Joint Effects of Molecular Structure and Processing History on Specific Nucleation of Isotactic Polypropylene

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F70883521%3A28110%2F09%3A63508234" target="_blank" >RIV/70883521:28110/09:63508234 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/61389013:_____/09:00330320

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Joint Effects of Molecular Structure and Processing History on Specific Nucleation of Isotactic Polypropylene

Popis výsledku v původním jazyce

The interrelation between specific ?-nucleation, thermal history, and molecular weight of isotactic polypropylene (PP) has been investigated by wide-angle X-ray scattering, differential scanning calorimetry, and scanning electron microscopy. Samples witha broad range of molecular weight (Mw), from 240 000 to 1 300 000, allowed to examine the effect of PP molecular structure on the nucleation sensitivity. N,N`-Dicyclohexylnaphthalene-2,6-dicarboxamide (NU 100) was introduced in the concentrations of 0,0.01, and 0.03 wt % as a ?-specific nucleating agent into neat PP. Specimens were then processed via compression molding at various processing temperatures and times. Samples containing 0.01 wt % of NU 100 showed a dramatic decrease of nucleation activity into ?-phase with increasing Mw, processing time, and temperature. This effect was ascribed to a partial solubility of nucleator in PP melt and a competition between heterogeneous ?-nucleation and self ?-nucleation.

Název v anglickém jazyce

Joint Effects of Molecular Structure and Processing History on Specific Nucleation of Isotactic Polypropylene

Popis výsledku anglicky

The interrelation between specific ?-nucleation, thermal history, and molecular weight of isotactic polypropylene (PP) has been investigated by wide-angle X-ray scattering, differential scanning calorimetry, and scanning electron microscopy. Samples witha broad range of molecular weight (Mw), from 240 000 to 1 300 000, allowed to examine the effect of PP molecular structure on the nucleation sensitivity. N,N`-Dicyclohexylnaphthalene-2,6-dicarboxamide (NU 100) was introduced in the concentrations of 0,0.01, and 0.03 wt % as a ?-specific nucleating agent into neat PP. Specimens were then processed via compression molding at various processing temperatures and times. Samples containing 0.01 wt % of NU 100 showed a dramatic decrease of nucleation activity into ?-phase with increasing Mw, processing time, and temperature. This effect was ascribed to a partial solubility of nucleator in PP melt and a competition between heterogeneous ?-nucleation and self ?-nucleation.

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/GP106%2F07%2FP262" target="_blank" >GP106/07/P262: Mikrofibrilární polymer-polymer kompozity připravované in-situ</a><br>

Návaznosti

Z - Vyzkumny zamer (s odkazem do CEZ)

Rok uplatnění

2009

Kód důvěrnosti údajů

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

Název periodika

Macromolecules

ISSN

0024-9297

e-ISSN

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Svazek periodika

19

Číslo periodika v rámci svazku

42

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

5

Strana od-do

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Kód UT WoS článku

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EID výsledku v databázi Scopus

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