3.1 Smart, Temperature-triggered On-demand Release Catalyst
(Room 237-239)
09 Apr 18
2:00 PM
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2:30 PM
Tracks:
Session 3: Functional and Smart Coatings
Tunable polymers are part of functional and smart materials that respond to multitude of stimuli to provide on-demand functionality. The increase in reaction rates of some chemical reactions in general, is achieved by catalysis. However, in products that require long-term stability, the catalyst must either be added at the point of application or in a protected form that becomes active upon application of external triggering mechanism such as thermal energy. The application of high levels of thermal energy as well as complexity of formulation is not a sustainable process. One approach for achieving reactions and catalysis at lower temperatures is to use catalysts that can be activated on-demand by various external stimuli under mild conditions. In this work we report the preparation, characterization and application of low temperature on-demand release catalyst. The stimuli responsive catalyst was prepared in the form of microcapsules that contained liquid dinonylnaphthalenedisulfonic acid protected by thin Side Chain Crystalline polymeric shell having a distinctive sharp melting point. We have demonstrated that by using stimuli responsive microcapsule technology an acrylic melamine formaldehyde coating can be cured at 50-75OC. This cure temperature is about one-half of the temperature required by blocked catalysts. Additionally, low-temperature cured coatings of this investigation can be viewed as a step forward in development of many other coating systems and those of highly sustainable thermosetting industrial coatings.