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Keywords:

  • seed emulsion polymerization;
  • crosslinking;
  • MFT;
  • acrylates;
  • styrene

Abstract

Effect of crosslinking on minimum film formation temperature (MFT) and particle morphology was investigated using the latices composed by the combination of crosslinked soft core-hard shell. n-Butyl acrylate (nBA) and ethylene glycol dimethacrylate (EGDMA) were used to prepare crosslinked rubber with methylmethacrylate (MMA) or styrene (ST) as a hard plastic component. Ordinary batch (flooded with secondary monomer) and semicontinuous (starved feed) operations were employed to compare the thermal properties of composite latices resulting from the different mode of secondary polymerization. As the degree of crosslinking increases, MFT of the latices obtained by batch operation became higher than those by semibatch operation. Observation of microtomed sections of particles stained with RuO4 did not reveal much difference in particle morphologies between the two operations. There was a definite relationship between MFT and molecular weight of THF soluble fraction of composite polymers regardless the mode of operation.