Buss Bonnie L, Beck Logan R, Miyake Garret M
Department of Chemistry, Colorado State University, Fort Collins, CO.
Department of Chemistry and Biochemistry, University of Colorado Boulder, Boulder, CO.
Polym Chem. 2018;9(13):1658-1665. doi: 10.1039/C7PY01833A. Epub 2017 Dec 6.
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.
通往更高有序聚合物结构的合成路线是先进材料设计与实现的重要工具。在本研究中，有机催化原子转移自由基聚合通过使用一种可见光吸收光催化剂3,7-二（4-联苯基）-1-萘-10-吩恶嗪的核心优先方法用于合成星形聚合物。本研究中使用了具有2、3、4、6或8个引发位点的结构相似的多功能引发剂来合成线性遥爪聚合物和星形聚合物，这些聚合物通常具有低于1.5的分散度，同时实现了高引发剂效率。此外，即使在高单体转化率和高聚合度下，也未观察到不良的星-星偶联反应的证据。通过合成明确的二嵌段星形聚合物进一步例证了该体系的实用性。
