Cargando…
Small and Medium Amplitude Oscillatory Shear Rheology of Model Branched Polystyrene (PS) Melts
Linear and nonlinear rheological properties of model comb polystyrenes (PS) with loosely to densely grafted architectures were measured under small and medium amplitude oscillatory shear (SAOS and MAOS) flow. This comb PS set had the same length of backbone and branches but varied in the number of b...
Autores principales: | , , , , , , , |
---|---|
Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2020
|
Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7077396/ https://www.ncbi.nlm.nih.gov/pubmed/32046003 http://dx.doi.org/10.3390/polym12020365 |
_version_ | 1783507422771412992 |
---|---|
author | Song, Hyeong Yong Faust, Lorenz Son, Jinha Kim, Mingeun Park, Seung Joon Ahn, Suk-kyun Wilhelm, Manfred Hyun, Kyu |
author_facet | Song, Hyeong Yong Faust, Lorenz Son, Jinha Kim, Mingeun Park, Seung Joon Ahn, Suk-kyun Wilhelm, Manfred Hyun, Kyu |
author_sort | Song, Hyeong Yong |
collection | PubMed |
description | Linear and nonlinear rheological properties of model comb polystyrenes (PS) with loosely to densely grafted architectures were measured under small and medium amplitude oscillatory shear (SAOS and MAOS) flow. This comb PS set had the same length of backbone and branches but varied in the number of branches from 3 to 120 branches. Linear viscoelastic properties of the comb PS were compared with the hierarchical model predictions. The model underpredicted zero-shear viscosity and backbone plateau modulus of densely branched comb with 60 or 120 branches because the model does not include the effect of side chain crowding. First- and third-harmonic nonlinearities reflected the hierarchy in the relaxation motion of comb structures. Notably, the low-frequency plateau values of first-harmonic MAOS moduli scaled with [Formula: see text] (total molecular weight), reflecting dynamic tube dilution (DTD) by relaxed branches. Relative intrinsic nonlinearity Q(0) exhibited the difference between comb and bottlebrush via no low-frequency Q(0) peak of bottlebrush corresponding to backbone relaxation, which is probably related to the stretched backbone conformation in bottlebrush. |
format | Online Article Text |
id | pubmed-7077396 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2020 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-70773962020-03-20 Small and Medium Amplitude Oscillatory Shear Rheology of Model Branched Polystyrene (PS) Melts Song, Hyeong Yong Faust, Lorenz Son, Jinha Kim, Mingeun Park, Seung Joon Ahn, Suk-kyun Wilhelm, Manfred Hyun, Kyu Polymers (Basel) Article Linear and nonlinear rheological properties of model comb polystyrenes (PS) with loosely to densely grafted architectures were measured under small and medium amplitude oscillatory shear (SAOS and MAOS) flow. This comb PS set had the same length of backbone and branches but varied in the number of branches from 3 to 120 branches. Linear viscoelastic properties of the comb PS were compared with the hierarchical model predictions. The model underpredicted zero-shear viscosity and backbone plateau modulus of densely branched comb with 60 or 120 branches because the model does not include the effect of side chain crowding. First- and third-harmonic nonlinearities reflected the hierarchy in the relaxation motion of comb structures. Notably, the low-frequency plateau values of first-harmonic MAOS moduli scaled with [Formula: see text] (total molecular weight), reflecting dynamic tube dilution (DTD) by relaxed branches. Relative intrinsic nonlinearity Q(0) exhibited the difference between comb and bottlebrush via no low-frequency Q(0) peak of bottlebrush corresponding to backbone relaxation, which is probably related to the stretched backbone conformation in bottlebrush. MDPI 2020-02-07 /pmc/articles/PMC7077396/ /pubmed/32046003 http://dx.doi.org/10.3390/polym12020365 Text en © 2020 by the authors. 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 (http://creativecommons.org/licenses/by/4.0/). |
spellingShingle | Article Song, Hyeong Yong Faust, Lorenz Son, Jinha Kim, Mingeun Park, Seung Joon Ahn, Suk-kyun Wilhelm, Manfred Hyun, Kyu Small and Medium Amplitude Oscillatory Shear Rheology of Model Branched Polystyrene (PS) Melts |
title | Small and Medium Amplitude Oscillatory Shear Rheology of Model Branched Polystyrene (PS) Melts |
title_full | Small and Medium Amplitude Oscillatory Shear Rheology of Model Branched Polystyrene (PS) Melts |
title_fullStr | Small and Medium Amplitude Oscillatory Shear Rheology of Model Branched Polystyrene (PS) Melts |
title_full_unstemmed | Small and Medium Amplitude Oscillatory Shear Rheology of Model Branched Polystyrene (PS) Melts |
title_short | Small and Medium Amplitude Oscillatory Shear Rheology of Model Branched Polystyrene (PS) Melts |
title_sort | small and medium amplitude oscillatory shear rheology of model branched polystyrene (ps) melts |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7077396/ https://www.ncbi.nlm.nih.gov/pubmed/32046003 http://dx.doi.org/10.3390/polym12020365 |
work_keys_str_mv | AT songhyeongyong smallandmediumamplitudeoscillatoryshearrheologyofmodelbranchedpolystyrenepsmelts AT faustlorenz smallandmediumamplitudeoscillatoryshearrheologyofmodelbranchedpolystyrenepsmelts AT sonjinha smallandmediumamplitudeoscillatoryshearrheologyofmodelbranchedpolystyrenepsmelts AT kimmingeun smallandmediumamplitudeoscillatoryshearrheologyofmodelbranchedpolystyrenepsmelts AT parkseungjoon smallandmediumamplitudeoscillatoryshearrheologyofmodelbranchedpolystyrenepsmelts AT ahnsukkyun smallandmediumamplitudeoscillatoryshearrheologyofmodelbranchedpolystyrenepsmelts AT wilhelmmanfred smallandmediumamplitudeoscillatoryshearrheologyofmodelbranchedpolystyrenepsmelts AT hyunkyu smallandmediumamplitudeoscillatoryshearrheologyofmodelbranchedpolystyrenepsmelts |