432676 Encapsulation of Maleimide-Based Healing Agent and Reversible Diels-Alder Chemistry for Self-Healing and Corrosion Prevention

Monday, November 9, 2015
Exhibit Hall 1 (Salt Palace Convention Center)
Sadella Santos and Giuseppe R. Palmese, Chemical and Biological Engineering, Drexel University, Philadelphia, PA

Encapsulation of Maleimide-Based Healing Agent and Reversible Diels-Alder Chemistry for Self-Healing and Corrosion Prevention

Sadella Santos1, Giuseppe Palmese*1

 

1Department of Chemical & Biological Engineering, Drexel University, Philadelphia, Pennsylvania, 19104, United States

ABSTRACT

 

Protective epoxy coatings for metal substrates are used for wear resistance and physical protection against environment conditions that may result in physical or chemical changes, such as corrosion. Previous work done by Pratama et. al 1 investigated the use of encapsulated solutions containing maleimide-based healing agents for self-healing of furan functionalized epoxy networks through reversible Diels-Alder chemistry. Results from these studies show that the use of phenyl acetate as a solvent, and the concentration and structure of maleimide healing agent has an effect on the physical and chemical bonding across the crack surface.  We used a urea-formaldehyde (UF) encapsulation technique to create capsules with a diameter of ≤ 300 um, containing phenyl acetate-maleimide solutions.  This healing system allowed for multiple healing cycles and increased load recovery. The phenyl acetate-maleimide healing agent and Diels-Alder reactions can similarly be used in the design of self-healing polymer systems for coatings. Specific protective epoxy coatings require a thickness of 30-40 um, thus capsules with an approximate diameter of ≤20um are desired. This can be achieved by increasing shear rate and by incorporating ultrasonication processing to the UF encapsulation procedure. The purpose of this work is to study the effect of capsule size on healing efficiency in thin films that are representative of coatings.

1Pratama, P. A., Sharifi, M., Peterson, A. M., & Palmese, G. R. (2013). Room Temperature Self-Healing Thermoset Based on the Diels–Alder Reaction. ACS applied materials & interfaces, 5(23), 12425-12431.


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