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Tuning the Bulk and Surface Properties of PDMS Networks through Cross-Linker and Surfactant Concentration

[Image: see text] The elastic modulus and hydrophilicity of cross-linked poly(dimethylsiloxane) (PDMS) are tunable via cross-linker concentration and the addition of a simple surfactant, C(12)E(4), before curing. However, the surfactant concentration, [C(12)E(4)], reduces the elastic modulus (73% lo...

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Autores principales: Litwinowicz, Matthew, Rogers, Sarah, Caruana, Andrew, Kinane, Christy, Tellam, James, Thompson, Richard
Formato: Online Artículo Texto
Lenguaje:English
Publicado: American Chemical Society 2021
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8552438/
https://www.ncbi.nlm.nih.gov/pubmed/34720190
http://dx.doi.org/10.1021/acs.macromol.1c01600
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author Litwinowicz, Matthew
Rogers, Sarah
Caruana, Andrew
Kinane, Christy
Tellam, James
Thompson, Richard
author_facet Litwinowicz, Matthew
Rogers, Sarah
Caruana, Andrew
Kinane, Christy
Tellam, James
Thompson, Richard
author_sort Litwinowicz, Matthew
collection PubMed
description [Image: see text] The elastic modulus and hydrophilicity of cross-linked poly(dimethylsiloxane) (PDMS) are tunable via cross-linker concentration and the addition of a simple surfactant, C(12)E(4), before curing. However, the surfactant concentration, [C(12)E(4)], reduces the elastic modulus (73% lower for 6.3% w/w) because it reduces the extent of curing. This is likely because the hygroscopic surfactant results in water poisoning of the catalyst. Three distinct time-dependent hydrophilicity profiles were identified using water contact angle analysis with [C(12)E(4)] determining which profile was observed. This indicates the concentration-dependent phase behavior of C(12)E(4) within PDMS films. Changes in phase behavior were identified using small-angle neutron scattering (SANS) and a compatibility study. No surface excess or surface segregation of surfactant was observed at the PDMS–air interface. However, a surface excess revealed by neutron reflectivity against a D(2)O interface indicates that the increase in hydrophilicity results from the migration of C(12)E(4) to the film interface when exposed to water.
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spelling pubmed-85524382021-10-29 Tuning the Bulk and Surface Properties of PDMS Networks through Cross-Linker and Surfactant Concentration Litwinowicz, Matthew Rogers, Sarah Caruana, Andrew Kinane, Christy Tellam, James Thompson, Richard Macromolecules [Image: see text] The elastic modulus and hydrophilicity of cross-linked poly(dimethylsiloxane) (PDMS) are tunable via cross-linker concentration and the addition of a simple surfactant, C(12)E(4), before curing. However, the surfactant concentration, [C(12)E(4)], reduces the elastic modulus (73% lower for 6.3% w/w) because it reduces the extent of curing. This is likely because the hygroscopic surfactant results in water poisoning of the catalyst. Three distinct time-dependent hydrophilicity profiles were identified using water contact angle analysis with [C(12)E(4)] determining which profile was observed. This indicates the concentration-dependent phase behavior of C(12)E(4) within PDMS films. Changes in phase behavior were identified using small-angle neutron scattering (SANS) and a compatibility study. No surface excess or surface segregation of surfactant was observed at the PDMS–air interface. However, a surface excess revealed by neutron reflectivity against a D(2)O interface indicates that the increase in hydrophilicity results from the migration of C(12)E(4) to the film interface when exposed to water. American Chemical Society 2021-10-06 2021-10-26 /pmc/articles/PMC8552438/ /pubmed/34720190 http://dx.doi.org/10.1021/acs.macromol.1c01600 Text en © 2021 The Authors. Published by American Chemical Society https://creativecommons.org/licenses/by/4.0/Permits the broadest form of re-use including for commercial purposes, provided that author attribution and integrity are maintained (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Litwinowicz, Matthew
Rogers, Sarah
Caruana, Andrew
Kinane, Christy
Tellam, James
Thompson, Richard
Tuning the Bulk and Surface Properties of PDMS Networks through Cross-Linker and Surfactant Concentration
title Tuning the Bulk and Surface Properties of PDMS Networks through Cross-Linker and Surfactant Concentration
title_full Tuning the Bulk and Surface Properties of PDMS Networks through Cross-Linker and Surfactant Concentration
title_fullStr Tuning the Bulk and Surface Properties of PDMS Networks through Cross-Linker and Surfactant Concentration
title_full_unstemmed Tuning the Bulk and Surface Properties of PDMS Networks through Cross-Linker and Surfactant Concentration
title_short Tuning the Bulk and Surface Properties of PDMS Networks through Cross-Linker and Surfactant Concentration
title_sort tuning the bulk and surface properties of pdms networks through cross-linker and surfactant concentration
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8552438/
https://www.ncbi.nlm.nih.gov/pubmed/34720190
http://dx.doi.org/10.1021/acs.macromol.1c01600
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