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首页> 外文期刊>RSC Advances >Enhancing the self-recovery and mechanical property of hydrogels by macromolecular microspheres with thermal and redox initiation systems
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Enhancing the self-recovery and mechanical property of hydrogels by macromolecular microspheres with thermal and redox initiation systems

机译：具有热和氧化还原引发体系的大分子微球增强水凝胶的自恢复和机械性能

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In this investigation, a tough hydrogel was reinforced by macromolecular microspheres (MMs) as hydrophobic association centers via free radical polymerization with different initiation systems. The thermal initiator is potassium persulfate and the redox initiators include potassium persulfate and N,N,N′,N′-tetramethylethylenediamine (TMEDA). The mechanical measurements showed that the hydrogel with a redox initiation system possesses a tensile strength of 1.55 MPa, which is much higher than the hydrogel with a thermal initiator. Moreover, the hydrogel with redox initiators exhibited rapid self-recovery to its 90% original dimension in several seconds and low swelling property. The large difference in the morphology of hydrogels before and after swelling was due to the tight entanglement of molecular chains in the internal structure of hydrogels with redox initiators. As a result, the hydrophobic association hydrogels toughened by MMs with excellent mechanical properties would be useful for biomedical applications of tough tissue engineering, such as tendon, muscle, and blood vessel.
机译：在这项研究中，强韧的水凝胶被大分子微球（MMs）作为疏水缔合中心，通过不同引发体系的自由基聚合而得到增强。热引发剂是过硫酸钾，氧化还原引发剂包括过硫酸钾和 N ， N ， N '， N ′-四甲基乙二胺（TMEDA）。力学测量表明，具有氧化还原引发体系的水凝胶的拉伸强度为1.55 MPa，远高于具有热引发剂的水凝胶。而且，具有氧化还原引发剂的水凝胶在几秒钟内显示出快速的自恢复性，恢复到其原始尺寸的90％，溶胀性低。溶胀前后水凝胶形态的巨大差异是由于分子链与氧化还原引发剂紧密缠结在水凝胶的内部结构中。结果，具有优异机械性能的MM增韧的疏水缔合水凝胶可用于坚韧的组织工程（如腱，肌肉和血管）的生物医学应用。

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