Herein, we report the development of a photoredox-initiated frontal ring-opening metathesis polymerization (FROMP) chemical system. We found that a ruthenium-based, bis-N-heterocyclic carbene metathesis precatalyst was activated with 9-mesityl-10-phenylacridindium tetrafluoroborate, copper(II) triflate, and a 455 nm light source. This chemistry was used to initiate the FROMP of dicyclopentadiene; once initiated, the heat released from the polymerization sustained a well-controlled reaction front. Variation in copper or metathesis precatalyst loading yielded front speeds ranging from 0.15 to 0.43 mm s^–1 and front temperatures ranging from 140 to 205 °C. While the glass transition temperatures of the resultant polymers are lower than those derived with Grubbs’ second-generation catalyst, this chemical system provides extended pot life.

中文翻译：

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光氧化还原引发的正面开环复分解聚合

在此，我们报告了光氧化还原引发的正面开环复分解聚合 (FROMP) 化学系统的发展。我们发现，一种基于钌的双-N-杂环卡宾复分解预催化剂被 9-mesityl-10-苯基吖啶四氟硼酸、三氟甲磺酸铜 (II) 和 455 nm 光源活化。该化学物质用于引发二环戊二烯的 FROM；一旦开始，聚合释放的热量就会维持一个良好控制的反应前沿。铜或复分解预催化剂负载的变化产生的前沿速度范围为 0.15 至 0.43 mm s ^–1前部温度范围为 140 至 205 °C。虽然所得聚合物的玻璃化转变温度低于使用 Grubbs 的第二代催化剂衍生的那些，但这种化学系统提供了更长的适用期。