Perylene as a visible light photoredox catalyst for photoinduced electron transfer-reversible addition-fragmentation chain transfer (PET-RAFT) polymerization of MMA. Issue 8 (3rd August 2018)

• Record Type: Journal Article
• Authors: He, Bin-Hong; Lu, Mang; Yang, Cai-Xia; Liu, Yu; Liang, Enxiang; Wang, Guo-Xiang
• Is Part Of: Journal of macromolecular science. Volume 55:Issue 8(2018)
• Page Start: 583
• Page End: 587
• Publication Date: 2018-08-03
• Subjects: Perylene -- controlled/'living' photoradical polymerization -- photoelectron transfer -- reversible addition-fragmentation chain transfer -- photocatalyst; Polymers -- Periodicals; Polymerization -- Periodicals; 547.7
• DOI: 10.1080/10601325.2018.1476825
• Languages: English
• ISSNs: 1060-1325

Abstract

Abstract: The organic photocatalyst, perylene, was used to mediate photoinduced electron transfer (PET) reversible addition-fragmentation chain transfer polymerization (RAFT) of methyl methhacrylate (MMA) under light irradiation in N, N-dimethylformamide (DMF) at 25°C with 4-cyanopentanoic acid dithiobenzoate (CPADB) as chain transfer agent (CTA). Kinetic studies confirmed that the polymerization obeyed the first order kinetic m'odel. The production of PMMAs with a good control of molecular weights (Mn, GPC ) and narrow polymer molecular weight distribution (Mw /Mn ) were obtained. It is found that well-controlled PET RAFT polymerization of MMA can be manipulated even with the amount of perylene decreasing to ppm level. No polymer was obtained in the absence of light irradiation, implying that the model of PET RAFT polymerization of MMA is an ideal light "on"-"off" switchable system. Furthermore, the speed of PET RAFT polymerization of MMA was also finely tunable by the external light irradiation intensity. The resultant PMMA macro-CTA was characterized by 1 H nuclear magnetic resonance spectrum ( 1 H NMR) and gel permeation chromatography (GPC). The accessibility of the high end group fidelity was further demonstrated by chain extension experiments.