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Modulation of Surface-Initiated ATRP by Confinement: Mechanism and Applications
[Image: see text] The mechanism of surface-initiated atom transfer polymerization (SI-ATRP) of methacrylates in confined volumes is systematically investigated by finely tuning the distance between a grafting surface and an inert plane by means of nanosized patterns and micrometer thick foils. The p...
Autores principales: | , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
American Chemical Society
2017
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Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5940320/ https://www.ncbi.nlm.nih.gov/pubmed/29755138 http://dx.doi.org/10.1021/acs.macromol.7b00919 |
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author | Benetti, Edmondo M. Kang, Chengjun Mandal, Joydeb Divandari, Mohammad Spencer, Nicholas D. |
author_facet | Benetti, Edmondo M. Kang, Chengjun Mandal, Joydeb Divandari, Mohammad Spencer, Nicholas D. |
author_sort | Benetti, Edmondo M. |
collection | PubMed |
description | [Image: see text] The mechanism of surface-initiated atom transfer polymerization (SI-ATRP) of methacrylates in confined volumes is systematically investigated by finely tuning the distance between a grafting surface and an inert plane by means of nanosized patterns and micrometer thick foils. The polymers were synthesized from monolayers of photocleavable initiators, which allow the analysis of detached brushes by size-exclusion chromatography (SEC). Compared to brushes synthesized under “open” polymerization mixtures, nearly a 4-fold increase in brush molar mass was recorded when SI-ATRP was performed within highly confined reaction volumes. Correlating the SI-ATRP of methyl methacrylate (MMA), with and without “sacrificial” initiator, to that of lauryl methacrylate (LMA) and analyzing the brush growth rates within differently confined volumes, we demonstrate faster grafting kinetics with increasing confinement due to the progressive hindering of Cu(II)-based deactivators from the brush propagating front. This effect is especially noticeable when viscous polymerization mixtures are generated and enables the synthesis of several hundred nanometer thick brushes within relatively short polymerization times. The faster rates of confined SI-ATRP can be additionally used to fabricate, in one pot, precisely structured brush gradients, when volume confinement is continuously varied across a single substrate by spatially tuning the vertical distance between the grafting and the confining surfaces. |
format | Online Article Text |
id | pubmed-5940320 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2017 |
publisher | American Chemical Society |
record_format | MEDLINE/PubMed |
spelling | pubmed-59403202018-05-09 Modulation of Surface-Initiated ATRP by Confinement: Mechanism and Applications Benetti, Edmondo M. Kang, Chengjun Mandal, Joydeb Divandari, Mohammad Spencer, Nicholas D. Macromolecules [Image: see text] The mechanism of surface-initiated atom transfer polymerization (SI-ATRP) of methacrylates in confined volumes is systematically investigated by finely tuning the distance between a grafting surface and an inert plane by means of nanosized patterns and micrometer thick foils. The polymers were synthesized from monolayers of photocleavable initiators, which allow the analysis of detached brushes by size-exclusion chromatography (SEC). Compared to brushes synthesized under “open” polymerization mixtures, nearly a 4-fold increase in brush molar mass was recorded when SI-ATRP was performed within highly confined reaction volumes. Correlating the SI-ATRP of methyl methacrylate (MMA), with and without “sacrificial” initiator, to that of lauryl methacrylate (LMA) and analyzing the brush growth rates within differently confined volumes, we demonstrate faster grafting kinetics with increasing confinement due to the progressive hindering of Cu(II)-based deactivators from the brush propagating front. This effect is especially noticeable when viscous polymerization mixtures are generated and enables the synthesis of several hundred nanometer thick brushes within relatively short polymerization times. The faster rates of confined SI-ATRP can be additionally used to fabricate, in one pot, precisely structured brush gradients, when volume confinement is continuously varied across a single substrate by spatially tuning the vertical distance between the grafting and the confining surfaces. American Chemical Society 2017-07-19 2017-08-08 /pmc/articles/PMC5940320/ /pubmed/29755138 http://dx.doi.org/10.1021/acs.macromol.7b00919 Text en Copyright © 2017 American Chemical Society This is an open access article published under an ACS AuthorChoice License (http://pubs.acs.org/page/policy/authorchoice_termsofuse.html) , which permits copying and redistribution of the article or any adaptations for non-commercial purposes. |
spellingShingle | Benetti, Edmondo M. Kang, Chengjun Mandal, Joydeb Divandari, Mohammad Spencer, Nicholas D. Modulation of Surface-Initiated ATRP by Confinement: Mechanism and Applications |
title | Modulation of Surface-Initiated ATRP by Confinement:
Mechanism and Applications |
title_full | Modulation of Surface-Initiated ATRP by Confinement:
Mechanism and Applications |
title_fullStr | Modulation of Surface-Initiated ATRP by Confinement:
Mechanism and Applications |
title_full_unstemmed | Modulation of Surface-Initiated ATRP by Confinement:
Mechanism and Applications |
title_short | Modulation of Surface-Initiated ATRP by Confinement:
Mechanism and Applications |
title_sort | modulation of surface-initiated atrp by confinement:
mechanism and applications |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5940320/ https://www.ncbi.nlm.nih.gov/pubmed/29755138 http://dx.doi.org/10.1021/acs.macromol.7b00919 |
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