Runge M Brett, Yoo Jun, Bowden Ned B
Department of Chemistry, University of Iowa, Iowa City IA, 52242, USA.
Macromol Rapid Commun. 2009 Aug 18;30(16):1392-8. doi: 10.1002/marc.200900146. Epub 2009 Jun 15.
High molecular weight tri- and tetrablock copolymers were synthesized from the commercially available Grubbs first generation catalyst for the first time. These polymers had degrees of polymerization from 430 to 1 100, molecular weights up to 419 000 g · mol(-1) , and narrow polydispersities. Oxanorbornene monomers were chosen due to their fast rates of polymerization and slow rates of cross metathesis. Polystyrene arms were grown from selected blocks by atom transfer radical polymerization to yield architecturally complex comb tri- and tetrablock copolymers. These polymers self-assembled in the solid state into ordered morphologies that were characterized by scanning electron microscopy.
首次使用市售的第一代格拉布催化剂合成了高分子量的三嵌段和四嵌段共聚物。这些聚合物的聚合度为430至1100，分子量高达419000 g·mol⁻¹，且具有窄的多分散性。选择氧化降冰片烯单体是因为它们的聚合速率快且交叉复分解速率慢。通过原子转移自由基聚合在选定的嵌段上生长聚苯乙烯臂，以得到结构复杂的梳状三嵌段和四嵌段共聚物。这些聚合物在固态下自组装成有序形态，通过扫描电子显微镜对其进行表征。
