Synthesis of Star Polymers using Organocatalyzed Atom Transfer Radical Polymerization Through a Core-first Approach.
Synthesis of Star Polymers using Organocatalyzed Atom Transfer Radical Polymerization Through a Core-first Approach.
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DOI：
10.1039/c7py01833a
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发表时间：
2018
影响因子：
4.6
通讯作者：
Miyake GM
中科院分区：
文献类型：
--
作者：
Buss BL;Beck LR;Miyake GM
高分子有序结构的合成路线是先进材料设计和实现的重要工具。本研究以3，7-二（4-联苯基）-1-萘-10-吩恶嗪为光催化剂，采用原子转移自由基聚合的方法，通过核优先的方法合成了星星型聚合物。具有2、3、4、6或8个引发位点的结构相似的多官能引发剂在本研究中用于合成通常具有低于1.5的分散度的线性遥爪聚合物和星星聚合物，同时实现高引发剂效率。此外，即使在高单体转化率和高聚合度下，也没有观察到不期望的星-星偶联反应的证据。该系统的实用性进一步通过合成定义明确的二嵌段星星聚合物来举例说明。利用可见光诱导的有机催化原子转移自由基聚合反应，通过核优先的方法合成了含有3-8个臂的星星聚合物和线性遥爪聚合物。
Synthetic routes to higher ordered polymeric architectures are important tools for advanced materials design and realization. In this study, organocatalyzed atom transfer radical polymerization is employed for the synthesis of star polymers through a core-first approach using a visible-light absorbing photocatalyst, 3,7-di(4-biphenyl)-1-naphthalene-10-phenoxazine. Structurally similar multifunctional initiators possessing 2, 3, 4, 6, or 8 initiating sites were used in this study for the synthesis of linear telechelic polymers and star polymers typically possessing dispersities lower than 1.5 while achieving high initiator efficiencies. Furthermore, no evidence of undesirable star-star coupling reactions was observed, even at high monomer conversions and high degrees of polymerization. The utility of this system is further exemplified through the synthesis of well-defined diblock star polymers. Star polymers containing 3-8 arms and a linear telechelic polymer are synthesized from a core-first approach using visible-light induced organocatalyzed atom transfer radical polymerization.