Ask Dr. Dave

Ask Dr. Dave

April 1, 2009
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In his April 2009 column, Dr. Dave Dunn discusses the use of azo initiatiors to both heat-cure an acrylic adhesive and maximize its shelf life, and the best way to remove an aerobic-cure adhesive.

Question: Do you have any advice for using an azo initiator to both heat-cure an acrylic adhesive and maximize its shelf life?

Answer: Most people use azo initiators to avoid using peroxides, which are sensitive to metals, amines, etc. However, there are only three common azo initiators, and their reactivity is normally characterized by their so-called 10-hour half-lives at a specific temperature (i.e., 10 hours is the time at which 50% of the material is decomposed at that temperature). The most common azo initiator has a 10-hour half-life at 65

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