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Donald H. Campbell - Calculation of Crosslink Density of Thermoset Polymers. A Simpler Method.

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Donald H. Campbell - Calculation of Crosslink Density of Thermoset Polymers. A Simpler Method.

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Donald H. Campbell
Chemist
BASF Corporation
(248) 948-2343
www.basf.com


 

Abstract

 

The practice of calculating the crosslink density of a polymer network has been described by numerous authors going back to Flory.  In most cases, the format for the calculations is based on a derivation.  This can make the calculations quite difficult, and in some cases, terms are reused referring to both the prepolymer constants and those of the final network.   We have reformatted these calculations into a more intuitive process based on prepolymer constants that are familiar to coatings chemists. 
We demonstrate the equivalence of these calculations to those of previous authors for various degrees of prepolymer functionality in a condensation crosslink reaction.  Crosslink density measurements are presented to validate the effect of prepolymer degree of functionality that has been questioned by some.  We also apply these methods to ultraviolet light cured systems and derive the relationship between kinetic chain length and crosslink density for several acrylate oligomers.

 

Biography

Don graduated with a BS in Chemistry from Wayne State University in Detroit in 1984 and joined BASF Automotive Coatings.  He has worked in both resin development and topcoat development including basecoat, clearcoat and 3-wet systems.  With his experience managing clearcoat service for more than 15 paint lines, Don is now moving to a role as Intellectual Property Manager.  After 32 years with BASF, he has 32 patents and has published numerous articles.

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