Articles by Dave Dunn Ph.D.

Ask Dr. Dave: What is the difference between a polyurethane adhesive and a polyurea adhesive?

Dave Dunn's September 2014 column
The most important difference is that the polyurea reaction is much faster than the polyurethane one.
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Ask Dr. Dave: How can we get our adhesives approved for food/beverage or medical applications?

Dave Dunn's July 2014 column.

Food packaging is an industry that involves special requirements.


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Ask Dr. Dave: What is the best way to judge the effectiveness of an adhesive bond?

Dave Dunn's June 2014 column.
It is a common misperception that the material should always break before the adhesive bond.
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Ask Dr. Dave: What is a good adhesive for bonding glass to metal?

Dave Dunn's May 2014 column.

 Bonding glass to metals can be done successfully, although it is often necessary to choose systems that have appropriate "adhesion promoters." 


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Ask Dr. Dave: Is there a way to bond PTFE with regular adhesives?

Dave Dunn's April 2014 column.

It is necessary to treat the surface aggressively with chemical agents.


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Ask Dr. Dave: How can we ensure that UV-curable adhesives are always fully cured?

Dave Dunn's March 2014 column.

 One never gets a full 100% cure of these thermoset systems at relatively low temperatures because molecular mobility goes down dramatically as the adhesive increases in viscosity during curing. 


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Ask Dr. Dave: Could you please give us an overview of polyurethane adhesives?

Dave Dunn's February 2014 column.

 It’s important to understand that the term polyurethane covers a wide range of systems. 


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Ask Dr. Dave: How should I choose between an acrylic adhesive and an epoxy?

Dave Dunn's January 2014 column.

 Both types of adhesives are very versatile; the choice depends on your operating environments and manufacturing situation. 


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Ask Dr. Dave: December 2013

Are all cyanoacrylate adhesives brittle when cured?

Question: I am trying to bond several rubber parts together. I would like to try a cyanoacrylate adhesive, but I hear they are very brittle when cured. Is that true?


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Ask Dr. Dave: November 2013

Are epoxy adhesives with short cure times strong and durable?

QUESTION: I see many so-called “five-minute” epoxy adhesives (and sometimes ones with even shorter cure times). Are these adhesives truly strong and durable?


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Multimedia

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ASI April 2014 Photo Gallery

Our April 2014 issue is now available!

Podcasts

ExxonMobil Tackifier Expansion

Dwight Tozer, vice president of ExxonMobil’s Adhesion Industry business, discusses the company’s latest tackifier expansion project with Editor-in-Chief Susan Sutton.

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Adhesives & Sealants Industry Magazine

ASI Sept 2014 cover

2014 September

Our September issue features articles focusing on high-tech applications and raw materials, as well as a preview of the ASC Fall Convention and Expo. Check it out today!

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Handbook of Sealant Technology

The Handbook of Sealant Technology provides an in-depth examination of sealants, reviewing their historical developments and fundamentals, adhesion theories and properties, and today’s wide range of applications.

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ASI 2014 Buyers GuideASI's Buyers' Guide

Annual purchasing resource for equipment used in the manufacture/formulation of adhesives, sealants, pressure sensitives, tapes and labels and for application of finished adhesives. 

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