Core‐shell latex synthesized by emulsion polymerization using an alkali‐soluble resin as sole surfactant

Abstract

A series of alkali‐soluble resins were prepared from esterification reaction of styrene‐maleic anhydride copolymer (SMA) and four fatty alcohols having different alkyl chains. The critical aggregates concentration of the prepared hemiester was lower than SMA, indicating that modification of SMA resin with long alkyl chains could improve their emulsification efficiency. The detailed experiments of emulsion polymerization of methyl methacrylate and butyl acrylate using these hemiesters as sole surfactants showed that SMA‐C12‐75, SMA‐C14‐70, and SMA‐C16‐65 were good surfactants. In the end, we successfully prepared stable latexes using above three good surfactants with relatively low surfactant concentration and high solid content. Characterization of latexes by Zetasizer and transmission electron microscopy revealed that particles of these latexes have core‐shell nanostructure with average particle size below 60 nm. Compared with SMA, the improvement of emulsification efficiency of its hemiesters may come from the better hydrophilic‐lipophilic balance and steric stabilization after incorporation of long alkyl chain. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013

Aqueous poly(vinyl acetate)-based core/shell emulsion: synthesis, morphology, properties and application

“…In addition, it has been reported that other factors, including the type and nature of surfactant, [127][128][129][130][131] cross-linking degree of core and/or shell polymers, [132][133][134][135] could also affect the formation of PVAc-CS structured emulsion and have been widely investigated.…”

Fabrication and morphological evolution of inverse core/shell structural latex particles of poly(vinyl acetate)/polystyrene by maleic anhydride grafting

“…Although many researches of CS structure have been reported [9][10][11][12][13][14][15] in the past few decades, the preparation of amphiphilic CS structural latex particles [16,17] that have a large difference of hydrophilicity between well-defined core and shell was still a technical difficulty because of the trouble of emulsion stability and the difference of reactivity ratio between core monomer and shell monomer. Significant advances on various methods, such as grafting [18][19][20], interpenetrating polymer network [21,22] and ionic bonding [23], have been reported as potential manufacturing approaches for amphiphilic CS latex particles.…”

Synthesis and properties study of alkali soluble resin fortified polyacrylate latex

“…1,2 At pH >7, soluble ASR is used as a polymer surfactant in emulsion polymerization to provide electrostatic spatial stability to the latex particles. 3 During the polymerization process, ASR is grafted to the main polymer by double bond or chain transfer reaction, 4 thus overcoming the disadvantages of poor wetting, poor surface adhesion and low gloss. 5,6 The present research on ASR as a polymer surfactant for emulsion polymerization has focused on the polymerization process 1,[7][8][9][10][11] and the film formation process.…”

“…ASRs are widely used in emulsion polymerization and are a special type of copolymers classified as anionic hydrophobic polyelectrolytes with molecular weight between 500 and 20,000 Da, having a hydrophobic backbone, hydrophilic side groups, and a random distribution of side chain carboxyl groups 1,2 . At pH >7, soluble ASR is used as a polymer surfactant in emulsion polymerization to provide electrostatic spatial stability to the latex particles 3 . During the polymerization process, ASR is grafted to the main polymer by double bond or chain transfer reaction, 4 thus overcoming the disadvantages of poor wetting, poor surface adhesion and low gloss 5,6 …”