One-Pot Synthesis of Brush Copolymers Bearing Stereoregular Helical Polyisocyanides as Side Chains through Tandem Catalysis

One-Pot Synthesis of Brush Copolymers Bearing Stereoregular Helical Polyisocyanides as Side Chains through Tandem Catalysis
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串联催化一锅法合成以立构螺旋多异氰化物为侧链的刷状共聚物

DOI:
10.1021/ma502283f
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发表时间:
2015-01
期刊:
影响因子:
5.5
通讯作者:
Zong-Quan Wu
Zong-Quan Wu
中科院分区:
化学1区
文献类型:
--
作者:
Na Liu;Jun Yin;Yuan-Yuan Zhu;Zong-Quan Wu

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设计并合成了一种含可聚合环己烯单元的苯乙炔基钯配合物。这种Pd(II)配合物可以引发苯基异腈的活性/可控聚合,以高产率得到具有可控分子量和窄分子量分布的立构规整聚(苯基异腈)。Pd(II)配合物上的异戊二烯单元可以在Grubbs的第二代催化剂下进行开环易位聚合(ROMP),以活性/可控的方式提供带有Pd(II)配合物侧基的聚异戊二烯。有趣的是,Pd(II)配合物的悬垂物上的孤立的聚异戊二烯是足够的活性,以引发活性/可控的聚合苯基异腈,产生明确定义的刷状共聚物与聚异戊二烯主链和螺旋聚(苯基异腈)作为侧链。~(31)P NMR分析表明,聚异戊二烯上几乎所有的Pd(II)单元都参与了聚合反应,刷状结构的接枝密度随聚合时间的延长而增大。
An air-stable phenylethynyl Pd(II) complex containing a polymerizable norbornene unit was designed and synthesized. Such a Pd(II) complex can initiate the living/controlled polymerization of phenyl isocyanide, giving stereoregular poly(phenyl isocyanide)s in high yields with controlled molecular weights and narrow molecular weight distributions. The norbornene unit on the Pd(II) complex can undergo ring-opening metathesis polymerization (ROMP) with Grubbs’ second-generation catalyst, affording polynorbornene bearing Pd(II) complex pendants under a living/controlled manner. Interestingly, the Pd(II) complex pendants on the isolated polynorbornene are active enough to initiate the living/controlled polymerization of phenyl isocyanides, yielding well-defined brush-like copolymers with polynorbornene backbone and helical poly(phenyl isocyanide) as side chains. 31P NMR analyses indicate almost all the Pd(II) units on the polynorbornene participated in the polymerization, and the grafting density of the brush c...
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