Development of a Robust PET-RAFT Polymerization Using Graphitic Carbon Nitride (g-C3N4),Macromolecules

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Development of a Robust PET-RAFT Polymerization Using Graphitic Carbon Nitride (g-C3N4)
Macromolecules ( IF 5.1 ) Pub Date : 2017-09-18 00:00:00 , DOI: 10.1021/acs.macromol.7b01651
Qiang Fu ₁ , Qiushi Ruan ₂ , Thomas G. McKenzie ₁ , Amin Reyhani ₁ , Junwang Tang ₂ , Greg G. Qiao ₁

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The metal-free semiconductor, graphitic carbon nitride (g-C₃N₄), was introduced into RAFT polymerization for the first time. The production of linear polyacrylate and polyacrylamide has been achieved via PET-RAFT polymerization using g-C₃N₄ as a photoactive organocatalyst without prior deoxygenation. The resulting polymers display controlled molecular weights, narrow polymer dispersities, and high end-group fidelity as exemplified by ¹H NMR analysis, MALDI-TOF-MS measurement, and chain extension experiment. Temporal control is illustrated by intermittent light and dark cycles, with polymer growth arrested in the absence of irradiation. The effects of changing RAFT agents (i.e., trithiocarbonates), solvents, catalyst concentrations, and degrees of polymerization in this system have been investigated. The successful polymerization of nonpurified monomer (i.e., still containing radical inhibitors) demonstrates the robust nature of the presented PET-RAFT system.

中文翻译：

用石墨化氮化碳（gC ₃ N ₄）进行稳健的PET-RAFT聚合的开发。

首次将无金属半导体石墨碳氮化物（gC ₃ N ₄）引入RAFT聚合。线性聚丙烯酸酯和聚丙烯酰胺的生产已经通过使用gC ₃ N ₄作为光敏有机催化剂的PET-RAFT聚合完成，而无需事先进行脱氧。所得聚合物显示出受控的分子量，窄的聚合物分散度和较高的端基保真度，例如¹1 H NMR分析，MALDI-TOF-MS测量和扩链实验。时间控制是通过间歇性的明暗循环来说明的，在没有照射的情况下聚合物的生长被阻止。已经研究了在该系统中改变RAFT试剂（即三硫代碳酸盐），溶剂，催化剂浓度和聚合度的影响。未纯化单体（即仍然含有自由基抑制剂）的成功聚合证明了所提出的PET-RAFT系统的稳健性。

更新日期：2017-09-18

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