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- W2969274611 abstract "The combined effects of temperature and deformation on the segmental dynamics of poly(lactic acid) (PLA) glasses were investigated by using probe reorientation measurements. Constant strain rate deformations, with strain rates between 6 × 10–6 and 3 × 10–5 s–1, were performed on PLA glasses at temperatures between Tg – 15 K and Tg – 25 K. Deformation decreases the segmental relaxation time by up to a factor of 30 relative to the undeformed state. The segmental relaxation time in the postyield regime is related to the local strain rate via a power law, with exponents similar to those reported for lightly cross-linked PMMA. The Kohlrausch–Williams–Watts exponent, βKWW, commonly interpreted in terms of the width of the distribution of segmental relaxation times, changes from the undeformed state to the postyield regime, indicating a significant narrowing of the relaxation spectrum. We observe that βKWW is correlated to the deformation-induced increase of segmental mobility for PLA, as was reported for PMMA. ..." @default.
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- W2969274611 date "2019-08-19" @default.
- W2969274611 modified "2023-09-24" @default.
- W2969274611 title "Enhanced Segmental Dynamics of Poly(lactic acid) Glasses during Constant Strain Rate Deformation" @default.
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- W2969274611 doi "https://doi.org/10.1021/acs.macromol.9b01363" @default.
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