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Interparticle cycloaddition reactions for morphology transition of coumarin-functionalized stimuli-responsive polymer nanoparticles prepared by surfactant-free dispersion polymerization

Asadi-Zaki, Niloofar LU ; Mardani, Hanieh ; Roghani-Mamaqani, Hossein and Shahi, Sina (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
; ; and
publishing date
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}},
}