In general, there are two important groups of ASRs. Hydrophilic shell with enough thickness when absorbed at outer ASRs are commonly used at high levels ( 20 wt %īased on dry polymer) in emulsion polymerization to provideĮnough good colloidal stability therefore, they behave like In the twostage preparation process of amphiphilic core-shell polymers,ĪSRs are firstly dissolved in alkali aqueous solutions and thenįormed micelle-like aggregates above the critical aggregates concentration (CAC), which are followed by hydrophobic monomers polymerization to form core polymers within the aggregates. These amphiphilic core-shell polymers are usually prepared by emulsion polymerization using alkali-soluble resins (ASRs) as surfactants.10–18 ASRs areĬopolymers of monomers containing carboxylic acid or acid anhydride groups and some hydrophobic monomers. With relatively robust hydrophilic shell and hydrophobic coreĬan exhibit better pigment dispersion, wetting and rewet properties, and free-thaw stability. Particularly, the amphiphilic core-shell polymer dispersions8,9 When the core and shell polymers are optimally designed. Have attracted much attention in many applications,1–7 such asįilm fabrication, drug delivery, paper and textile manufacturingĪnd impact modifiers, by taking advantage of the syn ergicallyĮnhanced properties over their single-component counterparts Over the past decades, core-shell latexes in size of nanometers Received 27 August 2012 accepted 28 September 2012 published online 18 October 2012 KEYWORDS: emulsion polymerization surfactants properties and characterization 128: 4224–4230, 2013Īnd steric stabilization after incorporation of long alkyl chain. Compared with SMA, the improvement of emulsification efficiency of its hemiesters may come from the better hydrophilic-lipophilic balanceĬ 2012 Wiley Periodicals, Inc. Characterization of latexes by Zetasizer and transmissionĮlectron microscopy revealed that particles of these latexes have core-shell nanostructure with average particle size below 60 nm. In the end, we successfully prepared stable latexes using above three good surfactants with relatively low surfactant concentration and high solid content.
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Of emulsion polymerization of methyl methacrylate and butyl acrylate using these hemiesters as sole surfactants showed that SMA-C1275, SMA-C14-70, and SMA-C16-65 were good surfactants. Indicating that modification of SMA resin with long alkyl chains could improve their emulsification efficiency. The critical aggregates concentration of the prepared hemiester was lower than SMA,
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Wang (E-mail: series of alkali-soluble resins were prepared from esterification reaction of styrene-maleic anhydride copolymer (SMA) andįour fatty alcohols having different alkyl chains. Laboratory of Functional Polymer Resin, CNOOC Changzhou Paint and Coating Industry Research Institute,Ĭhangzhou, Jiangsu 213016, People’s Republic of ChinaĬorrespondence to: M. Muli Wang, Zhijun Ma, Dong Zhu, Dongyang Zhang, Wu Yin Core-Shell Latex Synthesized by Emulsion Polymerization UsingĪn Alkali-Soluble Resin as Sole Surfactant