Oxygen Inhibition of Radical Polymerizations Investigated with the Rheometric Quartz Crystal Microbalance
| Autor: | C. Joshua Yeh, Michael Hu, Kenneth R. Shull |
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| Rok vydání: | 2018 |
| Předmět: |
Materials science
Polymers and Plastics Organic Chemistry chemistry.chemical_element 030206 dentistry 02 engineering and technology Quartz crystal microbalance 021001 nanoscience & nanotechnology Nitrogen Oxygen Inorganic Chemistry 03 medical and health sciences 0302 clinical medicine Rheology chemistry Polymerization Chemical engineering Shutter Temporal resolution Materials Chemistry 0210 nano-technology Curing (chemistry) |
| Zdroj: | Macromolecules. 51:5511-5518 |
| ISSN: | 1520-5835 0024-9297 |
| Popis: | The use of the rheometric quartz crystal microbalance (QCM) as a quantitative cure monitor for photocuring systems was demonstrated. The technique requires the use of films with thicknesses in the micrometer range and is based on the direct measurement of the rheological properties of the film at a frequency of 15 MHz. To access curing processes much faster than the ∼1 s resolution of the QCM measurement, a rotating shutter system was designed to capture processes with a temporal resolution of ∼1 ms. The photocuring process was studied in both air and nitrogen environments and was applied to a traditional, radically polymerized acrylic system and a thiol–ene based system. Thiol–ene systems cured in oxygen reach comparable stiffnesses to those cured in nitrogen but take longer to cure and contain 1–2.5 wt % oxygen in the final materials. These results indicate that the QCM can be utilized as an effective photorheometric technique able to provide useful mechanistic insight into photoreactive processes. |
| Databáze: | OpenAIRE |
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