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Highlights: [•] Preparation of morphology controllable latex particles with controlling the multistage emulsion polymerization. [•] Preparation of uniform 100nm asymmetric Janus particles using a partial-encapsulation mechanism. [•] Partially encapsulated acorn-like latex particles with hydrophobic PSt-layer. [•] The hydrophilic cores could be fully encapsulated by the hydrophobic PSt-layer with adding moderate polarity PMMA interlayer. [Copyright &y& Elsevier]

• The antimicrobial cationic acrylate-based copolymer (PAMs) was facilely synthesized via soap-free emulsion polymerization. • I PAMs exhibited excellent antibacterial properties based on quaternary ammonium compound of polymer chains. • Owing to effective combination between the inorganic filler and PAMs, the coatings are better than that of single materials. • The PAMs coating couldn't only decorate walls, but also improve environmental hygiene. Microorganism contamination on substrate surfaces is arousing increasingly concern as a serious health issue. In this study, we described fabricating antimicrobial cationic acrylate-based composite and investigating it as antimicrobial coatings of interior walls in buildings. Firstly, utilizing 3-(methacryloylamino) propyltrimethyl ammonium chloride (MPAC) and acrylates (BA, MMA) as monomers, a novel antimicrobial cationic acrylate-based copolymers (PAMs) was synthesized from surfactant-free emulsion polymerization (SfEP). The synthesis conditions, structures and physical properties of copolymers (PAMs) and its film (PAMs-F) were investigated through FT-IR, SEM, TEM and scratch test, etc. The results revealed that 6 % of MPAC and 0.5 % of KPS enabled the film-forming properties and enhanced conversion rate of PAMs, as well as endowed PAMs-F with significant antimicrobial activity. Furthermore, the PAMs based coating (PAMs-C) was prepared by PAMs and inorganic fillers. And the antimicrobial activity of PAMs-F and PAMs-C was measured, the effects of cationic monomer and nano-TiO 2 were also investigated. The results indicated that PAMs-C was able to use to protect the building interior wall from microbial contamination. [ABSTRACT FROM AUTHOR]