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Self-Restructuring of Polyhydromethylsiloxanes by the Hydride Transfer Process: A New Approach to the Cross-Linking of Polysiloxanes and to the Fabrication of Thin Polysiloxane Coatings
The branching and cross-linking of siloxane polymers are important processes in silicone technology. A new type of such a process has been developed, which is a self-restructuring of linear polyhydromethylsiloxane (PHMS). This process involves the reorganization of the PHMS to form a highly branched...
Autores principales: | , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2022
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9570814/ https://www.ncbi.nlm.nih.gov/pubmed/36234320 http://dx.doi.org/10.3390/ma15196981 |
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author | Mizerska, Urszula Rubinsztajn, Slawomir Chojnowski, Julian Cypryk, Marek Uznanski, Pawel Walkiewicz-Pietrzykowska, Agnieszka Fortuniak, Witold |
author_facet | Mizerska, Urszula Rubinsztajn, Slawomir Chojnowski, Julian Cypryk, Marek Uznanski, Pawel Walkiewicz-Pietrzykowska, Agnieszka Fortuniak, Witold |
author_sort | Mizerska, Urszula |
collection | PubMed |
description | The branching and cross-linking of siloxane polymers are important processes in silicone technology. A new type of such a process has been developed, which is a self-restructuring of linear polyhydromethylsiloxane (PHMS). This process involves the reorganization of the PHMS to form a highly branched siloxane polymer or finally a cross-linked siloxane network. It occurs through the transfer of a hydride ion between silicon atoms catalyzed by tris(pentafluoromethyl)borane. Its advantage over existing branching and cross-linking reactions is that it runs at room temperature without a low-molecular-weight cross-linker in the absence of water, silanol groups, or other protic compounds and it does not use metal catalysts. The study of this process was carried out in toluene solution. Its course was followed by (1)H NMR, (29)Si NMR and FTIR, SEC, and gas chromatography. A general mechanism of this new self-restructuring process supported by quantum calculations is proposed. It has been shown that a linear PHMS self-restructured to a highly branched polymer can serve as a pure methylsiloxane film precursor. |
format | Online Article Text |
id | pubmed-9570814 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2022 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-95708142022-10-17 Self-Restructuring of Polyhydromethylsiloxanes by the Hydride Transfer Process: A New Approach to the Cross-Linking of Polysiloxanes and to the Fabrication of Thin Polysiloxane Coatings Mizerska, Urszula Rubinsztajn, Slawomir Chojnowski, Julian Cypryk, Marek Uznanski, Pawel Walkiewicz-Pietrzykowska, Agnieszka Fortuniak, Witold Materials (Basel) Article The branching and cross-linking of siloxane polymers are important processes in silicone technology. A new type of such a process has been developed, which is a self-restructuring of linear polyhydromethylsiloxane (PHMS). This process involves the reorganization of the PHMS to form a highly branched siloxane polymer or finally a cross-linked siloxane network. It occurs through the transfer of a hydride ion between silicon atoms catalyzed by tris(pentafluoromethyl)borane. Its advantage over existing branching and cross-linking reactions is that it runs at room temperature without a low-molecular-weight cross-linker in the absence of water, silanol groups, or other protic compounds and it does not use metal catalysts. The study of this process was carried out in toluene solution. Its course was followed by (1)H NMR, (29)Si NMR and FTIR, SEC, and gas chromatography. A general mechanism of this new self-restructuring process supported by quantum calculations is proposed. It has been shown that a linear PHMS self-restructured to a highly branched polymer can serve as a pure methylsiloxane film precursor. MDPI 2022-10-08 /pmc/articles/PMC9570814/ /pubmed/36234320 http://dx.doi.org/10.3390/ma15196981 Text en © 2022 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 Mizerska, Urszula Rubinsztajn, Slawomir Chojnowski, Julian Cypryk, Marek Uznanski, Pawel Walkiewicz-Pietrzykowska, Agnieszka Fortuniak, Witold Self-Restructuring of Polyhydromethylsiloxanes by the Hydride Transfer Process: A New Approach to the Cross-Linking of Polysiloxanes and to the Fabrication of Thin Polysiloxane Coatings |
title | Self-Restructuring of Polyhydromethylsiloxanes by the Hydride Transfer Process: A New Approach to the Cross-Linking of Polysiloxanes and to the Fabrication of Thin Polysiloxane Coatings |
title_full | Self-Restructuring of Polyhydromethylsiloxanes by the Hydride Transfer Process: A New Approach to the Cross-Linking of Polysiloxanes and to the Fabrication of Thin Polysiloxane Coatings |
title_fullStr | Self-Restructuring of Polyhydromethylsiloxanes by the Hydride Transfer Process: A New Approach to the Cross-Linking of Polysiloxanes and to the Fabrication of Thin Polysiloxane Coatings |
title_full_unstemmed | Self-Restructuring of Polyhydromethylsiloxanes by the Hydride Transfer Process: A New Approach to the Cross-Linking of Polysiloxanes and to the Fabrication of Thin Polysiloxane Coatings |
title_short | Self-Restructuring of Polyhydromethylsiloxanes by the Hydride Transfer Process: A New Approach to the Cross-Linking of Polysiloxanes and to the Fabrication of Thin Polysiloxane Coatings |
title_sort | self-restructuring of polyhydromethylsiloxanes by the hydride transfer process: a new approach to the cross-linking of polysiloxanes and to the fabrication of thin polysiloxane coatings |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9570814/ https://www.ncbi.nlm.nih.gov/pubmed/36234320 http://dx.doi.org/10.3390/ma15196981 |
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