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Authors
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Chen, J. ; Schneider, K. ; Heinrich, G.
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Title
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In-situ synchrotron X-ray study on the structure variation of morphology-identified injection-molded ß-nucleated iPP under tensile deformation
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Date
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18.11.2021
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Number
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59805
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Abstract
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The deformation behavior of semi-crystalline polymers is strongly dependent on the morphology formed during processing. In this study, in-situ synchrotron X-ray was firstly used to identify the morphological distributions of injection-molded isotactic polypropylene (iPP) with different concentrations of ß-nucleating agent. It was found that under relatively high concentration of ß-nucleating agent (i.e., =0.03 wt.%), the outer region (skin and shear region) of the iPP was dominated by mainly highly oriented a-phase as well as certain amount ·-phase, while the core region was rich in ß-crystals with little if any orientation. The addition of the ß-nucleating agent was beneficial for the formation of lamellae with large lamellar stacking distance in the shear layer. Then the synchrotron X-ray was applied to study the structure variation of those morphology-identified samples under tensile deformation. It was found that voids and cavities along the stretching direction existed in the deformed iPP samples and their volume increased with increasing concentration of ß-nucleating agent. The increased volume of void and cavity was associated with the ß to a phase transition, which mainly occurred at the core region. In addition, upon stretching crystalline fragmentation and rearrangement took place following the formation of thinner lamellae.
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Publisher
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Polymers
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Wikidata
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Citation
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Polymers 13 (2021) Article Number: 3730
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DOI
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https://doi.org/10.3390/POLYM13213730
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