In-Situ Synchrotron X-ray Study on the Structure Variation of Morphology-Identified Injection-Molded β-Nucleated iPP under Tensile Deformation

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 concentration...

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Autores principales:	Jianhong Chen, Konrad Schneider, Gert Heinrich
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	β-nucleated polypropylene morphological distribution deformation structure variation synchrotron X-ray Organic chemistry QD241-441
Acceso en línea:	https://doaj.org/article/bd327f9d37d54f3b9dc94ccb72a8d6c8
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spelling	oai:doaj.org-article:bd327f9d37d54f3b9dc94ccb72a8d6c82021-11-11T18:45:32ZIn-Situ Synchrotron X-ray Study on the Structure Variation of Morphology-Identified Injection-Molded β-Nucleated iPP under Tensile Deformation10.3390/polym132137302073-4360https://doaj.org/article/bd327f9d37d54f3b9dc94ccb72a8d6c82021-10-01T00:00:00Zhttps://www.mdpi.com/2073-4360/13/21/3730https://doaj.org/toc/2073-4360The 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 β-nucleating agent. It was found that under relatively high concentration of β-nucleating agent (i.e., ≥0.03 wt.%), the outer region (skin and shear region) of the iPP was dominated by mainly highly oriented α-phase as well as certain amount γ-phase, while the core region was rich in β-crystals with little if any orientation. The addition of the β-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 β-nucleating agent. The increased volume of void and cavity was associated with the β to α 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.Jianhong ChenKonrad SchneiderGert HeinrichMDPI AGarticleβ-nucleated polypropylenemorphological distributiondeformationstructure variationsynchrotron X-rayOrganic chemistryQD241-441ENPolymers, Vol 13, Iss 3730, p 3730 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	β-nucleated polypropylene morphological distribution deformation structure variation synchrotron X-ray Organic chemistry QD241-441
spellingShingle	β-nucleated polypropylene morphological distribution deformation structure variation synchrotron X-ray Organic chemistry QD241-441 Jianhong Chen Konrad Schneider Gert Heinrich In-Situ Synchrotron X-ray Study on the Structure Variation of Morphology-Identified Injection-Molded β-Nucleated iPP under Tensile Deformation
description	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 β-nucleating agent. It was found that under relatively high concentration of β-nucleating agent (i.e., ≥0.03 wt.%), the outer region (skin and shear region) of the iPP was dominated by mainly highly oriented α-phase as well as certain amount γ-phase, while the core region was rich in β-crystals with little if any orientation. The addition of the β-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 β-nucleating agent. The increased volume of void and cavity was associated with the β to α 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.
format	article
author	Jianhong Chen Konrad Schneider Gert Heinrich
author_facet	Jianhong Chen Konrad Schneider Gert Heinrich
author_sort	Jianhong Chen
title	In-Situ Synchrotron X-ray Study on the Structure Variation of Morphology-Identified Injection-Molded β-Nucleated iPP under Tensile Deformation
title_short	In-Situ Synchrotron X-ray Study on the Structure Variation of Morphology-Identified Injection-Molded β-Nucleated iPP under Tensile Deformation
title_full	In-Situ Synchrotron X-ray Study on the Structure Variation of Morphology-Identified Injection-Molded β-Nucleated iPP under Tensile Deformation
title_fullStr	In-Situ Synchrotron X-ray Study on the Structure Variation of Morphology-Identified Injection-Molded β-Nucleated iPP under Tensile Deformation
title_full_unstemmed	In-Situ Synchrotron X-ray Study on the Structure Variation of Morphology-Identified Injection-Molded β-Nucleated iPP under Tensile Deformation
title_sort	in-situ synchrotron x-ray study on the structure variation of morphology-identified injection-molded β-nucleated ipp under tensile deformation
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/bd327f9d37d54f3b9dc94ccb72a8d6c8
work_keys_str_mv	AT jianhongchen insitusynchrotronxraystudyonthestructurevariationofmorphologyidentifiedinjectionmoldedbnucleatedippundertensiledeformation AT konradschneider insitusynchrotronxraystudyonthestructurevariationofmorphologyidentifiedinjectionmoldedbnucleatedippundertensiledeformation AT gertheinrich insitusynchrotronxraystudyonthestructurevariationofmorphologyidentifiedinjectionmoldedbnucleatedippundertensiledeformation
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In-Situ Synchrotron X-ray Study on the Structure Variation of Morphology-Identified Injection-Molded β-Nucleated iPP under Tensile Deformation

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