Synthesis and characterization of poly(n-butyl acrylate)-poly (methyl methacrylate)latex interpenetrating polymer networks by radiation-induced seeded emulsion polymerization

摘要

A series of latex interpenetrating polymer networks(LIPNs)were prepared via a two-stage emulsion polymerization of methyl methacrylate(MMA)or mixture of MMA and n-butyl acrylate(n-BA)on crosslinked poly(n-butyl acrylate)(PBA)seed latex using ~(60)Co gamma-ray radiation.The particles of resultant latex were produced with diameters between 150 and 250 nm.FTIR spectra identified the formation of crosslinked copolymers of PMMA or P(MMA-co-BA).Dynamic light scattering(DLS)showed that with increasing n-BA concentration in second-stage monomers,the particle size of LIPN increased.Transmission electron microscope(TEM)photographs showed that the morphology of resultant acrylate interpenetrating polymer network(IPN)latex varied from the distinct core-shell structure to homogenous particle structure with the increase of n-BA concentration,and the morphology was mainly controlled by the miscibility between crosslinked PBA seed and second-stage copolymers and polarity of P(MMA-co-BA)copolymers.In addition,differential scanning calorimeter(DSC)measurements indicated the existence of reinforced miscibility between PBA seed and P(MMA-co-BA)copolymer in prepared LIPNs.