Poly(N-acryloylglycinamide) microgels as nanocatalyst platform†,Polymer Chemistry

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Poly(N-acryloylglycinamide) microgels as nanocatalyst platform†
Polymer Chemistry ( IF 4.1 ) Pub Date : 2018-01-02 00:00:00 , DOI: 10.1039/c7py01950e
Dong Yang _{1,

2,

3,

4} , Milla Viitasuo _{1,

2,

3,

4} , Fabian Pooch _{1,

2,

3,

4} , Heikki Tenhu _{1,

2,

3,

4} , Sami Hietala _{1,

2,

3,

4}

Affiliation

We report the synthesis of thermophilic poly(N-acryloylglycinamide) (PNAGA) microgels that swell in water upon heating and their use as nanocatalyst hosts. The microgels are prepared by aqueous precipitation polymerization below the UCST phase transition temperature of PNAGA. The diameters of the PNAGA microgels are around 60 nm in cold water and they show reversible swelling and shrinking upon change of temperature. Silver nanoparticle (AgNP) loaded microgels were prepared by reduction of AgNO₃ and their catalytic activity in 4-nitrophenol reduction was tested under different conditions. The thermophilic behaviour of the PNAGA microgels was retained after nanocatalyst synthesis and the catalytic activity in 4-nitrophenol reduction by AgNPs increased especially at temperatures above 30 °C. Furthermore, it was shown that the catalytic activity of the thermosensitive AgNP–PNAGA microgels could be switched on and off by changing the temperature.

中文翻译：

聚（N-丙烯酰基甘氨酰胺）微凝胶作为纳米催化剂平台†

我们报告了加热时在水中溶胀的嗜热聚（N-丙烯酰基甘氨酰胺）（PNAGA）微凝胶的合成及其作为纳米催化剂主体的用途。通过在PNAGA的UCST相变温度以下进行水相沉淀聚合来制备微凝胶。PNAGA微凝胶的直径在冷水中约为60 nm，在温度变化时会显示可逆的溶胀和收缩。通过还原AgNO ₃制备负载银纳米颗粒（AgNP）的微凝胶在不同条件下测试了它们在4-硝基苯酚还原反应中的催化活性。纳米催化剂合成后，PNAGA微凝胶的嗜热行为得以保留，尤其是在高于30°C的温度下，AgNPs还原4-硝基苯酚的催化活性增加。此外，结果表明，可以通过改变温度来开启和关闭热敏性AgNP–PNAGA微凝胶的催化活性。

更新日期：2018-01-02

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