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The strain rate at which the film is stretched does not have an effect on the final particle shape. Spherical microparticles were stretched at 70 °C to a 2 fold length in one dimension at a strain rate of (A) 0.2/min (B) 0.4/min, (C) 0.8/min, (D) 1.6/min, and (E) 3.2/min (F) Aspect ratio analysis reveals there was not an effect of the strain rate.
