Schuett Timo, Wejner Manuel, Kimmig Julian, Zechel Stefan, Wilke Timm, Schubert Ulrich S
Laboratory of Organic and Macromolecular Chemistry (IOMC), Friedrich Schiller University Jena, Humboldtstr. 10, 07743 Jena, Germany.
Jena Center of Soft Matter (JCSM), Friedrich Schiller University Jena, Philosophenweg 7, 07743 Jena, Germany.
Polymers (Basel). 2022 Jan 18;14(3):361. doi: 10.3390/polym14030361.
A small, low-cost, self-produced photometer is implemented into a synthesis robot and combined with a modified UV chamber to enable automated sampling and online characterization. In order to show the usability of the new approach, two different reversible addition-fragmentation chain transfer (RAFT) polymers were irradiated with UV light. Automated sampling and subsequent characterization revealed different reaction kinetics depending on polymer type. Thus, a long initiation time (20 min) is required for the end-group degradation of poly(ethylene glycol) ether methyl methacrylate (poly(PEGMEMA)), whereas poly(methyl methacrylate) (PMMA) is immediately converted. Lastly, all photometric samples are characterized via size-exclusion chromatography using UV and RI detectors to prove the results of the self-produced sensor and to investigate the molar mass shift during the reaction.
一种小型、低成本的自制光度计被集成到合成机器人中，并与一个经过改进的紫外线腔室相结合，以实现自动采样和在线表征。为了展示这种新方法的实用性，用紫外线照射了两种不同的可逆加成-断裂链转移（RAFT）聚合物。自动采样和随后的表征显示，根据聚合物类型的不同，反应动力学也不同。因此，聚（乙二醇）醚甲基丙烯酸甲酯（聚（PEGMEMA））的端基降解需要较长的引发时间（20分钟），而聚（甲基丙烯酸甲酯）（PMMA）则会立即发生转化。最后，所有的光度样品通过尺寸排阻色谱法，使用紫外和示差折光检测器进行表征，以验证自制传感器的结果，并研究反应过程中的摩尔质量变化。
