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Relations between morphology and micromechanical properties of alpha, beta and gamma phases of iPP
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SYSNO ASEP 0488784 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Relations between morphology and micromechanical properties of alpha, beta and gamma phases of iPP Author(s) Šlouf, Miroslav (UMCH-V) RID, ORCID
Pavlova, Ewa (UMCH-V) RID
Krejčíková, Sabina (UMCH-V)
Ostafinska, Aleksandra (UMCH-V) RID, ORCID
Zhigunov, Alexander (UMCH-V) RID, ORCID
Krzyžánek, Vladislav (UPT-D) RID, ORCID, SAI
Sowinski, P. (PL)
Piorkowska, E. (PL)Source Title Polymer Testing. - : Elsevier - ISSN 0142-9418
Roč. 67, May (2018), s. 522-532Number of pages 11 s. Language eng - English Country GB - United Kingdom Keywords polypropylene ; gamma-phase ; micromechanical properties Subject RIV CD - Macromolecular Chemistry OECD category Polymer science Subject RIV - cooperation Institute of Scientific Instruments - Electronics ; Optoelectronics, Electrical Engineering R&D Projects NV15-31269A GA MZd - Ministry of Health (MZ) TE01020118 GA TA ČR - Technology Agency of the Czech Republic (TA ČR) LO1507 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Institutional support UMCH-V - RVO:61389013 ; UPT-D - RVO:68081731 UT WOS 000432644900062 EID SCOPUS 85044586277 DOI 10.1016/j.polymertesting.2018.03.039 Annotation The relations between crystalline structure and micromechanical properties of alpha-, beta- and gamma-phase of isotactic polypropylene (iPP) were investigated. The iPP samples with various crystalline phase compositions were prepared by a controlled high-pressure crystallization that enabled us to obtain not only alpha-iPP and beta-iPP modifications, but also a series of almost pure gamma-iPP samples with gradually changing morphology, crystallinity and lamellar thickness. The micromechanical properties were assessed by instrumented microindentation hardness testing (MHI), from which we determined indentation hardness (HIT), indentation modulus (EIT), indentation creep (CIT) and elastic part of the indentation work (ηIT). It was demonstrated that gamma-iPP does not necessarily exhibit better mechanical performance than alpha- and beta-iPP, as suggested by some previous studies, because the final properties are strongly influenced not only by the phase composition (i.e. by the content of alpha-, beta- and gamma-phase), but also by the overall crystallinity. Workplace Institute of Macromolecular Chemistry Contact Eva Čechová, cechova@imc.cas.cz ; Tel.: 296 809 358 Year of Publishing 2019
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