Cationic Polymerization of Hexamethylcyclotrisiloxane in Excess Water
Ring-opening ionic polymerization of cyclosiloxanes in dispersed media has long been discovered, and is nowadays both fundamentally studied and practically used. In this short communication, we show some preliminary results on the cationic ring-opening polymerization of hexamethylcyclotrisiloxane (D...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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MDPI AG
2021-07-01
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| Series: | Molecules |
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| Online Access: | https://www.mdpi.com/1420-3049/26/15/4402 |
| _version_ | 1797525329022025728 |
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| author | Quentin Barnes Claire Longuet François Ganachaud |
| author_facet | Quentin Barnes Claire Longuet François Ganachaud |
| author_sort | Quentin Barnes |
| collection | DOAJ |
| description | Ring-opening ionic polymerization of cyclosiloxanes in dispersed media has long been discovered, and is nowadays both fundamentally studied and practically used. In this short communication, we show some preliminary results on the cationic ring-opening polymerization of hexamethylcyclotrisiloxane (D<sub>3</sub>), a crystalline strained cycle, in water. Depending on the catalyst or/and surfactants used, polymers of various molar masses are prepared in a straightforward way. Emphasis is given here on experiments conducted with tris(pentafluorophenyl)borane (BCF), where high-molar polymers were generated at room temperature. In surfactant-free conditions, µm-sized droplets are stabilized by silanol end-groups of thus generated amphiphilic polymers, the latter of which precipitate in the course of reaction through chain extension. Introducing various surfactants in the recipe allows generating smaller emulsions in size with close polymerization ability, but better final colloidal stability, at the expense of low small cycles’ content. A tentative mechanism is finally proposed. |
| first_indexed | 2024-03-10T09:11:16Z |
| format | Article |
| id | doaj.art-9489ed99b7034129ad493b1cf3a7e79a |
| institution | Directory Open Access Journal |
| issn | 1420-3049 |
| language | English |
| last_indexed | 2024-03-10T09:11:16Z |
| publishDate | 2021-07-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Molecules |
| spelling | doaj.art-9489ed99b7034129ad493b1cf3a7e79a2023-11-22T05:57:34ZengMDPI AGMolecules1420-30492021-07-012615440210.3390/molecules26154402Cationic Polymerization of Hexamethylcyclotrisiloxane in Excess WaterQuentin Barnes0Claire Longuet1François Ganachaud2Ingénierie des Matériaux Polymères, CNRS UMR 5223, INSA-Lyon, Univ Lyon, F-69621 Villeurbanne, FranceIMT—Mines Ales, Polymers Hybrids and Composites (PCH), 6 Avenue De Clavières, F-30319 Alès, FranceIngénierie des Matériaux Polymères, CNRS UMR 5223, INSA-Lyon, Univ Lyon, F-69621 Villeurbanne, FranceRing-opening ionic polymerization of cyclosiloxanes in dispersed media has long been discovered, and is nowadays both fundamentally studied and practically used. In this short communication, we show some preliminary results on the cationic ring-opening polymerization of hexamethylcyclotrisiloxane (D<sub>3</sub>), a crystalline strained cycle, in water. Depending on the catalyst or/and surfactants used, polymers of various molar masses are prepared in a straightforward way. Emphasis is given here on experiments conducted with tris(pentafluorophenyl)borane (BCF), where high-molar polymers were generated at room temperature. In surfactant-free conditions, µm-sized droplets are stabilized by silanol end-groups of thus generated amphiphilic polymers, the latter of which precipitate in the course of reaction through chain extension. Introducing various surfactants in the recipe allows generating smaller emulsions in size with close polymerization ability, but better final colloidal stability, at the expense of low small cycles’ content. A tentative mechanism is finally proposed.https://www.mdpi.com/1420-3049/26/15/4402Piers-Rubinsztajn catalystsurfactant-free polymerizationpolydimethylsiloxane |
| spellingShingle | Quentin Barnes Claire Longuet François Ganachaud Cationic Polymerization of Hexamethylcyclotrisiloxane in Excess Water Molecules Piers-Rubinsztajn catalyst surfactant-free polymerization polydimethylsiloxane |
| title | Cationic Polymerization of Hexamethylcyclotrisiloxane in Excess Water |
| title_full | Cationic Polymerization of Hexamethylcyclotrisiloxane in Excess Water |
| title_fullStr | Cationic Polymerization of Hexamethylcyclotrisiloxane in Excess Water |
| title_full_unstemmed | Cationic Polymerization of Hexamethylcyclotrisiloxane in Excess Water |
| title_short | Cationic Polymerization of Hexamethylcyclotrisiloxane in Excess Water |
| title_sort | cationic polymerization of hexamethylcyclotrisiloxane in excess water |
| topic | Piers-Rubinsztajn catalyst surfactant-free polymerization polydimethylsiloxane |
| url | https://www.mdpi.com/1420-3049/26/15/4402 |
| work_keys_str_mv | AT quentinbarnes cationicpolymerizationofhexamethylcyclotrisiloxaneinexcesswater AT clairelonguet cationicpolymerizationofhexamethylcyclotrisiloxaneinexcesswater AT francoisganachaud cationicpolymerizationofhexamethylcyclotrisiloxaneinexcesswater |