The influence of monomer chemistry on radical formation and secondary reactions during electron‐beam polymerization
The influence of monomer chemistry on radical formation and secondary reactions during electron‐beam polymerization
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电子束聚合过程中单体化学对自由基形成和副反应的影响
DOI:
10.1002/pol.20190113
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发表时间:
2020
影响因子:
3.4
通讯作者:
Jessop, Julie L.
中科院分区:
文献类型:
--
作者:
Thiher, Nicole L.;Schissel, Sage M.;Jessop, Julie L.
The vast majority of industrial electron‐beam (EB) polymerizations are initiatedviaradical mechanism. Because radicals drive EB polymerization, understanding their formation and secondary reactions can provide insight into polymerization kinetics and property development. Primary and initiating radicals were quantified by measuringG(R•) andG(M•), respectively, for various acrylate and methacrylate monomers. Monomer chemistry was shown to impact primary radical formation; however, increased primary radical concentration did not necessarily correlate to increased conversion. Despite exhibiting high values ofG(R•), methacrylates achieved very little conversion and hadG(M•) values near zero. Acrylates achieved much higherG(M•) values and rates of polymerization compared to their methacrylate counterparts. Additionally, the efficiency of primary radicals converting to initiating radicals,f(M•), for each acrylate monomer was shown to be a good predictor of the amount of gel fraction formed during polymerization. Understanding radical formation and secondary radical reactions can help guide the structure/processing conditions/properties relationships that are currently underdeveloped for EB reactions.
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DOI:
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