Effect of polymer brushes grafted from graphene oxide on rheology of PMMA/SAN blends

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F70883521%3A28110%2F23%3A63571058" target="_blank" >RIV/70883521:28110/23:63571058 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/70883521:28610/23:63571058

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Effect of polymer brushes grafted from graphene oxide on rheology of PMMA/SAN blends

Popis výsledku v původním jazyce

The particle-polymer hybrids have been recognized as interesting materials for compatibilization of immiscible polymer blends. The particle core imparts the additional materials property while the polymer shell provides interactions with polymer matrix. This study is focused on rheological properties of such systems in both shear and elongation flow. In real technological processes both shear and elongational flow occurs simultaneously and form the morphology and final properties of the material. The rheological properties may differ under these types of flow. Therefore, here the effect of various length of polymer brushes grafted from particles on rheology of immiscible blends in elongation and shear was investigated. As a polymer matrix the blend of poly(methyl methacrylate)/styrene-co-acrylonitrile (PMMA/SAN) was used. The poly(methyl methacrylate) (PMMA) brushes grafted from graphene oxide (GO-g-PMMA) with various number average molar masses (Mn) of PMMA with respect to chain entanglement limit of freely dispersed PMMA were prepared. The extensional rheological properties of the PMMA/SAN were affected by Mn of PMMA brushes, while the rheological properties in shear were almost unchanged. Transmission electron microscopy revealed the compatibilization effect for short densely grafted brushes with Mn of 10,300 g/mol, as smaller SAN domains were observed. On the contrary the higher Mn PMMA brushes facilitated coalescence. With increasing length of brushes the elongational viscosity at low elongation rates ( ~ &lt; 0.1 s-1) decreased, that facilitated the coalescence. At higher elongation rates (~ &gt; 0.1 s-1) the viscosity increased that resulted in formation of elongated SAN domains.

Název v anglickém jazyce

Effect of polymer brushes grafted from graphene oxide on rheology of PMMA/SAN blends

Popis výsledku anglicky

The particle-polymer hybrids have been recognized as interesting materials for compatibilization of immiscible polymer blends. The particle core imparts the additional materials property while the polymer shell provides interactions with polymer matrix. This study is focused on rheological properties of such systems in both shear and elongation flow. In real technological processes both shear and elongational flow occurs simultaneously and form the morphology and final properties of the material. The rheological properties may differ under these types of flow. Therefore, here the effect of various length of polymer brushes grafted from particles on rheology of immiscible blends in elongation and shear was investigated. As a polymer matrix the blend of poly(methyl methacrylate)/styrene-co-acrylonitrile (PMMA/SAN) was used. The poly(methyl methacrylate) (PMMA) brushes grafted from graphene oxide (GO-g-PMMA) with various number average molar masses (Mn) of PMMA with respect to chain entanglement limit of freely dispersed PMMA were prepared. The extensional rheological properties of the PMMA/SAN were affected by Mn of PMMA brushes, while the rheological properties in shear were almost unchanged. Transmission electron microscopy revealed the compatibilization effect for short densely grafted brushes with Mn of 10,300 g/mol, as smaller SAN domains were observed. On the contrary the higher Mn PMMA brushes facilitated coalescence. With increasing length of brushes the elongational viscosity at low elongation rates ( ~ &lt; 0.1 s-1) decreased, that facilitated the coalescence. At higher elongation rates (~ &gt; 0.1 s-1) the viscosity increased that resulted in formation of elongated SAN domains.

Druh

O - Ostatní výsledky

CEP obor

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OECD FORD obor

10404 - Polymer science

Projekt

<a href="/cs/project/NU23-08-00243" target="_blank" >NU23-08-00243: Funkční náhrady pro regeneraci nervových tkání připravované pomocí pokročilých 3D tiskových technik</a><br>

Návaznosti

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

Rok uplatnění

2023

Kód důvěrnosti údajů

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