Preparation of novel film-forming armoured latexes using silica nanoparticles as a pickering emulsion stabiliser

Hana Shiraz, Simon J. Peake, Tim Davey, Neil R. Cameron, Rico F. Tabor

Research output: Contribution to journalArticleResearchpeer-review

4 Citations (Scopus)

Abstract

Hypothesis: Film-forming polymer latex particles of diameter <300 nm can be prepared in the complete absence of surfactants, stabilised in part by silica nanoparticles through a Pickering type emulsion polymerisation. Control of the silica wettability through modulation of reaction pH or by reaction of the nanoparticles with a hydrophobic silane results in silica-covered latex particles. Experiments: The oil-in-water polymerisation process used methyl methacrylate (MMA) and n-butyl acrylate (BA) as co-monomers, potassium persulphate (KPS) as an initiator and a commercially available colloidal nano-silica (Ludox®-TM40). It was found that pH control before polymerisation using methacrylic acid (MAA) facilitated the formation of armoured latexes, and mechanistic features of this process are discussed. An alternative, more robust protocol was developed whereby addition of vinyltriethoxysilane (VTES) to control wettability resulted in latexes completely armoured in colloidal nano-silica. The latexes were characterised using SEM, cryo-TEM and AFM imaging techniques. The mechanism behind the adsorption was investigated through surface pressure and contact angle measurements to understand the factors that influence this irreversible adsorption. Findings: Results indicate that nanoparticle attachment (but intriguingly not latex size) is dependent on particle wettability, providing new insight into the formation of nanoparticle-armoured latexes, along with opportunities for further development of diversely functionalized inorganic/organic polymer composite particles.

Original languageEnglish
Pages (from-to)289-300
Number of pages12
JournalJournal of Colloid and Interface Science
Volume528
DOIs
Publication statusPublished - 15 Oct 2018

Keywords

  • Emulsion polymerisation
  • Latexes
  • Nanoparticles
  • Pickering

Cite this

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title = "Preparation of novel film-forming armoured latexes using silica nanoparticles as a pickering emulsion stabiliser",
abstract = "Hypothesis: Film-forming polymer latex particles of diameter <300 nm can be prepared in the complete absence of surfactants, stabilised in part by silica nanoparticles through a Pickering type emulsion polymerisation. Control of the silica wettability through modulation of reaction pH or by reaction of the nanoparticles with a hydrophobic silane results in silica-covered latex particles. Experiments: The oil-in-water polymerisation process used methyl methacrylate (MMA) and n-butyl acrylate (BA) as co-monomers, potassium persulphate (KPS) as an initiator and a commercially available colloidal nano-silica (Ludox{\circledR}-TM40). It was found that pH control before polymerisation using methacrylic acid (MAA) facilitated the formation of armoured latexes, and mechanistic features of this process are discussed. An alternative, more robust protocol was developed whereby addition of vinyltriethoxysilane (VTES) to control wettability resulted in latexes completely armoured in colloidal nano-silica. The latexes were characterised using SEM, cryo-TEM and AFM imaging techniques. The mechanism behind the adsorption was investigated through surface pressure and contact angle measurements to understand the factors that influence this irreversible adsorption. Findings: Results indicate that nanoparticle attachment (but intriguingly not latex size) is dependent on particle wettability, providing new insight into the formation of nanoparticle-armoured latexes, along with opportunities for further development of diversely functionalized inorganic/organic polymer composite particles.",
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Preparation of novel film-forming armoured latexes using silica nanoparticles as a pickering emulsion stabiliser. / Shiraz, Hana; Peake, Simon J.; Davey, Tim; Cameron, Neil R.; Tabor, Rico F.

In: Journal of Colloid and Interface Science, Vol. 528, 15.10.2018, p. 289-300.

Research output: Contribution to journalArticleResearchpeer-review

TY - JOUR

T1 - Preparation of novel film-forming armoured latexes using silica nanoparticles as a pickering emulsion stabiliser

AU - Shiraz, Hana

AU - Peake, Simon J.

AU - Davey, Tim

AU - Cameron, Neil R.

AU - Tabor, Rico F.

PY - 2018/10/15

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