Microwave-promoted continuous flow synthesis of thermoplastic polyurethane–silver nanocomposites and their antimicrobial performance,Reaction Chemistry & Engineering

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Microwave-promoted continuous flow synthesis of thermoplastic polyurethane–silver nanocomposites and their antimicrobial performance
Reaction Chemistry & Engineering ( IF 3.4 ) Pub Date : 2022-05-19 , DOI: 10.1039/d2re00049k
Qandeel Saleem ₁ , Milad Torabfam ₁ , Hasan Kurt _{2,

3,

4} , Meral Yüce _{1,

5} , Mustafa Kemal Bayazit _{1,

5}

Affiliation

Thermoplastic polyurethane–silver nanocomposites (PU–Ag NCs) have considerable potential in many medical applications due to their superior mechanical and antimicrobial properties. Herein, a microwave-promoted flow system is successfully employed for continuous in situ manufacturing of PU NCs having spherical silver nanoparticles (AgNPs) without any reducing agent at ∼40 °C in approximately 4 minutes. The main experimental parameters, including microwave power, metal salt concentration, polymer concentration, and flow rate, are optimised for the reproducible synthesis of AgNPs (∼5 nm) in the PU matrix, characterised by HRTEM-EDS and DLS analysis. XRD patterns indicate an increase in PU crystallinity with decreased particle size. Conventional heating flow synthesis at ∼50 °C or microwave-batch synthesis (MWB) at ∼44 and ∼50 °C is ineffective in preparing AgNPs, and only large AgNPs (>100 nm) are synthesised at 70 °C in the MWB reactor. PU–Ag NC films bearing small AgNPs (∼5 nm) exhibit superior antibacterial activity (>97%) against Escherichia coli, Pseudomonas aeruginosa, and Staphylococcus aureus compared to large NPs (∼218 nm). The proposed method may manufacture other metal–polymer matrix composites.

中文翻译：

微波促进热塑性聚氨酯-银纳米复合材料的连续流动合成及其抗菌性能

热塑性聚氨酯-银纳米复合材料（PU-Ag NCs）由于其卓越的机械和抗菌性能，在许多医疗应用中具有相当大的潜力。在此，微波促进流动系统成功地用于连续原位在约 40°C 下，在大约 4 分钟内制造具有球形银纳米颗粒 (AgNPs) 的 PU NC，无需任何还原剂。主要实验参数，包括微波功率、金属盐浓度、聚合物浓度和流速，针对在 PU 基质中可重复合成 AgNPs（~5 nm）进行了优化，通过 HRTEM-EDS 和 DLS 分析进行表征。XRD 图案表明 PU 结晶度随着粒径的减小而增加。在~50°C 的常规加热流合成或~44 和~50°C 的微波分批合成 (MWB) 在制备 AgNPs 时无效，并且在 MWB 反应器中在 70°C 下仅合成大的 AgNPs (>100 nm) . PU-Ag NC 薄膜带有小的 AgNPs (~5 nm) 对大肠杆菌表现出优异的抗菌活性 (>97%) ，铜绿假单胞菌和金黄色葡萄球菌与大型 NP（~218 nm）相比。所提出的方法可以制造其他金属-聚合物基复合材料。

更新日期：2022-05-19

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