New Pure Organic and Peroxide-Free Redox Initiating Systems for Polymerization in Mild Conditions.

Ahmad Arar,Lilian Wisson,Jacques Lalevée

doi:10.3390/polym13020301

Ahmad Arar, Lilian Wisson + Show 1 more

Open Access

https://doi.org/10.3390/polym13020301

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Abstract

Redox initiating systems (RISs) are highly worthwhile for polymerization in mild conditions (at room temperature—RT) without external thermal or light activation. With high performance redox initiating systems RIS, the free radical polymerization FRP can even be carried out under air and without inhibitors/stabilizers removal from the monomers/resins. However, efficient RISs are still based on peroxides or metal complexes. In this work, a pure organic and peroxide-free RIS is presented based on the interaction of a well-selected triarylamine derivative (T4epa) with iodonium salt used as reducing and oxidizing agents, respectively. The redox polymerization (Redox FRP) was followed through pyrometry and thermal imaging experiments. Remarkably, a full control of the work time as well as a high reactivity is observed for mild conditions.

Highlights

For the production of polymers, free radical polymerization (FRP) is a widespread used process [1]
Under mild conditions, alternative systems are not highly efficient [12,13,14,15,16,17,18,19]. This is the reason why we have proposed recently several Redox initiating systems (RISs) based on the dibenzoyl peroxide (BPO)-free for redox FRP [20,21,22,23,24,25,26]
The T4epa/IooseddoRnISiuthmrouhgehxthaeflcuonoternot-s phosphate (Iod) RIS Charactaerized by Optical Pyrometry and Thermal Imaging Experiments

Summary

Introduction

For the production of polymers, free radical polymerization (FRP) is a widespread used process [1]. The benchmark RIS is based on the dibenzoyl peroxide (BPO)/tertiary aromatic amine (e.g., trimethylaniline—TMA) couple This well-established system is already used in many applications for the preparation of biomedical materials, emulsion polymerization, the curing of composites or adhesives, etc. Under mild conditions (room temperature, under air, no stabilizer removal), alternative systems are not highly efficient [12,13,14,15,16,17,18,19] This is the reason why we have proposed recently several RIS BPO-free for redox FRP [20,21,22,23,24,25,26].

Two Cartridges System Used for Redox FRP Experiments

Redox FRP in Bulk Followed by Optical Pyrometry

Results

F EF E D D CC

Discussion