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Naji, M. |
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Motta, Antonella |
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Aletan, Dirar |
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Mohamed, Tarek |
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Petrov, R. H. | Madrid |
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Kočí, Jan | Prague |
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Ali, M. A. |
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Rančić, M. |
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Ollier, Nadège |
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Azevedo, Nuno Monteiro |
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Landes, Michael |
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Amitay-Sadovsky, E.
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article
Mechanics and dynamics of transcrystalline alpha-isotactic polypropylene at the nanoscale
Abstract
Direct, spatially resolved, mechanical measurements on the transcrystalline phase formed near high modulus carbon fibers embedded in alpha -isotactic polypropylene are reported. A scanning force microscope has been implemented with two nonstandard modifications in order to probe both the Young's modulus and shear modulus at varying directions with respect to the lamellae growth direction. The experiments show an unequivocal anisotropy in both moduli, which varies with radial distance from the fiber. The results can be interpreted in terms of morphology of the polymer molecules and lamella stacks. The different probe size for the two measurements enables a separation of molecular and lamellae order.