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bis-Nitrile and bis-Dialkylcyanamide Platinum(II) Complexes as Efficient Catalysts for Hydrosilylation Cross-Linking of Siloxane Polymers
cis- and trans-Isomers of the platinum(II) nitrile complexes [PtCl(2)(NCR)(2)] (R = NMe(2), N(C(5)H(10)), Ph, CH(2)Ph) were examined as catalysts for hydrosilylation cross-linking of vinyl-terminated polydimethylsiloxane and trimethylsilyl-terminated poly(dimethylsiloxane-co-ethylhydrosiloxane) prod...
Autores principales: | , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2016
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6274487/ https://www.ncbi.nlm.nih.gov/pubmed/26959003 http://dx.doi.org/10.3390/molecules21030311 |
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author | Islamova, Regina M. Dobrynin, Mikhail V. Ivanov, Daniil M. Vlasov, Andrey V. Kaganova, Elena V. Grigoryan, Galina V. Kukushkin, Vadim Yu. |
author_facet | Islamova, Regina M. Dobrynin, Mikhail V. Ivanov, Daniil M. Vlasov, Andrey V. Kaganova, Elena V. Grigoryan, Galina V. Kukushkin, Vadim Yu. |
author_sort | Islamova, Regina M. |
collection | PubMed |
description | cis- and trans-Isomers of the platinum(II) nitrile complexes [PtCl(2)(NCR)(2)] (R = NMe(2), N(C(5)H(10)), Ph, CH(2)Ph) were examined as catalysts for hydrosilylation cross-linking of vinyl-terminated polydimethylsiloxane and trimethylsilyl-terminated poly(dimethylsiloxane-co-ethylhydrosiloxane) producing high quality silicone rubbers. Among the tested platinum species the cis-complexes are much more active catalysts than their trans-congeners and for all studied platinum complexes cis-[PtCl(2)(NCCH(2)Ph)(2)] exhibits the best catalytic activity (room temperature, c = 1.0 × 10(−4) mol/L, τ(pot-life) 60 min, τ(curing) 6 h). Although cis-[PtCl(2)(NCCH(2)Ph)(2)] is less active than the widely used Karstedt’s catalyst, its application for the cross-linking can be performed not only at room temperature (c = 1.0 × 10(−4) mol/L), but also, more efficiently, at 80 °C (c = 1.0 × 10(−4)–1.0 × 10(−5) mol/L) and it prevents adherence of the formed silicone rubbers to equipment. The usage of the cis- and trans-[PtCl(2)(NCR)(2)] complexes as the hydrosilylation catalysts do not require any inhibitors and, moreover, the complexes and their mixtures with vinyl- and trimethylsilyl terminated polysiloxanes are shelf-stable in air. Tested catalysts do not form colloid platinum particles after the cross-linking. |
format | Online Article Text |
id | pubmed-6274487 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2016 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-62744872018-12-28 bis-Nitrile and bis-Dialkylcyanamide Platinum(II) Complexes as Efficient Catalysts for Hydrosilylation Cross-Linking of Siloxane Polymers Islamova, Regina M. Dobrynin, Mikhail V. Ivanov, Daniil M. Vlasov, Andrey V. Kaganova, Elena V. Grigoryan, Galina V. Kukushkin, Vadim Yu. Molecules Article cis- and trans-Isomers of the platinum(II) nitrile complexes [PtCl(2)(NCR)(2)] (R = NMe(2), N(C(5)H(10)), Ph, CH(2)Ph) were examined as catalysts for hydrosilylation cross-linking of vinyl-terminated polydimethylsiloxane and trimethylsilyl-terminated poly(dimethylsiloxane-co-ethylhydrosiloxane) producing high quality silicone rubbers. Among the tested platinum species the cis-complexes are much more active catalysts than their trans-congeners and for all studied platinum complexes cis-[PtCl(2)(NCCH(2)Ph)(2)] exhibits the best catalytic activity (room temperature, c = 1.0 × 10(−4) mol/L, τ(pot-life) 60 min, τ(curing) 6 h). Although cis-[PtCl(2)(NCCH(2)Ph)(2)] is less active than the widely used Karstedt’s catalyst, its application for the cross-linking can be performed not only at room temperature (c = 1.0 × 10(−4) mol/L), but also, more efficiently, at 80 °C (c = 1.0 × 10(−4)–1.0 × 10(−5) mol/L) and it prevents adherence of the formed silicone rubbers to equipment. The usage of the cis- and trans-[PtCl(2)(NCR)(2)] complexes as the hydrosilylation catalysts do not require any inhibitors and, moreover, the complexes and their mixtures with vinyl- and trimethylsilyl terminated polysiloxanes are shelf-stable in air. Tested catalysts do not form colloid platinum particles after the cross-linking. MDPI 2016-03-05 /pmc/articles/PMC6274487/ /pubmed/26959003 http://dx.doi.org/10.3390/molecules21030311 Text en © 2016 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons by Attribution (CC-BY) license (http://creativecommons.org/licenses/by/4.0/). |
spellingShingle | Article Islamova, Regina M. Dobrynin, Mikhail V. Ivanov, Daniil M. Vlasov, Andrey V. Kaganova, Elena V. Grigoryan, Galina V. Kukushkin, Vadim Yu. bis-Nitrile and bis-Dialkylcyanamide Platinum(II) Complexes as Efficient Catalysts for Hydrosilylation Cross-Linking of Siloxane Polymers |
title | bis-Nitrile and bis-Dialkylcyanamide Platinum(II) Complexes as Efficient Catalysts for Hydrosilylation Cross-Linking of Siloxane Polymers |
title_full | bis-Nitrile and bis-Dialkylcyanamide Platinum(II) Complexes as Efficient Catalysts for Hydrosilylation Cross-Linking of Siloxane Polymers |
title_fullStr | bis-Nitrile and bis-Dialkylcyanamide Platinum(II) Complexes as Efficient Catalysts for Hydrosilylation Cross-Linking of Siloxane Polymers |
title_full_unstemmed | bis-Nitrile and bis-Dialkylcyanamide Platinum(II) Complexes as Efficient Catalysts for Hydrosilylation Cross-Linking of Siloxane Polymers |
title_short | bis-Nitrile and bis-Dialkylcyanamide Platinum(II) Complexes as Efficient Catalysts for Hydrosilylation Cross-Linking of Siloxane Polymers |
title_sort | bis-nitrile and bis-dialkylcyanamide platinum(ii) complexes as efficient catalysts for hydrosilylation cross-linking of siloxane polymers |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6274487/ https://www.ncbi.nlm.nih.gov/pubmed/26959003 http://dx.doi.org/10.3390/molecules21030311 |
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