Structure evolution of alfa- And betha-polypropylenes upon UV irradiation: A multiscale comparison
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F70883521%3A28110%2F05%3A63504257" target="_blank" >RIV/70883521:28110/05:63504257 - isvavai.cz</a>
Result on the web
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DOI - Digital Object Identifier
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Alternative languages
Result language
angličtina
Original language name
Structure evolution of alfa- And betha-polypropylenes upon UV irradiation: A multiscale comparison
Original language description
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; surface cracking was observed by light microscopy. Lower degradability was found in ?-PP as compared to ?-PP; 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 irr
Czech name
Vývoj struktury alfa a beta-polypropylénu během UV ozáření: Víceúrovňové porovnání
Czech description
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.
Classification
Type
J<sub>x</sub> - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)
CEP classification
CD - Macromolecular chemistry
OECD FORD branch
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Result continuities
Project
<a href="/en/project/ME%20647" target="_blank" >ME 647: Structure and morphology of polymers.</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Others
Publication year
2005
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Polymer Degradation and Stability
ISSN
0141-3910
e-ISSN
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Volume of the periodical
88
Issue of the periodical within the volume
1
Country of publishing house
GB - UNITED KINGDOM
Number of pages
8
Pages from-to
532-539
UT code for WoS article
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EID of the result in the Scopus database
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