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Photocontrolled Iodine-Mediated Reversible-Deactivation Radical Polymerization System: Solution Polymerization of Methacrylates by Irradiation with NIR LED Light.
Angewandte Chemie International Edition ( IF 16.1 ) Pub Date : 2019-12-27 , DOI: 10.1002/anie.201914835
Chun Tian 1 , Peng Wang 1 , Yuanyuan Ni 1 , Lifen Zhang 1 , Zhenping Cheng 1 , Xiulin Zhu 1
Affiliation  

Herein, near-infrared (NIR) photocontrolled iodide-mediated reversible-deactivation radical polymerization (RDRP) of methacrylates, without an external photocatalyst, was developed using an alkyl iodide (e.g., 2-iodo-2-methylpropionitrile) as the initiator at room temperature. This example is the first use of a series of special solvents containing carbonyl groups (e.g., 1,3-dimethyl-2-imidazolidinone) as both solvent and catalyst for photocontrolled RDRP using long-wavelength (λmax =730 nm) irradiation. The polymerization system comprises monomer, alkyl iodide initiator, and solvent. Well-defined polymers were synthesized with excellent control over the molecular weights and molecular weight distributions (Mw /Mn <1.21). The living features of this system were confirmed by polymerization kinetics, multiple controlled "on-off" light switching cycles, and chain extension experiments. Importantly, the polymerizations proceeded successfully with various barriers (pork skin and A4 paper), demonstrating the advantage of high-penetration NIR light.

中文翻译:

光控碘介导的可逆失活自由基聚合系统:通过近红外LED灯辐照进行甲基丙烯酸酯的溶液聚合。

在此,在室温下使用烷基碘化物(例如2-碘-2-甲基丙腈)作为引发剂,开发了无外部光催化剂的甲基丙烯酸酯的近红外(NIR)光控碘化物介导的可逆失活自由基聚合(RDRP)。温度。该实例是首次使用一系列含有羰基的特殊溶剂(例如1,3-二甲基-2-咪唑啉酮)作为溶剂和催化剂,用于长波长(λmax= 730 nm)照射的光控RDRP。聚合体系包含单体,烷基碘引发剂和溶剂。合成了定义明确的聚合物,可以很好地控制分子量和分子量分布(Mw / Mn <1.21)。该体系的活性特征通过聚合动力学,多重控制的“开-关”得到证实。轻切换周期和扩链实验。重要的是,聚合反应在各种阻隔层(猪皮和A4纸)上成功进行,这证明了高穿透性近红外光的优势。
更新日期:2020-01-23
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