Stable, ‘living’, free-radical copolymers with number-average molecular weights in the range 1250–11,000, prepared by reaction of an excess of perfluoro-2,5-diazahexane-2,5-dioxyl with fluoro-olefins, react, via the terminal nitroxide groups, with fluoro-, sulphur dioxide, or perfluorobuta-1,3-diene to give copolymers of enhanced molecular weights; unsaturated nitroso rubbers prepared by reaction of
通过使过量的
全氟-2,5-二氮杂己烷-2,5-二氧基与
氟代烯烃反应制得的,数均分子量在1250–11,000范围内的稳定的“活性”自由基共聚物,通过末端的氮氧化物基团,与
氟,
二氧化硫或
全氟丁1,3-二烯形成分子量提高的共聚物;通过预
氟代-1,3-二烯与
六氟丙烯和二氧基制备的“活性”共聚物反应制得的不饱和亚硝基橡胶已成功地与“活性”共聚物交联。