Kim Dong-Gyun, Bell Andrew, Register Richard A
Department of Chemical and Biological Engineering, Princeton University, Princeton, New Jersey 08544, United States.
Promerus, LLC, 9921 Brecksville Road, Brecksville, Ohio 44141, United States.
ACS Macro Lett. 2015 Mar 17;4(3):327-330. doi: 10.1021/acsmacrolett.5b00079. Epub 2015 Mar 2.
The vinyl addition polymerization of substituted norbornene (NB) monomers, via (-BuP)PdMeCl activated by [Li(OEt)]B(CF), is investigated. NB monomers bearing alkyl, aryl, fluoroaryl, and even hexafluoroisopropanol substituents yield polymers exhibiting monomodal and narrow molecular weight distributions, with molecular weight controlled by reaction time and monomer to initiator ratio, demonstrating the living nature of these polymerizations. These polymers are soluble in common organic solvents and possess excellent thermal stability. Block copolymers are also prepared via sequential monomer addition; these are the first examples of well-defined block copolymers of substituted NB monomers enchained by vinyl addition polymerization.
研究了通过[Li(OEt)]B(CF)活化的(-BuP)PdMeCl引发的取代降冰片烯（NB）单体的乙烯基加成聚合反应。带有烷基、芳基、氟芳基甚至六氟异丙醇取代基的NB单体生成的聚合物具有单峰且窄的分子量分布，其分子量可通过反应时间和单体与引发剂的比例来控制，这证明了这些聚合反应具有活性。这些聚合物可溶于常见有机溶剂，并具有优异的热稳定性。还通过依次加入单体制备了嵌段共聚物；这些是通过乙烯基加成聚合连接的取代NB单体的明确嵌段共聚物的首个实例。
