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Vývoj struktury alfa a beta-polypropylénu během UV ozáření: Víceúrovňové porovnání

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dc.title Vývoj struktury alfa a beta-polypropylénu během UV ozáření: Víceúrovňové porovnání cs
dc.title Structure evolution of alfa- and betha-polypropylenes upon UV irradiation: A multiscale comparison en
dc.contributor.author Obadal, Martin
dc.contributor.author Čermák, Roman
dc.contributor.author Raab, Miroslav
dc.contributor.author Verney, Vincent
dc.contributor.author Commereuc, Sophie
dc.contributor.author Fraïsse, Frédéric
dc.relation.ispartof Polymer Degradation and Stability
dc.identifier.issn 0141-3910 Scopus Sources, Sherpa/RoMEO, JCR
dc.date.issued 2005
utb.relation.volume 88
utb.relation.issue 1
dc.citation.spage 532
dc.citation.epage 539
dc.type article
dc.language.iso en
dc.publisher Elsevier en
dc.identifier.doi 10.1016/j.polymdegradstab.2004.12.014
dc.relation.uri https://www.sciencedirect.com/science/article/pii/S0141391005000078
dc.subject beta-polypropylen cs
dc.subject degradační kinetika cs
dc.subject fotooxidace cs
dc.subject specifická nukleace cs
dc.subject vývoj struktury cs
dc.subject beta-Polypropylene en
dc.subject Degradation kinetics en
dc.subject Photo-oxidation en
dc.subject Specific nucleation en
dc.subject Structure evolution en
dc.description.abstract Vliv UV ozáření v průběhu akcelerované fotodegradace na vývoj struktury alfa a beta-polypropylénu je náplní této práce. Strukturní vývoj je sledován pomocí řady experimentálních metod na molekulární, nadmolekulární a mikroskopické úrovni. Byl nalezen výrazný efekt nukleace - pouze 0.03 hm. % nukleantu výrazně zpomalil průběh fotodegradace. cs
dc.description.abstract The effects of UV irradiation on neat and ?-nucleated isotactic polypropylenes have been studied at the molecular, morphological and microscopic levels. Commercially available isotactic polypropylene (PP) was modified by a specific ?-nucleating agent based on N,N?-dicyclohexylnaphthalene-2, 6-dicarboxamide. Compression-moulded plates were prepared from both starting (?-PP) and nucleated (?-PP) polypropylenes and exposed to UV irradiation. The exposure time varied from 0 to 240 h. Molecular degradation and the evolution of supermolecular structure were determined using infrared spectroscopy, wide-angle X-ray scattering and differential scanning calorimetry en
dc.description.abstract surface cracking was observed by light microscopy. Lower degradability was found in ?-PP as compared to ?-PP en
dc.description.abstract an increase in crystallinity on short-time exposure followed by crystallinity decrease with prolonged exposure was detected in both samples. The ?-phase content in the crystalline portion of ?-PP remained stable during UV irradiation under given irradiation conditions. Re-melting experiments have shown that the crystallization ability of both ?-PP and ?-PP markedly decreased with exposure time. Lower degradability of ?-PP as compared to ?-PP has been ascribed to higher light absorbance resulting from the specific morphology of ?-PP. en
utb.faculty Faculty of Technology
dc.identifier.uri http://hdl.handle.net/10563/1000508
utb.identifier.rivid RIV/70883521:28110/05:63504257
utb.identifier.obdid 14053742
utb.identifier.scopus 2-s2.0-14844303752
utb.identifier.wok 000228789700022
utb.source j-riv
utb.contributor.internalauthor Obadal, Martin
utb.contributor.internalauthor Čermák, Roman
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