原位多重光学监测的本体聚合

In situ Multiple Optical Monitoring of Bulk Polymerization

摘要

光学可视化是一种高灵敏度、 非侵入且简便的原位监测本体聚合过程的方法. 本文合成了一种基于9,14-二苯基-9,14-二氢二苯并[a,c]吩嗪（DPAC）的分子, 利用其在不同微环境下独特的激发态构象响应能够监测体系内的微观动态变化. 在甲基丙烯酸甲酯（MMA）聚合过程中, 体系从液态单体逐渐转变为固态聚合物. 伴随这一过程, DPAC的荧光从红色转变为蓝色, 反映了局部黏度增加与分子运动受限; 随后, 磷光逐渐增强且寿命延长, 表明聚合物网络刚性逐步上升. 通过基于比率荧光与磷光的双通道监测, 该策略实现了本体聚合过程的可视化追踪.

Abstract

Optical visualization provides a highly sensitive， non-invasive， and straightforward approach for the in situ monitoring of bulk polymerization processes. This paper synthesized a 9，14-diphenyl-9，14-dihydrodibenzo［a，c］phenazine（DPAC）-based molecule， whose distinct excited-state conformational responses under different micro- environments enabled the monitoring of microscopic dynamic changes within the system. During the polymerization of methyl methacrylate（MMA）， the system transfer from a liquid monomer to a solid polymer. Accompanying this process， the fluorescence of DPAC shifts from red to blue， reflecting the increase in local viscosity and the restriction of molecular motion. Subsequently， the gradual enhancement of phosphorescence and the extension of its lifetime indicate the rising rigidity of the polymer network. Through dual-channel monitoring based on ratio-metric fluorescence and phosphorescence， this strategy makes the visual tracking of bulk polymerization feasible.

关键词

原位监测 / 本体聚合 / 振动诱导发光

Key words

In situ monitoring / Bulk polymerization / Vibration-induced emission