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Oriented PEN Crystal

Poly(ethylene naphthalate) (PEN) is under investigation as a model material for polymer dielectric films. An amorphous film of PEN was uniaxially stretched at a temperature of 100 °C to a draw ratio of 5.0. The film partially crystallized during the stretching process. Afterwards, the stretched films were annealed at 160 °C for 3 hours to induce further crystallization. By crystallizing the film in a stretched state, highly oriented polymer crystals were formed. Understanding the nanoscale morphology of polymer crystals is key to increasing the efficiency of capacitor films having polymeric dielectric layers.  (Photo Credit: Daniel Miranda)

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