Interparticle cycloaddition reactions for morphology transition of coumarin-functionalized stimuli-responsive polymer nanoparticles prepared by surfactant-free dispersion polymerization
(2021) In Polymer 228.- Abstract
Stimuli-responsive polymer nanoparticles were synthesized by surfactant-free dispersion polymerization of styrene and 2-(dimethylamino)ethyl methacrylate (DMAEMA) in three different contents of divinylbenzene intraparticle crosslinking agent. Incorporation of the hydrophilic DMAEMA comonomer during the polymerization yielded pH-responsive nanogels with a higher size than the polystyrene nanoparticles. Surface of the nanoparticles was decorated with 7-hydroxyl-4-methylcoumarin (HMC) via an esterification reaction to yield stimuli-responsive fluorescent nanogels. The monodispersed polymer nanoparticles with spherical morphology were turned into chain-like coupled structures because of interparticle cycloaddition reactions between the... (More)
Stimuli-responsive polymer nanoparticles were synthesized by surfactant-free dispersion polymerization of styrene and 2-(dimethylamino)ethyl methacrylate (DMAEMA) in three different contents of divinylbenzene intraparticle crosslinking agent. Incorporation of the hydrophilic DMAEMA comonomer during the polymerization yielded pH-responsive nanogels with a higher size than the polystyrene nanoparticles. Surface of the nanoparticles was decorated with 7-hydroxyl-4-methylcoumarin (HMC) via an esterification reaction to yield stimuli-responsive fluorescent nanogels. The monodispersed polymer nanoparticles with spherical morphology were turned into chain-like coupled structures because of interparticle cycloaddition reactions between the surface HMC moieties upon UV irradiation, as shown by scanning and transmission electron microscopies. Dimerization of the HMC-functionalized nanoparticles was investigated by ultraviolet–visible spectrophotometer and fluorescence spectroscopy. Size and its distribution for the nanoparticles before and after light irradiation were determined using dynamic light scattering. From a different view, decreasing the intraparticle crosslinking density and also purging the colloidal dispersions with CO2 were resulted in a higher mean particle size. Variation of particle size by purging CO2 and consequently at different pH values was resulted in different fluorescence characteristics. Therefore, these stimuli-responsive fluorescent nanoparticles were finally used as a pH indicator in the presence of CO2 gas or even at different pH values using fluorescence spectroscopy.
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- author
- Asadi-Zaki, Niloofar LU ; Mardani, Hanieh ; Roghani-Mamaqani, Hossein and Shahi, Sina
- publishing date
- 2021-07-16
- type
- Contribution to journal
- publication status
- published
- keywords
- Coumarin-decoration, Interparticle and intraparticle crosslinking, Morphology transition, Polymer nanoparticle, Surfactant-free dispersion polymerization
- in
- Polymer
- volume
- 228
- article number
- 123899
- publisher
- Elsevier
- external identifiers
-
- scopus:85107150286
- ISSN
- 0032-3861
- DOI
- 10.1016/j.polymer.2021.123899
- language
- English
- LU publication?
- no
- id
- 62c10bbf-33bf-400b-9eac-670bd0874fbd
- date added to LUP
- 2024-09-16 09:59:45
- date last changed
- 2024-09-20 09:20:20
@article{62c10bbf-33bf-400b-9eac-670bd0874fbd, abstract = {{<p>Stimuli-responsive polymer nanoparticles were synthesized by surfactant-free dispersion polymerization of styrene and 2-(dimethylamino)ethyl methacrylate (DMAEMA) in three different contents of divinylbenzene intraparticle crosslinking agent. Incorporation of the hydrophilic DMAEMA comonomer during the polymerization yielded pH-responsive nanogels with a higher size than the polystyrene nanoparticles. Surface of the nanoparticles was decorated with 7-hydroxyl-4-methylcoumarin (HMC) via an esterification reaction to yield stimuli-responsive fluorescent nanogels. The monodispersed polymer nanoparticles with spherical morphology were turned into chain-like coupled structures because of interparticle cycloaddition reactions between the surface HMC moieties upon UV irradiation, as shown by scanning and transmission electron microscopies. Dimerization of the HMC-functionalized nanoparticles was investigated by ultraviolet–visible spectrophotometer and fluorescence spectroscopy. Size and its distribution for the nanoparticles before and after light irradiation were determined using dynamic light scattering. From a different view, decreasing the intraparticle crosslinking density and also purging the colloidal dispersions with CO<sub>2</sub> were resulted in a higher mean particle size. Variation of particle size by purging CO<sub>2</sub> and consequently at different pH values was resulted in different fluorescence characteristics. Therefore, these stimuli-responsive fluorescent nanoparticles were finally used as a pH indicator in the presence of CO<sub>2</sub> gas or even at different pH values using fluorescence spectroscopy.</p>}}, author = {{Asadi-Zaki, Niloofar and Mardani, Hanieh and Roghani-Mamaqani, Hossein and Shahi, Sina}}, issn = {{0032-3861}}, keywords = {{Coumarin-decoration; Interparticle and intraparticle crosslinking; Morphology transition; Polymer nanoparticle; Surfactant-free dispersion polymerization}}, language = {{eng}}, month = {{07}}, publisher = {{Elsevier}}, series = {{Polymer}}, title = {{Interparticle cycloaddition reactions for morphology transition of coumarin-functionalized stimuli-responsive polymer nanoparticles prepared by surfactant-free dispersion polymerization}}, url = {{http://dx.doi.org/10.1016/j.polymer.2021.123899}}, doi = {{10.1016/j.polymer.2021.123899}}, volume = {{228}}, year = {{2021}}, }