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Investigation of redox initiators for free radical frontal polymerization
Authors:Huan Yu  Yuan Fang  Li Chen  Su Chen
Affiliation:State Key Laboratory of Material‐Oriented Chemical Engineering and College of Chemistry and Chemical Engineering, Nanjing University of Technology, 5 Xin Mofan Road, Nanjing 210009, PR China
Abstract:BACKGROUND: The reaction temperature for frontal polymerization (FP) initiated by redox initiators can be greatly decreased compared with FP initiated by peroxide initiator and disulfide initiator. We report the synthesis of poly(hydroxyethyl acrylate)s via free radical FP using benzoyl peroxide (BPO)/N,N‐dimethylaniline (DMA) and ammonium persulfate (APS)/N,N,N′,N′‐tetramethylethylenediamine (TMEDA) couples as redox initiators at ambient pressure. RESULTS: The results show that unlike the phenomenon of bubbles and ‘fingers’ when using BPO alone, a self‐sustaining and stable front can be obtained when the DMA]/BPO] ratio is higher than 1 (mol/mol). A slight increase of the DMA (or TMEDA) reductant concentration causes a marked decrease of front temperature to 53 °C (or 61 °C). CONCLUSION: We investigated the effects of the ratio of the oxidant to the reductant and the initiator and monomer concentrations on certain parameters of FP: formation of bubbles, front velocity and front temperature. This opens the way to the potential development of FP using more appropriate monomers with low boiling points. Copyright © 2009 Society of Chemical Industry
Keywords:redox initiators  frontal polymerization (FP)  hydroxyethyl acrylate (HEA)  propagating fronts  infrared thermal image
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