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- W4307720719 abstract "Chain orientation, a natural consequence of polymer film processing, often leads to enhanced mechanical properties parallel to the machine extrusion direction (MD), while leaving the properties in the transverse direction (TD) unaffected or diminished, as compared to the unoriented material. Here, we report that mixing poly(ethylene oxide)-block-poly(butylene oxide) (PEO-PBO) diblock copolymer that forms dispersed particles in an amorphous polylactide (PLA) matrix produces uniaxially stretched blend films with enhanced toughness in both the MD and TD. Small-angle X-ray scattering experiments and visual observations revealed that the dominant deformation mechanism for blend films transitions from crazing to shear yielding in the MD as the stretching ratio increases, while crazing is the primary deformation mechanism in the TD at all stretching ratios investigated. As the films age at room temperature, crazing becomes more prevalent in the MD without compromising the improved toughness. The stretched blend films were susceptible to some degree of mechanical aging in the TD but remained fivefold tougher than stretched neat PLA films for up to 150 days. This work presents a feasible route to produce uniaxially stretched PEO–PBO/PLA films that are mechanically tough, which provides a more sustainable plastic alternative." @default.
- W4307720719 created "2022-11-05" @default.
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- W4307720719 date "2022-10-28" @default.
- W4307720719 modified "2023-09-24" @default.
- W4307720719 title "Enhanced Mechanical Properties of Uniaxially Stretched Polylactide/Poly(ethylene oxide)-<i>b</i>-Poly(butylene oxide) Blend Films" @default.
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- W4307720719 doi "https://doi.org/10.1021/acsapm.2c01634" @default.
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