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Viscoelastic Rheological Behaviors of Polypropylene and LMPP Blends

Dynamic oscillatory shear testing is used to investigate polymeric viscoelastic behaviors. Small and large amplitude oscillatory shear tests are the canonical method for characterizing the linear and nonlinear viscoelastic behaviors of any polymeric material. With prominent and abundant work on line...

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Autores principales: Zhu, Feichao, Yasin, Sohail, Hussain, Munir
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8540593/
https://www.ncbi.nlm.nih.gov/pubmed/34685243
http://dx.doi.org/10.3390/polym13203485
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author Zhu, Feichao
Yasin, Sohail
Hussain, Munir
author_facet Zhu, Feichao
Yasin, Sohail
Hussain, Munir
author_sort Zhu, Feichao
collection PubMed
description Dynamic oscillatory shear testing is used to investigate polymeric viscoelastic behaviors. Small and large amplitude oscillatory shear tests are the canonical method for characterizing the linear and nonlinear viscoelastic behaviors of any polymeric material. With prominent and abundant work on linear viscoelastic studies, the nonlinear behavior is evasive in terms of generating infinite higher harmonics in the nonlinear regime. For this reason, intrinsic nonlinearities from large amplitude oscillatory shear (LAOS) studies have recently been used for insights on microstructural behaviors. This study is carried out for linear and nonlinear viscoelastic behavior with a main focus on LAOS of isostatic polypropylene (iPP) and relatively new low molecular weight and low modulus polypropylene-based polyolefin (LMPP) blends. The morphological results showed reduced spherulitic crystal nucleus size and increased distribution in blends with increasing LMPP. The blends showed subtle linear viscoelastic responses with strong nonlinear mechanical responses to variant strain and stress compared to pure iPP. The intracycle strain thickening and intracycle strain stiffening of high-content LMPP blends were comparatively dominant at medium strain amplitudes.
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spelling pubmed-85405932021-10-24 Viscoelastic Rheological Behaviors of Polypropylene and LMPP Blends Zhu, Feichao Yasin, Sohail Hussain, Munir Polymers (Basel) Article Dynamic oscillatory shear testing is used to investigate polymeric viscoelastic behaviors. Small and large amplitude oscillatory shear tests are the canonical method for characterizing the linear and nonlinear viscoelastic behaviors of any polymeric material. With prominent and abundant work on linear viscoelastic studies, the nonlinear behavior is evasive in terms of generating infinite higher harmonics in the nonlinear regime. For this reason, intrinsic nonlinearities from large amplitude oscillatory shear (LAOS) studies have recently been used for insights on microstructural behaviors. This study is carried out for linear and nonlinear viscoelastic behavior with a main focus on LAOS of isostatic polypropylene (iPP) and relatively new low molecular weight and low modulus polypropylene-based polyolefin (LMPP) blends. The morphological results showed reduced spherulitic crystal nucleus size and increased distribution in blends with increasing LMPP. The blends showed subtle linear viscoelastic responses with strong nonlinear mechanical responses to variant strain and stress compared to pure iPP. The intracycle strain thickening and intracycle strain stiffening of high-content LMPP blends were comparatively dominant at medium strain amplitudes. MDPI 2021-10-11 /pmc/articles/PMC8540593/ /pubmed/34685243 http://dx.doi.org/10.3390/polym13203485 Text en © 2021 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Zhu, Feichao
Yasin, Sohail
Hussain, Munir
Viscoelastic Rheological Behaviors of Polypropylene and LMPP Blends
title Viscoelastic Rheological Behaviors of Polypropylene and LMPP Blends
title_full Viscoelastic Rheological Behaviors of Polypropylene and LMPP Blends
title_fullStr Viscoelastic Rheological Behaviors of Polypropylene and LMPP Blends
title_full_unstemmed Viscoelastic Rheological Behaviors of Polypropylene and LMPP Blends
title_short Viscoelastic Rheological Behaviors of Polypropylene and LMPP Blends
title_sort viscoelastic rheological behaviors of polypropylene and lmpp blends
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8540593/
https://www.ncbi.nlm.nih.gov/pubmed/34685243
http://dx.doi.org/10.3390/polym13203485
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