Dattatray Namdev Sutar, Sandip Prabhakar Shelake, Nagamalleswara Rao Indla, Sagar Varangane, Annadanam V. Sesha Sainath, Ujjwal Pal
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引用次数: 0
摘要
本报告合成了一系列聚苯乙烯分段的新型糖聚合物结构,并将其用于光转化过程,以实现显著的制氢率。在 RAFT 聚合过程中,采用苯乙烯和乙酰化甲基丙烯酸葡萄糖单体,以单功能、双功能和四功能光增感剂为主要构件,设计出一系列嵌段共聚物结构。与去乙酰化聚合物相比,乙酰化聚合物结构具有更高的热稳定性。脱乙酰化聚合物的 T 值低于乙酰化聚合物。此外,乙酰化聚合物的 T 值范围很宽(55-96 °C),而且 T 值也各不相同,这表明其取决于悬垂单元和大分子结构的性质。与单独的聚苯乙烯段(53 μmol/g/h,AQY ∼0.02%)相比,去乙酰化大分子 1A-PS-PGM 二嵌段共聚物的氢气生成率为 ∼753 μmol/g/h,AQY ∼1.84%。在可能合成的聚糖结构范围内,线性聚糖和基于葡萄糖的三嵌段聚糖显示出良好的活性。调节溶液的 pH 值和糖分子链的亲水性都会影响分水反应的动力学。
Visible light-driven photoreforming of polystyrene segmented glycopolymer architectures for enhanced hydrogen generation
In this report, a series of polystyrene segmented new glycopolymer architectures are synthesized, which are utilized in the photoreforming process to achieve a remarkable rate of hydrogen production. The primary building blocks of mono-, bi-, and tetra-functional photo-iniferter were employed in the RAFT polymerization process to design a series of block copolymer architectures using styrene and acetylated glucose methacrylate monomers. Acetylated polymer architectures exhibited higher thermal stability compared to deacetylated polymers. Deacetylated polymers showed lower T values than the acetylated polymers. In addition, a wide range of T values (55–96 °C) and variations in the T values of the acetylated polymers indicate the dependence on the nature of the pendant unit and macromolecular architecture. The deacetylated macromolecule, 1A-PS--PGM diblock copolymer exhibits a hydrogen generation rate of ∼753 μmol/g/h with an AQY of ∼1.84% compared to that of the polystyrene segment alone (53 μmol/g/h, AQY of ∼0.02%). Within the range of possible synthesized glycopolymer architectures, linear and glucose-based triblock glycopolymers show promising activity. The kinetics of the water-splitting reaction are influenced by adjustments to both the solution's pH and the hydrophilicity of the glycomacromolecular chains.
期刊介绍:
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