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Effect of sizes of vinyl modified narrow-dispersed silica cross-linker on the mechanical properties of acrylamide based hydrogel
Scientific Reports ( IF 3.8 ) Pub Date : 2023-03-29 , DOI: 10.1038/s41598-023-32185-4
Md Rezaul Karim 1, 2 , Mohammad Harun-Ur-Rashid 3 , Abu Bin Imran 1
Affiliation  

Polymeric hydrogel with the incorporation of nano to submicro-meter sized materials forms an exhilarating new generation of composite hydrogels. Most of the applications of hydrogels are in aqueous environments in which they swell to a very high degree. This emanates from low density of the polymer chains, making them highly inferior in terms of physical strength and their prospective applications. In order to address the weak mechanical properties, hydrogels have successfully prepared with high tensile strength and toughness by reinforcing the acrylamide (AAm) network with 3-methacryloxypropyltrimethoxysilane (MPTS) modified silica particles (MSiO2) as chemical cross-linker. The MSiO2 cross-linkers are prepared from narrow-dispersed silica particles (SiO2) of 100 nm, 200 nm, and 300 nm diameters to investigate the effect of cross-linker sizes on the mechanical strengths of hydrogels. The presence of MSiO2 remarkably increases the stretching ability and toughness of hydrogels compared to conventional hydrogels. The tensile strength, toughness, and Young’s modulus of the hydrogel decrease from 30 to 11 kPa, 409 to 231 kJ/m3, and 0.16 to 0.11 kPa, respectively, while the SiO2 particle size increase from 100 to 300 nm and the concentration of AAm and MSiO2 (%) are kept constant. The compressive strength and toughness of the hydrogel decrease from 34 to 18 kPa and 6 to 4 kJ/m3, respectively, but the Young’s modulus increases from 0.11 to 0.19 kPa. This work is excellent proof of regulating mechanical strength of hydrogel by adjusting the particle size of MSiO2 cross-linkers.



中文翻译:

乙烯基改性窄分散二氧化硅交联剂尺寸对丙烯酰胺基水凝胶力学性能的影响

结合了纳米到亚微米尺寸材料的聚合物水凝胶形成了令人振奋的新一代复合水凝胶。水凝胶的大部分应用是在含水环境中,它们在其中膨胀到非常高的程度。这源于聚合物链的低密度,使得它们在物理强度和它们的预期应用方面非常差。为了解决机械性能较弱的问题,通过使用 3-甲基丙烯酰氧基丙基三甲氧基硅烷 (MPTS) 改性二氧化硅颗粒 (MSiO 2 ) 作为化学交联剂增强丙烯酰胺 (AAm) 网络,成功制备了具有高拉伸强度和韧性的水凝胶。MSiO 2交联剂由窄分散二氧化硅颗粒(SiO 2) 100 nm、200 nm 和 300 nm 直径,以研究交联剂尺寸对水凝胶机械强度的影响。与传统水凝胶相比,MSiO 2的存在显着提高了水凝胶的拉伸能力和韧性。水凝胶的拉伸强度、韧性和杨氏模量分别从 30 到 11 kPa、409 到 231 kJ/m 3和 0.16 到 0.11 kPa 降低,而 SiO 2粒径从 100 到 300 nm 和浓度增加AAm 和 MSiO 2 (%) 的含量保持不变。水凝胶的抗压强度和韧性从 34 kPa 降低到 18 kPa,从 6 kJ/m 3 降低到 4 kJ/m 3,但杨氏模量从 0.11 增加到 0.19 kPa。这项工作很好地证明了通过调节 MSiO 2交联剂的粒径来调节水凝胶的机械强度。

更新日期:2023-03-29
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