Effect of in-situ formed core–shell inclusions on the mechanical properties and impact fracture of polypropylene

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26620%2F15%3APU115054" target="_blank" >RIV/00216305:26620/15:PU115054 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1016/j.eurpolymj.2015.07.057" target="_blank" >http://dx.doi.org/10.1016/j.eurpolymj.2015.07.057</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.eurpolymj.2015.07.057" target="_blank" >10.1016/j.eurpolymj.2015.07.057</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Effect of in-situ formed core–shell inclusions on the mechanical properties and impact fracture of polypropylene

Popis výsledku v původním jazyce

To obviate the reduction of stiffness in rubber toughened and yield strength in rigid particle toughened iPP, various strategies were adopted. Here, we report on the static and impact properties of isotactic polypropylene (iPP) with in situ formed (rigid thermotropic liquid crystalline core)-(soft copolymer shell) inclusions (RCSS inclusions). We found that, at constant soft shell thickness (t(s)) and stiffness (E-s), the elastic modulus of iPP/RCSS (E-c) increased with the total RCSS volume fraction (nu(RCSS)), and, at constant nu(RCSS), the E-c increased with E-s. At constant ts and Es, the yield strength of iPP/RCSS (sigma(yc)) decreased with the nu(RCSS) and, at constant nu(RCSS) and t(s), the sigma(yc) decreased with E-s in an agreement with the simple micromechanics models of Matonis and Small. At small nu(RCSS), the changes in E-c and sigma(yc) with nu(RCSS) contributed simultaneously to the significant enlargement of the crack tip plastic zone size, enhancing the impact fracture toughness in terms of the apparent critical strain energy release rate (G(c)'), substantially, without significantly reducing stiffness and yield strength. The SEM fractography revealed extension of the RCSS inclusions into fibrous shape providing an additional means for dissipation of mechanical energy stored in the fracturing solid. Experimental data agreed reasonably well with the prediction based on a simple mixed mode fracture model proposed earlier.

Název v anglickém jazyce

Effect of in-situ formed core–shell inclusions on the mechanical properties and impact fracture of polypropylene

Popis výsledku anglicky

To obviate the reduction of stiffness in rubber toughened and yield strength in rigid particle toughened iPP, various strategies were adopted. Here, we report on the static and impact properties of isotactic polypropylene (iPP) with in situ formed (rigid thermotropic liquid crystalline core)-(soft copolymer shell) inclusions (RCSS inclusions). We found that, at constant soft shell thickness (t(s)) and stiffness (E-s), the elastic modulus of iPP/RCSS (E-c) increased with the total RCSS volume fraction (nu(RCSS)), and, at constant nu(RCSS), the E-c increased with E-s. At constant ts and Es, the yield strength of iPP/RCSS (sigma(yc)) decreased with the nu(RCSS) and, at constant nu(RCSS) and t(s), the sigma(yc) decreased with E-s in an agreement with the simple micromechanics models of Matonis and Small. At small nu(RCSS), the changes in E-c and sigma(yc) with nu(RCSS) contributed simultaneously to the significant enlargement of the crack tip plastic zone size, enhancing the impact fracture toughness in terms of the apparent critical strain energy release rate (G(c)'), substantially, without significantly reducing stiffness and yield strength. The SEM fractography revealed extension of the RCSS inclusions into fibrous shape providing an additional means for dissipation of mechanical energy stored in the fracturing solid. Experimental data agreed reasonably well with the prediction based on a simple mixed mode fracture model proposed earlier.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

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OECD FORD obor

10404 - Polymer science

Projekt

<a href="/cs/project/GA15-18495S" target="_blank" >GA15-18495S: Mechanismy a kinetika samouspořádávání nanočástic v hierarchických polymerních kompozitech</a><br>

Návaznosti

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

Rok uplatnění

2015

Kód důvěrnosti údajů

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

Název periodika

European Polymer Journal

ISSN

0014-3057

e-ISSN

1873-1945

Svazek periodika

71

Číslo periodika v rámci svazku

7023

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

10

Strana od-do

221-230

Kód UT WoS článku

000362603800017

EID výsledku v databázi Scopus

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