Dependence of O2 Depletion on Transition Metal Catalyst in Radical Polymerization of Cross-Linking Alkene Resins
Hugo den Besten, Yanrong Zhang, Linda E. Eijsink, Andy S. Sardjan, Anouk Volker, Wesley R. Browne
TL;DR
This study compares how different metal catalysts affect oxygen depletion during the polymerization of cross-linking alkene resins.
Contribution
The study introduces a method using O2-sensitive spectroscopy to compare the O2 depletion rates of cobalt, iron, and manganese catalysts in resin curing.
Findings
The rate of O2 depletion varies significantly depending on the catalyst used.
O2 is depleted before the autoacceleration phase of polymerization begins in all cases.
Cobalt(II), iron(II), and manganese(II) catalysts show distinct behaviors in O2 consumption.
Abstract
Cobalt(II) carboxylates show broad reactivity with peroxides and O2 and are the industry standard catalyst for the activation of peroxide initiators for the radical polymerization of alkenes under ambient conditions. Curing alkene-based resins containing cross-linking units, i.e., monomers containing two or more alkene units, is important in forming hard protective coatings and materials. The activation of peroxide initiators produces the propagating chain end radicals needed for polymerization. Since polymerization progress depends on the rate of initiator activation and the concentration of propagating radicals, interception of radicals by O2 can inhibit curing. Cobalt(II) carboxylates are used due to their reactivity in the presence of oxygen, even in resin coatings. Alternative catalysts based on manganese and iron are desirable. Hence, the impact of O2 on their performance in resin…
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Taxonomy
TopicsAdvanced Polymer Synthesis and Characterization · Organometallic Complex Synthesis and Catalysis · Photopolymerization techniques and applications