Surface-Functionalized Polystyrene Latexes Using Itaconate-Based
Surfmers
Version 2 2018-09-20, 18:19
Version 1 2018-09-19, 15:52
Posted on 2018-09-20 - 18:19
Itaconic acid was
readily transformed to a series of amphiphilic
diesters via stepwise esterification of itaconic anhydride; the diesters
carry one alkyl (cetyl or octyl) group and either a PEG, glyceryl,
or dopamine segment. These diesters were used as surfmers for the
preparation of polystyrene (PS) emulsions, with the expectation that
the surface of the emulsion particles would carry PEG, glyceryl or
dopamine units. NMR spectroscopic studies revealed that the surfmers
were covalently incorporated into the polystyrene chains; furthermore,
NMR tube polymerization experiments also confirmed that when the PEG
surfmer was used, the PEG segments are indeed present on the surface
of the emulsion particles. The size of the PEGlyated PS emulsions
was readily varied from 35 to 140 nm by changing the mole fraction
of surfmer used. In the case of the glyceryl and dopamine carrying
surfmers, an octyl unit was used as the hydrophobic segment to
ensure appropriate hydrophobic–hydrophilic balance; it was
noticed that significantly larger mole fractions of the surfmers were
required (15–20 mol %) to generate stable emulsions with particle
sizes of about 150 nm. The PS emulsions carrying dopamine units on
the surface were found to adhere to glass surfaces; thus suggesting
that such “sticky” emulsion particles could be used
to functionalize different types of surfaces. Finally, itaconate diesters
bearing cetyl and perfluorooctyl segments were also prepared and shown
to copolymerize with styrene to generate fluoroalkyl-enriched PS copolymers;
these were used to generate hydrophobic coatings, with water contact
angles of over 120°. Thus, itaconate-based surfmers are readily
accessible alternatives for the preparation of emulsions with tailored
size and surface functionality.
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Chakraborty, Saheli; Ramakrishnan, S. (2018). Surface-Functionalized Polystyrene Latexes Using Itaconate-Based
Surfmers. ACS Publications. Collection. https://doi.org/10.1021/acs.langmuir.8b01708
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