Abstract
The stable free radical polymerizations of styrene were investigated with five 4-sulphonate-2,2,6,6-tetramethylpiperidine-N-oxyl stable radicals as mediators and benzoyl peroxide (BPO) as initiators at 125 °C. The results indicated that the polymerizations proceeded in a “living”/controlled manner, i.e., the polymerization rates were first-order with respect to the monomer concentrations, molecular weights increased linearly with conversions and the molecular weight distributions were relatively low (M w/M n = 1.2–1.4), 1H NMR analysis of the polymer chain-ends and successful chain extensions. The polymerization rates were faster than that of 4-hydroxyl-2,2,6,6-tetramethylpiperidine-N-oxyl (OH-TEMPO) mediated ones. The effects of steric interference of different substitute groups at four-position of 2,2,6,6-tetramethylpiperidine-N-oxyl (TEMPO), the molar ratios of stable radical to BPO and the temperature on the polymerizations were investigated.
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Acknowledgments
The financial support to this work from the National Nature Science Foundation of China (No. 20874069 and 50803044), the Science and Technology Development Planning of Jiangsu Province (No. BK2007702 and BK2007048), the International Cooperation Foundation of Jiangsu Province (No. BZ2007037), the Nature Science Key Basic Research of Jiangsu Province for Higher Education (No. 05KJA15008), and the Qing Lan Project are gratefully acknowledged.
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Li, J., Zhang, Z., Zhu, X. et al. Stable free radical polymerization of styrene with 4-sulphonate-2,2,6,6-tetramethylpiperidine-N-oxyl as mediators. Polym. Bull. 64, 1–13 (2010). https://doi.org/10.1007/s00289-009-0125-0
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DOI: https://doi.org/10.1007/s00289-009-0125-0