371257 Nanomechanical Properties of Poly(para-phenylene vinylene) Determined Using Quasi-Static and Dynamic Nanoindentation

Wednesday, November 19, 2014: 1:45 PM
International 9 (Marriott Marquis Atlanta)
Sitaraman Krishnan1, Arvind Sreeram1, Nimitt G. Patel2, Ramaswamy Ishwar Venkatanarayanan1, Philip Yuya2, John B. McLaughlin1 and Stephan J. DeLuca3, (1)Department of Chemical and Biomolecular Engineering, Clarkson University, Potsdam, NY, (2)Department of Mechanical and Aeronautical Engineering, Clarkson University, Potsdam, NY, (3)Energy Materials Corporation, Inc., Norcross, GA

Mechanical properties of poly(p-phenylene vinylene) (PPV) conjugated polymer were determined by quasi-static and dynamic nanoindentation [1]. PPV films were prepared by thermolytic conversion of poly[p-phenylene (tetrahydrothiophenium)ethylene chloride] precursor films, at different temperatures. The mechanical properties of the films showed a dependence on the extent of conversion and chemical composition of the films. The storage modulus, Er', and plasticity decreased with an increase in conversion, whereas the loss modulus, Er", showed the opposite trend. Both the precursor and the fully-converted PPV films were found to have significantly lower Er" than Er', consistent with the glassy nature of the polymers at room temperature. The fully-converted PPV polymer was found to have room-temperature loss and storage moduli of 0.2 and 4.4 GPa, respectively. A comparison of the contact mechanical properties of the isotropic PPV films synthesized in this work, with the results of molecular dynamics simulations, and with previously reported values for stretch-oriented anisotropic films determined by conventional tensile testing methods, will also be discussed.

[1] Sreeram, A.; Patel, N. G.; Venkatanarayanan, R. I.; McLaughlin, J. B.; DeLuca, S. J.; Yuya, P. A.; Krishnan, S. Nanomechanical properties of poly(para-phenylene vinylene) determined using quasi-static and dynamic nanoindentation, Polymer Testing, In press. DOI: 10.1016/j.polymertesting.2014.04.012.

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