Abstract
Abstract In this paper, thermoexpandable polymeric microspheres were prepared by suspension polymerization with acrylonitrile (AN) and methyl methacrylate (MMA) as monomers and i -butane as a blowing agent. The micromorphology and thermal stability were researched by polarized microscopy and TGA. The diameter of the expandable microspheres increased from about 20 μm (unexpanded) to 40–80 μm (expanded) upon heating. The maximum expansion volume was higher than 22 times of the original volume and the density of the expanded microspheres was about 16.7 kg/m 3 . The blowing agent content in microspheres was about 20 wt% and T o.e. , T m.e. and T o.s. were 80 °C, 120–130 °C and 140–145 °C, respectively.
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