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Photoswitchable layer-by-layer coatings based on photochromic polynorbornenes bearing spiropyran side groups
Campos, Paula; Dunne, Aishling; Delaney, Colm; Moloney, Cara; Moulton, Simon E.; Benito-Lopez, Fernando; Ferreira, Marystela; Diamond, Dermot; Florea, Larisa
Herein, we present the synthesis of linear photochromic norbornene polymers bearing spiropyran side groups (poly(SP-R)), and their assembly into LbL films on glass substrates when converted to the poly(MC-R) under UV irradiation. The LbL films were composed of bilayers of poly(allylamine hydrochloride) (PAH) and poly(MC-R), forming (PAH/poly(MC-R))n coatings. The MC form presents a significant absorption band in the visible spectral region which allowed the LbL deposition process to be tracked by UV-Vis spectroscopy, showing a linear increase of the characteristic MC absorbance band with increased number of bilayers. The thickness and morphology of the (PAH/poly(MC-R))n films were characterised by ellipsometry and Scanning Electron Microscopy, showing a height of ~27.5 nm for the first bilayer and an overall height of ~165 nm for the (PAH/poly(MC-R))5 multilayer film. Prolonged white light irradiation (22h) showed a gradual decrease of the MC band by 90.4 ±2.9% relative to the baseline, indicating the potential application of these films as coatings for photo-controlled delivery systems.
Keyword(s): Photochemistry; Organic chemistry; Chemistry; Layer-by-Layer; Spiropyran; Photo-responsive; Photochromic; Coatings
Publication Date:
2018
Type: Other
Peer-Reviewed: Unknown
Language(s): English
Institution: Dublin City University
Citation(s): Campos, Paula, Dunne, Aishling, Delaney, Colm ORCID: 0000-0002-4397-0133 <https://orcid.org/0000-0002-4397-0133>, Moloney, Cara, Moulton, Simon E., Benito-Lopez, Fernando ORCID: 0000-0001-8366-4790 <https://orcid.org/0000-0001-8366-4790>, Ferreira, Marystela, Diamond, Dermot ORCID: 0000-0003-2944-4839 <https://orcid.org/0000-0003-2944-4839> and Florea, Larisa ORCID: 0000-0002-4704-2393 <https://orcid.org/0000-0002-4704-2393> (2018) Photoswitchable layer-by-layer coatings based on photochromic polynorbornenes bearing spiropyran side groups. Langmuir, 34 (14). pp. 4210-4216. ISSN 0743-7463
Publisher(s): American Chemical Society
File Format(s): application/pdf
Related Link(s): http://doras.dcu.ie/22311/1/P_Campos_Langmuir_Doras.pdf,
https://doi.org/10.1021/acs.langmuir.8b00137
First Indexed: 2018-05-15 06:05:14 Last Updated: 2019-02-09 06:10:06