Controlling the structure and density of PMMA bimodal nanocellular foam by blending different molecular weights

The bimodal cellular structure of foam is known to provide unique physical properties. In addition, it may help reduce foam density. This study proposes a simple method of creating a bimodal microcellular/nanocellular structure by blending PMMAs of different molecular weights using CO2 as the blowin...

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Autores principales:	Shu-Kai Yeh, Nigus Maregu Demewoz, Vania Kurniawan
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2021
Materias:	Nanofoam PMMA blends Viscoelastic properties CO2 solid-state foaming Bimodal foam Polymers and polymer manufacture TP1080-1185
Acceso en línea:	https://doaj.org/article/05d961bb578e4d41b23607a090958568
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spelling	oai:doaj.org-article:05d961bb578e4d41b23607a0909585682021-11-24T04:26:03ZControlling the structure and density of PMMA bimodal nanocellular foam by blending different molecular weights0142-941810.1016/j.polymertesting.2020.107004https://doaj.org/article/05d961bb578e4d41b23607a0909585682021-01-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S0142941820322339https://doaj.org/toc/0142-9418The bimodal cellular structure of foam is known to provide unique physical properties. In addition, it may help reduce foam density. This study proposes a simple method of creating a bimodal microcellular/nanocellular structure by blending PMMAs of different molecular weights using CO2 as the blowing agent. Nanofoam, with its low relative density, is the right candidate for thermal insulation, but obtaining it is challenging. Introducing micron-sized bubbles into homogeneous nanocellular structures may be one way to reduce the foam density and potentially not affect some of the properties. Beyond the bimodal structure, a transition from an ultramicrocellular to a nanocellular structure and from a closed-cell to an open-cell structure was observed. These transitions may be related to the relaxation time and weight percentage of non-entangled PMMA content. Formation of the bimodal nanocellular or open-cell structure may be predicted by the viscoelastic properties such as the relaxation time.Shu-Kai YehNigus Maregu DemewozVania KurniawanElsevierarticleNanofoamPMMA blendsViscoelastic propertiesCO2 solid-state foamingBimodal foamPolymers and polymer manufactureTP1080-1185ENPolymer Testing, Vol 93, Iss , Pp 107004- (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Nanofoam PMMA blends Viscoelastic properties CO2 solid-state foaming Bimodal foam Polymers and polymer manufacture TP1080-1185
spellingShingle	Nanofoam PMMA blends Viscoelastic properties CO2 solid-state foaming Bimodal foam Polymers and polymer manufacture TP1080-1185 Shu-Kai Yeh Nigus Maregu Demewoz Vania Kurniawan Controlling the structure and density of PMMA bimodal nanocellular foam by blending different molecular weights
description	The bimodal cellular structure of foam is known to provide unique physical properties. In addition, it may help reduce foam density. This study proposes a simple method of creating a bimodal microcellular/nanocellular structure by blending PMMAs of different molecular weights using CO2 as the blowing agent. Nanofoam, with its low relative density, is the right candidate for thermal insulation, but obtaining it is challenging. Introducing micron-sized bubbles into homogeneous nanocellular structures may be one way to reduce the foam density and potentially not affect some of the properties. Beyond the bimodal structure, a transition from an ultramicrocellular to a nanocellular structure and from a closed-cell to an open-cell structure was observed. These transitions may be related to the relaxation time and weight percentage of non-entangled PMMA content. Formation of the bimodal nanocellular or open-cell structure may be predicted by the viscoelastic properties such as the relaxation time.
format	article
author	Shu-Kai Yeh Nigus Maregu Demewoz Vania Kurniawan
author_facet	Shu-Kai Yeh Nigus Maregu Demewoz Vania Kurniawan
author_sort	Shu-Kai Yeh
title	Controlling the structure and density of PMMA bimodal nanocellular foam by blending different molecular weights
title_short	Controlling the structure and density of PMMA bimodal nanocellular foam by blending different molecular weights
title_full	Controlling the structure and density of PMMA bimodal nanocellular foam by blending different molecular weights
title_fullStr	Controlling the structure and density of PMMA bimodal nanocellular foam by blending different molecular weights
title_full_unstemmed	Controlling the structure and density of PMMA bimodal nanocellular foam by blending different molecular weights
title_sort	controlling the structure and density of pmma bimodal nanocellular foam by blending different molecular weights
publisher	Elsevier
publishDate	2021
url	https://doaj.org/article/05d961bb578e4d41b23607a090958568
work_keys_str_mv	AT shukaiyeh controllingthestructureanddensityofpmmabimodalnanocellularfoambyblendingdifferentmolecularweights AT nigusmaregudemewoz controllingthestructureanddensityofpmmabimodalnanocellularfoambyblendingdifferentmolecularweights AT vaniakurniawan controllingthestructureanddensityofpmmabimodalnanocellularfoambyblendingdifferentmolecularweights
_version_	1718415956475117568

Controlling the structure and density of PMMA bimodal nanocellular foam by blending different molecular weights

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