Insights into Photoinduced Sol–Gel Polymerization: An in Situ Infrared Spectroscopy Study
Photoacid-catalyzed sol–gel polymerization is now recognized as a powerful single-step synthetic approach to the synthesis of hybrid films, which can be distinguished from conventional sol–gel methods by higher reactivity and a solvent-free process. Despite its utility, the mechanism is not yet unde...
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| Veröffentlicht in: | The journal of physical chemistry. B 2012-05, Vol.116 (17), p.5260-5268 |
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| container_end_page | 5268 |
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| container_issue | 17 |
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| container_title | The journal of physical chemistry. B |
| container_volume | 116 |
| creator | De Paz, Héloïse Chemtob, Abraham Croutxé-Barghorn, Céline Le Nouen, Didier Rigolet, Séverinne |
| description | Photoacid-catalyzed sol–gel polymerization is now recognized as a powerful single-step synthetic approach to the synthesis of hybrid films, which can be distinguished from conventional sol–gel methods by higher reactivity and a solvent-free process. Despite its utility, the mechanism is not yet understood, in particular what chemical, physical, and photochemical parameters determine the precise sequence, kinetics, and advancement of this UV inorganic photopolymerization. Here, using mainly transmission real-time Fourier transformed infrared (RT-FTIR) spectroscopy, we characterize in situ the hydrolysis–condensation reactions of oligomeric silicon alkoxides and the formation of byproducts. Systematic review and assessment of numerous processing variables (relative humidity, film thickness, precursor structure, nature, and the concentration of photoacid generator) prove that the reaction kinetics are controlled by the two independent phenomena: the intrinsic chemical reaction rates and the water vapor permeation into the film. |
| doi_str_mv | 10.1021/jp212386e |
| format | Article |
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| source | ACS Publications |
| subjects | Assessments Chemical Sciences Film thickness Permeation Polymerization Polymers Reaction kinetics Relative humidity Sol gel process Water vapor |
| title | Insights into Photoinduced Sol–Gel Polymerization: An in Situ Infrared Spectroscopy Study |
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