Aluminum-Based Initiators from Thiols for Epoxide Polymerizations

Aluminum-Based Initiators from Thiols for Epoxide Polymerizations
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用于环氧化物聚合的硫醇铝基引发剂

DOI:
10.1021/acs.macromol.0c00464
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发表时间:
2020
期刊:
影响因子:
5.5
通讯作者:
Ferrier, Robert C.
Ferrier, Robert C.
中科院分区:
化学1区
文献类型:
--
作者:
Safaie, Niloofar;Rawal, Bandana;Ohno, Kohji;Ferrier, Robert C.

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我们提出了一种利用铝基引发剂进行环氧化物聚合的新方法,该方法利用硫醇化合物的化学多功能性来控制聚合物端基。各种环氧化物,如环氧氯丙烷和环氧丙烷的均聚和共聚,证明了引发剂的灵活性。对于所研究的环氧化物,聚合物分子量被控制为高达100 kg/mol,同时保持相对窄的分散度(λ < 1.4)。通过核磁共振氢谱表征了环氧聚合动力学,并研究了引发剂结构对聚合动力学的影响。最后,我们采用我们的引发剂从硫醇末端官能化的聚(甲基丙烯酸甲酯)(PMMA)通过可逆加成断裂链转移(RAFT)聚合,这使我们能够很容易地创建由乙烯基和环氧单体制成的嵌段共聚物合成。因此,这种新的合成工具允许环氧化物容易地聚合成定义明确的功能性聚醚材料。
We present a new method for epoxide polymerizations utilizing aluminum-based initiators, which leverage the chemical versatility of thiol compounds to control the polymer end group. The homo- and co-polymerization of various epoxides, such as epichlorohydrin and propylene oxide, demonstrate the flexibility of the initiators. Polymer molecular weight was controlled up to 100 kg/mol for the epoxides studied while maintaining relatively narrow dispersity (Đ< 1.4). We further characterized the kinetics of epoxide polymerizations through1H NMR spectroscopy and studied how the initiator structure impacted the kinetics. Finally, we employed our initiators to polymerize from thiol end-functionalized poly(methyl methacrylate) (PMMA) synthesized through reversible addition fragmentation chain transfer (RAFT) polymerization, which allows us to easily create block copolymers made from vinyl and epoxide monomers. Therefore, this new synthetic tool allows for the facile polymerization of epoxides into well-defined, functional, polyether materials.
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