Synthesis of Thermally Expandable Microspheres Using Ethoxylated Trimethylolpropane Triacrylates as Crosslinking Agents

초록

Thermally expandable microspheres are synthesized by suspension polymerization using three ethoxylated trimethylolpropane triacrylates with different molecular weights as crosslinking agents. The polymeric shell is made of acrylonitrile and methacrylonitrile and iso-octane is encapsulated as blowing agent. As the crosslinking of shell increases, the shape of the microspheres changes from spherical to bumpy due to different local crosslinking density. The expansion behavior was influenced by types and amounts of crosslinking agents. Average size and thermal stability of expandable microspheres are increased by increasing the amount of crosslinking agent. The microspheres prepared with ethoxylated (6) trimethylolpropane triacrylate to achieve optimum crosslinking results in an excellent expansion performance.

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