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

Kód výsledku v 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>

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Structure evolution of alfa- And betha-polypropylenes upon UV irradiation: A multiscale comparison

Popis výsledku v původním jazyce

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

Název v anglickém jazyce

Structure evolution of alfa- And betha-polypropylenes upon UV irradiation: A multiscale comparison

Popis výsledku anglicky

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

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

CD - Makromolekulární chemie

OECD FORD obor

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Projekt

<a href="/cs/project/ME%20647" target="_blank" >ME 647: Struktura a morfologie polymerů</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2005

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Polymer Degradation and Stability

ISSN

0141-3910

e-ISSN

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Svazek periodika

88

Číslo periodika v rámci svazku

1

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

8

Strana od-do

532-539

Kód UT WoS článku

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EID výsledku v databázi Scopus

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