Ask Dr. Dave

Ask Dr. Dave

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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Dunn

Q&A Exchange is written by Dave Dunn, Ph.D., of F.L.D.Enterprises, a technical consultancy and full-service industrial market-research firm specializing in the adhesives, sealants, specialty rubbers and plastics fields. Dave is a former vice president and director of Loctite Corp. and has spent many years in troubleshooting adhesive and sealant problems. Questions for publication should be directed to him at 242 Trails End, Aurora OH 44202; phone 330-562-2930; fax (330) 247-1690; or email DrDave242@windstream.net .

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