Phase Transition Behavior and Catalytic Activity of Poly(N-acryloylglycinamide-co-methacrylic acid) Microgels,Langmuir

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Phase Transition Behavior and Catalytic Activity of Poly(N-acryloylglycinamide-co-methacrylic acid) Microgels
Langmuir ( IF 3.7 ) Pub Date : 2021-02-17 , DOI: 10.1021/acs.langmuir.0c03264
Dong Yang ₁ , Heli Eronen ₁ , Heikki Tenhu ₁ , Sami Hietala ₁

Affiliation

Poly(N-acryloyl glycinamide) is a well-known thermoresponsive polymer possessing an upper critical solution temperature (UCST) in water. By copolymerizing N-acryloyl glycinamide (NAGA) with methacrylic acid (MAA) in the presence of a crosslinker, poly(N-acryloyl glycinamide-co-methacrylic acid) [P(NAGA–MAA)] copolymer microgels with an MAA molar fraction of 10–70 mol % were obtained. The polymerization kinetics suggests that the copolymer microgels have a random structure. The size of the microgels was between 60 and 120 nm in the non-aggregated swollen state in aqueous medium and depending on the solvent conditions, they show reversible swelling and shrinking upon temperature change. Their phase transition behavior was studied by a combination of methods to understand the process of the UCST-type behavior and interactions between NAGA and MAA. P(NAGA–MAA) microgels were loaded with silver nanoparticles (AgNPs) by the reduction of AgNO₃ under UV light. Compared with the chemical reduction of AgNO₃, the photoreduction results in smaller AgNPs and the amount and size of the AgNPs are dependent on the comonomer ratio. The catalytic activity of the AgNP-loaded microgels in 4-nitrophenol reduction was tested.

中文翻译：

聚（N-丙烯酰基甘氨酰胺-共-甲基丙烯酸）微凝胶的相变行为和催化活性

聚（N-丙烯酰基甘氨酰胺）是一种众所周知的热响应聚合物，在水中具有较高的临界溶液温度（UCST）。通过在交联剂的存在下使N-丙烯酰基甘氨酰胺（NAGA）与甲基丙烯酸（MAA）共聚，聚（N-丙烯酰基甘氨酰胺-co获得了甲基丙烯酸（MAA摩尔分数为10-70摩尔％）的[P（NAGA–MAA）]共聚物微凝胶。聚合动力学表明共聚物微凝胶具有无规结构。在水性介质中的非聚集溶胀状态下，微凝胶的大小在60至120 nm之间，并且取决于溶剂条件，它们在温度变化时表现出可逆的溶胀和收缩。通过相结合的方法研究了它们的相变行为，以了解UCST型行为的过程以及NAGA和MAA之间的相互作用。P（NAGA–MAA）微凝胶通过在紫外线下还原AgNO ₃来装载银纳米颗粒（AgNPs）。与化学还原AgNO _3相比，光还原导致较小的AgNPs，AgNPs的数量和大小取决于共聚单体的比例。测试了负载AgNP的微凝胶在4-硝基苯酚还原中的催化活性。

更新日期：2021-03-02

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