Elastomers and Composites

The Rubber Society of Korea (한국고무학회)
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A Study of Characteristics Variation of Thermally Expandable Microspheres in Post-polymerization Treatment by Various Initiators

  • Received : 2017.09.14
  • Accepted : 2017.09.26
  • Published : 2017.09.30
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Abstract

Thermally expandable microspheres were used as post-treatment initiators of potassium persulfate, sodium bisulfite, and sodium sulfide in order to improve the foaming ability and whiteness when foaming a mixture of thermally expandable microsphers and poly(vinyl chloride). Potassium persulfate showed no significant influence on the foaming behavior, foam expansion, whiteness, and yellowing, whereas in the case of using sodium bisulfite. In particular, sodium bisulfite demonstrated the best efficiency with 2 wt% treatment. The thermally expandable microspheres prepared herein can provide excellent foamability and whiteness, and are expected to be applicable in various fields such as general coating and wallpaper.

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References

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