Uniaxial extension of PLA using fully automated on-line birefringence coupled with true stress - true strain measurement - part II: temperature effects
The effect of temperature on the fundamental deformation-structure relationships in amorphous Poly(lactic acid) (PLA) melt cast films was investigated using a stretch birefringence apparatus that allows for direct measurement of true stress, true strain, and birefringence. The crystalline phase behavior was elucidated with WAXD and DSC. The relationships between stress, strain, and birefringence, and structure are strongly affected by the stretching temperature. The effects of temperature on molecular mechanisms of this deformation and structural development are elucidated in this study.