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In this work polystyrene/polyacrylate emulsions were obtained by a semi-continuous, seeded emulsion polymerization using methyl methacrylate (MMA), butyl acrylate (BA), butyl methacrylate (BMA), styrene (St) and 2-(methacryloyloxy)ethyl acetoacetate (AAEM) as monomers and polyether amine (D400) as crosslinker. The emulsion films were obtained by self-crosslinking of the emulsion at ambient temperature, and their mechanical and damping behaviors were investigated. Fourier transform infrared spectroscopy (FTIR) confirmed that crosslinking reactions between the acetoacetate groups of AAEM and amino groups of D400 had occurred and formed the C = C-N crosslinked structure. Moreover, tensile tests verified that the tensile strength of the film was significantly improved by the crosslinked structure, and its maximum reached 6.5 MPa, 211% higher than that of the uncrosslinked film. Besides, dynamic mechanical analysis (DMA) indicated that the crosslinking increased the glass transition temperature (Tg) and the corresponding activation energy () of the films. The results showed that the polystyrene/polyacrylate emulsion with 5 wt% AAEM and 3 wt% D400 possessed satisfying mechanical and damping properties. This work provides a reference for synthesizing self-crosslinking polystyrene/polyacrylate emulsions at ambient temperature.

Preparation and Properties of Polystyrene/Polyacrylate Emulsion Based on Acetoacetate/Diamine Self-crosslinking at Ambient Temperature