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
Abstract
:1. Introduction
2. Experimental Section
2.1. Materials
2.2. Analytical Methods
2.3. Restructuring of PHMS
2.4. Preparation and Characteristics of Thin Films
2.5. Theoretical Calculations
3. Results and Discussion
3.1. Study of Restructuring Process
3.2. Preparation and Characteristics of Thin Films
4. Conclusions
Supplementary Materials
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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No. | Reaction | ΔH298 Kcal/mol | ΔG298 Kcal/mol | r(H-B) Å |
---|---|---|---|---|
1 | 2 Me3SiOSiHMeOSiMe3 → Me3SiOSiMeH2 + (Me3SiO)3SiMe | −3.2 | −5.3 | |
2 | Me3SiOSiHMeOSiMe3 + Me3SiOSiMeH2 → MeSiH3 + (Me3SiO)3SiMe | −10.1 | −7.4 | |
3 | Me3SiH + B(C6F5)3 → Me3SiH-B(C6F5)3 | −8.5 | 4.0 | 1.516 |
4 | Me2SiH2 + B(C6F5)3 → Me2SiH2-B(C6F5)3 | −5.6 | 4.9 | 2.302 |
5 | MeSiH3 + B(C6F5)3 → MeSiH3-B(C6F5)3 | −3.9 | 5.7 | 2.540 |
6 | Me3SiOSiHMeOSiMe3 + B(C6F5)3 → (Me3SiO)2SiMeH-B(C6F5)3 | −11.3 | 4.7 | 1.525 |
7 | (Me3Si)2O(+)(SiHMeOSiMeH2) (A) → (Me3Si)(MeH2Si)O(+)(SiHMeOSiMe3) (B) | −2.4 | −3.2 |
Experiment Number | Initial PHMS Concentration w% | [DH] mol/L | Time to Gelation Min | DH Conversion at Gelation % |
---|---|---|---|---|
1 | 10 | 1.3 | No Gel | No Gel |
2 | 20 | 2.6 | 260 | 76 |
3 | 30 | 4.0 | 6 | 60 |
Film # | Polymer Concentration/wt% | Time of Reaction/h | Initial % HMeSiO Conversion | Film Quality | % HMeSiO Conversion after 24 h @ RT | % HMeSiO Conversion after Postbake @150 °C |
---|---|---|---|---|---|---|
1 | 10 | 0.67 | 56.7 | Poor | 71.9 | 83.7 |
2 | 10 | 3 | 72.6 | Good | 77.4 | 88.5 |
3 | 10 | 24 | 82 | Good | ND | 86 |
4 | 20 | 2 | 70.4 | Good | 77 | 87.8 |
5 | 20 | 8 | 77 | Gel/Poor | ND | ND |
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Mizerska, U.; Rubinsztajn, S.; Chojnowski, J.; Cypryk, M.; Uznanski, P.; Walkiewicz-Pietrzykowska, A.; Fortuniak, W. 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. Materials 2022, 15, 6981. https://doi.org/10.3390/ma15196981
Mizerska U, Rubinsztajn S, Chojnowski J, Cypryk M, Uznanski P, Walkiewicz-Pietrzykowska A, Fortuniak W. 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. Materials. 2022; 15(19):6981. https://doi.org/10.3390/ma15196981
Chicago/Turabian StyleMizerska, Urszula, Slawomir Rubinsztajn, Julian Chojnowski, Marek Cypryk, Pawel Uznanski, Agnieszka Walkiewicz-Pietrzykowska, and Witold Fortuniak. 2022. "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" Materials 15, no. 19: 6981. https://doi.org/10.3390/ma15196981