Structure,molecular orientation,and resultant mechanical properties in core/ sheath poly(lactic acid)/polypropylene composites |
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Authors: | Sara A Arvidson Ka C Wong Russell E Gorga Saad A Khan |
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Affiliation: | 1. Department of Chemical and Biomolecular Engineering, Campus Box 7905, North Carolina State University, Raleigh, NC 27695, USA;2. Department of Materials Science and Engineering, Campus Box 7907, North Carolina State University, Raleigh, NC 27695, USA;3. Analytical Instrumentation Facility, Campus Box 7531, North Carolina State University, Raleigh, NC 27695, USA;4. Department of Textile Engineering, Chemistry and Science, Campus Box 8301, North Carolina State University, Raleigh, NC 27695, USA |
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Abstract: | We study the coaxial spinning of poly(lactic acid) (PLA) with polypropylene (PP) in a core/sheath configuration. PPcore/PLAsheath and PLAcore/PPsheath fibers maintain the high breaking strength that PP and PLA exhibit individually, showing marked improvement in strength over previous reports of PP/PLA blend fibers. Crystalline morphologies are greatly affected by the location within the fiber (i.e., core, sheath, or spun individually), and hence, co-spinning provides a route to tailor the morphology and fiber diameter beyond that available with single component fibers. A new approach to estimate molecular orientation of core sheath fibers based on the tensile response of the fiber is developed, and indicates that co-spinning PP with PLA results in a synergistic effect with increases in the molecular orientation above that which is possible with spinning either PP or PLA individually. |
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