 μN peak load with a holding period of 2 s.…”

Section: Methodsmentioning

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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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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Polyetheretherketone, hexagonal boron nitride, and tungsten carbide cobalt chromium composite coatings: Mechanical and tribological properties

Lebga‐Nebane

Sankarasubramanian

Chojecki

et al. 2021

J of Applied Polymer Sci

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Composite powder coatings consisting of polyetheretherketone (PEEK), hexagonal boron nitride (hBN), and tungsten carbide cobalt chromium (WC-CoCr) particles were prepared by mechanical grinding and applied on steel substrates by thermal fusion of the thermoplastic polymer. The coatings contained about 20-60 vol% of hBN and WC-CoCr, and were designed to maximize modulus and hardness and minimize friction coefficient and wear rate. The mechanical and tribological properties of single-and double-layered coatings were characterized using nanoindentation and sliding friction and wear measurements. When the hBN concentration was about 30 vol%, the PEEK-hBN composite modulus was lower than that of neat PEEK, which is attributed to the disruption of PEEK crystallization by the filler particles. Upon the inclusion of WC-CoCr particles, the composite's modulus, and hardness showed a substantial increase beyond PEEK values. Elastic moduli of the mixed-filler systems were closer to the Reuss bound than the Voigt bound and could be correlated well with the coating composition using volume-fraction-weighted powers of component properties. Fitted values of the exponent (called the microstructural coefficient) were consistent with the expected continuity and connectivity of the composite's hard and soft phases. Viscoplastic energy dissipation increased with an increase in the polymer-filler interfacial area but decreased with the soft-phase volume fraction. The plasticity index was found to increase logarithmically with the coating modulus. The specific wear rate increased sharply beyond a composition-dependent critical value of the plasticity index. Mechanical polishing of the coating surfaces using abrasive slurries lowered the friction coefficient but increased the wear rate.

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Nanomechanical properties of poly(para-phenylene vinylene) determined using quasi-static and dynamic nanoindentation

Cited by 27 publications

References 35 publications

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

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

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

Polyetheretherketone, hexagonal boron nitride, and tungsten carbide cobalt chromium composite coatings: Mechanical and tribological properties

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