Polymer Engineering Faculty Research


Basic mechanisms of structural ordering in uniaxial stretching of PLA using fully automated on-line birefringence coupled with true stress - true strain measurement

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Fundamental deformation-structure relationships in melt cast amorphous Poly(lactic acid) (PLA) films were investigated using a stretch birefringence apparatus that allows for direct measurement of true stress, true strain, and birefringence at realistic strain rates. The relationships between stress, strain, and birefringence are strongly affected by the processing conditions: temperature, stretch ratio, and stretching rate. The molecular mechanisms of this deformation and the effects of process variables on these are elucidated in this study.

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