1,3,5,5‐tetraphenyl‐Δ3‐1,2,4‐triazolin‐2‐yl radical–properties in the controlled radical polymerization of poly(methyl methacrylate) and polystyrene

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The triazoline derivative 1 was used as an additive in the chain‐growth controlled radical polymerization of vinylic monomers to afford narrowly distributed polymers. This new system is applicable to styrene as well as to methacrylates. The monomer consumption and the variation of the molar mass were monitored with time. Thermal properties of the obtained polymers were also studied. After isolation of the polymers, the growth of the chains was re‐initiated in the presence of a second monomer and yielded block copolymers.