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The Scissors Effect in Action: The Fox-Flory Relationship between the Glass Transition Temperature of Crosslinked Poly(Methyl Methacrylate) and Mc in Nanophase Separated Poly(Methyl Methacrylate)-l-Polyisobutylene Conetworks

The glass transition temperature (T(g)) is one of the most important properties of polymeric materials. In order to reveal whether the scissors effect, i.e., the Fox–Flory relationship between T(g) and the average molecular weight between crosslinking points (M(c)), reported only in one case for pol...

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Autores principales: Pásztor, Szabolcs, Becsei, Bálint, Szarka, Györgyi, Thomann, Yi, Thomann, Ralf, Mühlhaupt, Rolf, Iván, Béla
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7663353/
https://www.ncbi.nlm.nih.gov/pubmed/33126719
http://dx.doi.org/10.3390/ma13214822
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author Pásztor, Szabolcs
Becsei, Bálint
Szarka, Györgyi
Thomann, Yi
Thomann, Ralf
Mühlhaupt, Rolf
Iván, Béla
author_facet Pásztor, Szabolcs
Becsei, Bálint
Szarka, Györgyi
Thomann, Yi
Thomann, Ralf
Mühlhaupt, Rolf
Iván, Béla
author_sort Pásztor, Szabolcs
collection PubMed
description The glass transition temperature (T(g)) is one of the most important properties of polymeric materials. In order to reveal whether the scissors effect, i.e., the Fox–Flory relationship between T(g) and the average molecular weight between crosslinking points (M(c)), reported only in one case for polymer conetworks so far, is more generally effective or valid only for a single case, a series of poly(methyl methacrylate)-l-polyisobutylene (PMMA-l-PIB) conetworks was prepared and investigated. Two T(g)s were found for the conetworks by DSC. Fox–Flory type dependence between T(g) and M(c) of the PMMA component (T(g) = T(g,∞) − K/M(c)) was observed. The K constants for the PMMA homopolymer and for the PMMA in the conetworks were the same in the margin of error. AFM images indicated disordered bicontinuous, mutually nanoconfined morphology with average domain sizes of 5–20 nm, but the correlation between T(g) and domain sizes was not found. These new results indicate that the macrocrosslinkers act like molecular scissors (scissors effect), and the T(g) of PMMA depend exclusively on the M(c) in the conetworks. Consequently, these findings mean that the scissors effect is presumably a general phenomenon in nanophase-separated polymer conetworks, and this finding could be utilized in designing, processing, and applications of these novel materials.
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spelling pubmed-76633532020-11-14 The Scissors Effect in Action: The Fox-Flory Relationship between the Glass Transition Temperature of Crosslinked Poly(Methyl Methacrylate) and Mc in Nanophase Separated Poly(Methyl Methacrylate)-l-Polyisobutylene Conetworks Pásztor, Szabolcs Becsei, Bálint Szarka, Györgyi Thomann, Yi Thomann, Ralf Mühlhaupt, Rolf Iván, Béla Materials (Basel) Article The glass transition temperature (T(g)) is one of the most important properties of polymeric materials. In order to reveal whether the scissors effect, i.e., the Fox–Flory relationship between T(g) and the average molecular weight between crosslinking points (M(c)), reported only in one case for polymer conetworks so far, is more generally effective or valid only for a single case, a series of poly(methyl methacrylate)-l-polyisobutylene (PMMA-l-PIB) conetworks was prepared and investigated. Two T(g)s were found for the conetworks by DSC. Fox–Flory type dependence between T(g) and M(c) of the PMMA component (T(g) = T(g,∞) − K/M(c)) was observed. The K constants for the PMMA homopolymer and for the PMMA in the conetworks were the same in the margin of error. AFM images indicated disordered bicontinuous, mutually nanoconfined morphology with average domain sizes of 5–20 nm, but the correlation between T(g) and domain sizes was not found. These new results indicate that the macrocrosslinkers act like molecular scissors (scissors effect), and the T(g) of PMMA depend exclusively on the M(c) in the conetworks. Consequently, these findings mean that the scissors effect is presumably a general phenomenon in nanophase-separated polymer conetworks, and this finding could be utilized in designing, processing, and applications of these novel materials. MDPI 2020-10-28 /pmc/articles/PMC7663353/ /pubmed/33126719 http://dx.doi.org/10.3390/ma13214822 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
Pásztor, Szabolcs
Becsei, Bálint
Szarka, Györgyi
Thomann, Yi
Thomann, Ralf
Mühlhaupt, Rolf
Iván, Béla
The Scissors Effect in Action: The Fox-Flory Relationship between the Glass Transition Temperature of Crosslinked Poly(Methyl Methacrylate) and Mc in Nanophase Separated Poly(Methyl Methacrylate)-l-Polyisobutylene Conetworks
title The Scissors Effect in Action: The Fox-Flory Relationship between the Glass Transition Temperature of Crosslinked Poly(Methyl Methacrylate) and Mc in Nanophase Separated Poly(Methyl Methacrylate)-l-Polyisobutylene Conetworks
title_full The Scissors Effect in Action: The Fox-Flory Relationship between the Glass Transition Temperature of Crosslinked Poly(Methyl Methacrylate) and Mc in Nanophase Separated Poly(Methyl Methacrylate)-l-Polyisobutylene Conetworks
title_fullStr The Scissors Effect in Action: The Fox-Flory Relationship between the Glass Transition Temperature of Crosslinked Poly(Methyl Methacrylate) and Mc in Nanophase Separated Poly(Methyl Methacrylate)-l-Polyisobutylene Conetworks
title_full_unstemmed The Scissors Effect in Action: The Fox-Flory Relationship between the Glass Transition Temperature of Crosslinked Poly(Methyl Methacrylate) and Mc in Nanophase Separated Poly(Methyl Methacrylate)-l-Polyisobutylene Conetworks
title_short The Scissors Effect in Action: The Fox-Flory Relationship between the Glass Transition Temperature of Crosslinked Poly(Methyl Methacrylate) and Mc in Nanophase Separated Poly(Methyl Methacrylate)-l-Polyisobutylene Conetworks
title_sort scissors effect in action: the fox-flory relationship between the glass transition temperature of crosslinked poly(methyl methacrylate) and mc in nanophase separated poly(methyl methacrylate)-l-polyisobutylene conetworks
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7663353/
https://www.ncbi.nlm.nih.gov/pubmed/33126719
http://dx.doi.org/10.3390/ma13214822
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