氢键增强酰腙动态共价键智能水凝胶的制备及性能
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1.华东交通大学材料科学与工程学院,高分子材料与工程系;2.华东交通大学材料科学与工程学院,高分子材料与工程系

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国家自然科学基金资助项目(21802041,21865009)


Preparation and Properties of Hydrogen-Bonding Reinforced Smart Hydrogels crosslinked with Acylhydrazone Reversible Covalent Bonds
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    摘要:

    首先,通过可逆加成-断裂转移(RAFT)聚合制备了一系列双丙酮丙烯酰胺(DAAM)、N-异丙基丙烯酰胺(NIPAM)和含脲基嘧啶酮(UPy)基团单体(Mu)的共聚物(PDAAM-co-PNIPAM-co-Mu);然后,利用己二酸二酰肼(ADH)和PDAAM-co-PNIPAM-co-Mu反应,得到酰腙动态共价键交联的智能水凝胶。通过扫描电镜(SEM)、流变仪和万能试验机对智能水凝胶的结构、力学性能、以及智能特性进行了考察。实验结果表明,UPy基团引入到该水凝胶网路中能够通过氢键增强水凝胶,其压缩强度提高了近4倍;同时,该水凝胶具有pH 和温度双重响应、自愈合性能,并且水凝胶的压缩强度在温度响应之后提高了近30倍。

    Abstract:

    A series of PDAAM-co-PNIPAM-co-Mu copolymers were synthesized by RAFT polymerization from diacetone acrylamide (DAAM), N-isopropylacrylamide (NIPAM) and ureidopyrimidinone-containing monomer (Mu). Their structure and composition were characterized by Nuclear Magnetic Resonance (1H-NMR) and Gel Permeation Chromatography (GPC). Smart hydrogels crosslinked with acylhydrazone reversible covalent bonds were obtained by the reaction between PDAAM-co-PNIPAM-co-Mu and adipic dihydrazide (ADH). Due to the introduction of ureidopyrimidinone (UPy) hydrogen-bonding units into the network, the mechanical properties of the hydrogels were reinforced, and the compression strength of the hydrogel was increased by ca. 4 times. Meanwhile, the hydrogels exhibited pH and temperature dual-responsive and self-healing properties, and the compression strength was increased by ca. 30 times after heating.

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  • 收稿日期:2022-04-13
  • 最后修改日期:2022-05-24
  • 录用日期:2022-05-25
  • 在线发布日期: 2023-06-21
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