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Effects of chain extender on properties and foaming behavior of polypropylene foam

Polypropylene (PP) foam offers superior thermal and mechanical properties and versatile applications. However, the linear structure of PP hinders the fabrication of a uniform and fine foam, owing to changes in the melt strength with variations in the temperature. The foamability of the material can...

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Detalles Bibliográficos
Autores principales: Kim, Do Young, Cha, Ji Hun, Seo, Kwan Ho
Formato: Online Artículo Texto
Lenguaje:English
Publicado: The Royal Society of Chemistry 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9070091/
https://www.ncbi.nlm.nih.gov/pubmed/35530111
http://dx.doi.org/10.1039/c9ra04824c
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author Kim, Do Young
Cha, Ji Hun
Seo, Kwan Ho
author_facet Kim, Do Young
Cha, Ji Hun
Seo, Kwan Ho
author_sort Kim, Do Young
collection PubMed
description Polypropylene (PP) foam offers superior thermal and mechanical properties and versatile applications. However, the linear structure of PP hinders the fabrication of a uniform and fine foam, owing to changes in the melt strength with variations in the temperature. The foamability of the material can be improved by fabricating modified PP by introducing long-chain branches by grafting and chain extension reactions, using glycidyl methacrylate (GMA) and adipic acid (AA). Adding 5 phr GMA to PP optimizes the graft ratio. AA as a chain extender forms a long-chain branched structure, as confirmed by the melt flow index, morphology, and thermal and dynamic viscoelastic properties. Variations in foaming characteristics according to the AA content, temperature, volume expansion ratio, and oven residence time have also been observed. An optimal volume expansion ratio of ∼14 is obtained at an AA content of 1.5 phr and foaming for 11 min at 240 °C.
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spelling pubmed-90700912022-05-05 Effects of chain extender on properties and foaming behavior of polypropylene foam Kim, Do Young Cha, Ji Hun Seo, Kwan Ho RSC Adv Chemistry Polypropylene (PP) foam offers superior thermal and mechanical properties and versatile applications. However, the linear structure of PP hinders the fabrication of a uniform and fine foam, owing to changes in the melt strength with variations in the temperature. The foamability of the material can be improved by fabricating modified PP by introducing long-chain branches by grafting and chain extension reactions, using glycidyl methacrylate (GMA) and adipic acid (AA). Adding 5 phr GMA to PP optimizes the graft ratio. AA as a chain extender forms a long-chain branched structure, as confirmed by the melt flow index, morphology, and thermal and dynamic viscoelastic properties. Variations in foaming characteristics according to the AA content, temperature, volume expansion ratio, and oven residence time have also been observed. An optimal volume expansion ratio of ∼14 is obtained at an AA content of 1.5 phr and foaming for 11 min at 240 °C. The Royal Society of Chemistry 2019-08-15 /pmc/articles/PMC9070091/ /pubmed/35530111 http://dx.doi.org/10.1039/c9ra04824c Text en This journal is © The Royal Society of Chemistry https://creativecommons.org/licenses/by-nc/3.0/
spellingShingle Chemistry
Kim, Do Young
Cha, Ji Hun
Seo, Kwan Ho
Effects of chain extender on properties and foaming behavior of polypropylene foam
title Effects of chain extender on properties and foaming behavior of polypropylene foam
title_full Effects of chain extender on properties and foaming behavior of polypropylene foam
title_fullStr Effects of chain extender on properties and foaming behavior of polypropylene foam
title_full_unstemmed Effects of chain extender on properties and foaming behavior of polypropylene foam
title_short Effects of chain extender on properties and foaming behavior of polypropylene foam
title_sort effects of chain extender on properties and foaming behavior of polypropylene foam
topic Chemistry
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9070091/
https://www.ncbi.nlm.nih.gov/pubmed/35530111
http://dx.doi.org/10.1039/c9ra04824c
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