Cargando…

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...

Descripción completa

Detalles Bibliográficos
Autores principales: Mizerska, Urszula, Rubinsztajn, Slawomir, Chojnowski, Julian, Cypryk, Marek, Uznanski, Pawel, Walkiewicz-Pietrzykowska, Agnieszka, Fortuniak, Witold
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2022
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
_version_ 1784810204333867008
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
work_keys_str_mv AT mizerskaurszula selfrestructuringofpolyhydromethylsiloxanesbythehydridetransferprocessanewapproachtothecrosslinkingofpolysiloxanesandtothefabricationofthinpolysiloxanecoatings
AT rubinsztajnslawomir selfrestructuringofpolyhydromethylsiloxanesbythehydridetransferprocessanewapproachtothecrosslinkingofpolysiloxanesandtothefabricationofthinpolysiloxanecoatings
AT chojnowskijulian selfrestructuringofpolyhydromethylsiloxanesbythehydridetransferprocessanewapproachtothecrosslinkingofpolysiloxanesandtothefabricationofthinpolysiloxanecoatings
AT cyprykmarek selfrestructuringofpolyhydromethylsiloxanesbythehydridetransferprocessanewapproachtothecrosslinkingofpolysiloxanesandtothefabricationofthinpolysiloxanecoatings
AT uznanskipawel selfrestructuringofpolyhydromethylsiloxanesbythehydridetransferprocessanewapproachtothecrosslinkingofpolysiloxanesandtothefabricationofthinpolysiloxanecoatings
AT walkiewiczpietrzykowskaagnieszka selfrestructuringofpolyhydromethylsiloxanesbythehydridetransferprocessanewapproachtothecrosslinkingofpolysiloxanesandtothefabricationofthinpolysiloxanecoatings
AT fortuniakwitold selfrestructuringofpolyhydromethylsiloxanesbythehydridetransferprocessanewapproachtothecrosslinkingofpolysiloxanesandtothefabricationofthinpolysiloxanecoatings