An Evaluation of Optical Absorbance Kinetics for the Detection of Micro-Porosity in Molecularly Doped Polymer Thin-Films
The use of optical absorbance kinetics to identify micro-porous regions in doped polymer films is evaluated. Data are presented for a series of hydrazone doped polymer films which are found to optically bleach upon exposure to an ultra violet (UV) radiation source. The UV absorbance kinetics are fou...
| Main Authors: | , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2021-04-01
|
| Series: | Solids |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2673-6497/2/2/10 |
| _version_ | 1797520798418731008 |
|---|---|
| author | David Mitchell Goldie Orlaith Skelton Thomas James Bailey |
| author_facet | David Mitchell Goldie Orlaith Skelton Thomas James Bailey |
| author_sort | David Mitchell Goldie |
| collection | DOAJ |
| description | The use of optical absorbance kinetics to identify micro-porous regions in doped polymer films is evaluated. Data are presented for a series of hydrazone doped polymer films which are found to optically bleach upon exposure to an ultra violet (UV) radiation source. The UV absorbance kinetics are found to exhibit distinctive characteristics for the various polymers studied, with changes in film absorbance occurring either in a fast (<10<sup>3</sup> s) or slow (>10<sup>4</sup> s) timescale. An interpretation of these distinctive timescales based upon a cellular-automata model of the absorbance kinetics suggests that the underlying photo-oxidation of the hydrazone is highly sensitive to underlying micro-porosity in the films which controls the necessary supply of absorbed oxygen for photo-cyclic reaction. |
| first_indexed | 2024-03-10T08:03:42Z |
| format | Article |
| id | doaj.art-25e1d40bde6c4895b379627df58226ef |
| institution | Directory Open Access Journal |
| issn | 2673-6497 |
| language | English |
| last_indexed | 2024-03-10T08:03:42Z |
| publishDate | 2021-04-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Solids |
| spelling | doaj.art-25e1d40bde6c4895b379627df58226ef2023-11-22T11:15:34ZengMDPI AGSolids2673-64972021-04-012215516410.3390/solids2020010An Evaluation of Optical Absorbance Kinetics for the Detection of Micro-Porosity in Molecularly Doped Polymer Thin-FilmsDavid Mitchell Goldie0Orlaith Skelton1Thomas James Bailey2School of Science and Engineering, University of Dundee, Dundee DD1 4HN, UKSchool of Science and Engineering, University of Dundee, Dundee DD1 4HN, UKSchool of Science and Engineering, University of Dundee, Dundee DD1 4HN, UKThe use of optical absorbance kinetics to identify micro-porous regions in doped polymer films is evaluated. Data are presented for a series of hydrazone doped polymer films which are found to optically bleach upon exposure to an ultra violet (UV) radiation source. The UV absorbance kinetics are found to exhibit distinctive characteristics for the various polymers studied, with changes in film absorbance occurring either in a fast (<10<sup>3</sup> s) or slow (>10<sup>4</sup> s) timescale. An interpretation of these distinctive timescales based upon a cellular-automata model of the absorbance kinetics suggests that the underlying photo-oxidation of the hydrazone is highly sensitive to underlying micro-porosity in the films which controls the necessary supply of absorbed oxygen for photo-cyclic reaction.https://www.mdpi.com/2673-6497/2/2/10molecularly doped polymeroptical absorbance kineticsmicro-porosity |
| spellingShingle | David Mitchell Goldie Orlaith Skelton Thomas James Bailey An Evaluation of Optical Absorbance Kinetics for the Detection of Micro-Porosity in Molecularly Doped Polymer Thin-Films Solids molecularly doped polymer optical absorbance kinetics micro-porosity |
| title | An Evaluation of Optical Absorbance Kinetics for the Detection of Micro-Porosity in Molecularly Doped Polymer Thin-Films |
| title_full | An Evaluation of Optical Absorbance Kinetics for the Detection of Micro-Porosity in Molecularly Doped Polymer Thin-Films |
| title_fullStr | An Evaluation of Optical Absorbance Kinetics for the Detection of Micro-Porosity in Molecularly Doped Polymer Thin-Films |
| title_full_unstemmed | An Evaluation of Optical Absorbance Kinetics for the Detection of Micro-Porosity in Molecularly Doped Polymer Thin-Films |
| title_short | An Evaluation of Optical Absorbance Kinetics for the Detection of Micro-Porosity in Molecularly Doped Polymer Thin-Films |
| title_sort | evaluation of optical absorbance kinetics for the detection of micro porosity in molecularly doped polymer thin films |
| topic | molecularly doped polymer optical absorbance kinetics micro-porosity |
| url | https://www.mdpi.com/2673-6497/2/2/10 |
| work_keys_str_mv | AT davidmitchellgoldie anevaluationofopticalabsorbancekineticsforthedetectionofmicroporosityinmolecularlydopedpolymerthinfilms AT orlaithskelton anevaluationofopticalabsorbancekineticsforthedetectionofmicroporosityinmolecularlydopedpolymerthinfilms AT thomasjamesbailey anevaluationofopticalabsorbancekineticsforthedetectionofmicroporosityinmolecularlydopedpolymerthinfilms AT davidmitchellgoldie evaluationofopticalabsorbancekineticsforthedetectionofmicroporosityinmolecularlydopedpolymerthinfilms AT orlaithskelton evaluationofopticalabsorbancekineticsforthedetectionofmicroporosityinmolecularlydopedpolymerthinfilms AT thomasjamesbailey evaluationofopticalabsorbancekineticsforthedetectionofmicroporosityinmolecularlydopedpolymerthinfilms |