纳米纤维素增强的高机械强度聚丙烯酰胺复合水凝胶
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1.中国人民大学;2.中国石油大学北京非常规油气科学技术研究院

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国家科技重大专项课题“低渗-致密油藏高效提高采收率新技术”(项目编号2017ZX05009-004)。


Mechanical strength of polyacrylamide composite hydrogel reinforced by nanocrystalline cellulose
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Unconventional Petroleum Research Institute,China University o f Petroleum

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    摘要:

    凝胶的强度决定了其用途,高机械强度的凝胶在许多领域得到应用。为了增强丙烯酰胺凝胶的强度,本文利用纳米纤维素(NCC)制备丙烯酰胺/纳米纤维素复合水凝胶,通过质构仪和流变仪研究了NCC对丙烯酰胺/纳米纤维素复合水凝胶的拉伸性能、压缩性能、粘附性能及粘弹特性的影响,并利用扫描电镜(SEM)观察了复合凝胶的微观结构。结果表明,添加NCC的丙烯酰胺/纳米纤维素复合水凝胶的拉伸强度、压缩应力、粘附力及粘弹性均明显大于不含NCC的丙烯酰胺凝胶。当AM与NCC质量比为5:3时,所形成的复合水凝胶的拉伸强度、压缩应力及粘弹性均达到最大,AM/NCC复合水凝胶的韧性增强效果明显,拉伸应力及粘附力较AM凝胶提高近4倍。AM/NCC复合水凝胶的强度与其微观结构有关,AM/NCC复合水凝胶的网络结构明显比AM凝胶更加致密。

    Abstract:

    The strength of gels determines its use and high mechanical strength gels have been applied in many fields. In order to enhance the strength of acrylamide (AM) gels, nanocrystalline cellulose (NCC) was used to prepare the AM/NCC composite hydrogel.The effects of NCC on the tensile properties, compressive properties, adhesion properties and viscoelastic properties of AM/NCC composite hydrogels were investigated by using texture analyzer and rheometer, and the microstructure of the composite hydrogels was observed by scanning electron microscope (SEM).The results showed that the tensile strength, compressive stress, adhesion and viscoelasticity of AM/NCC composite hydrogel were significantly higher than those without NCC. When the mass ratio of AM to NCC was 5:3, the tensile strength, compressive stress and viscoelasticity of the composite hydrogel reached the maximum. The toughness of AM/NCC composite hydrogel was significantly enhanced, and the tensile stress and adhesion force were nearly 4 times higher than those of AM gel.The strength of AM/NCC composite hydrogel is related to its microstructure, and the network structure of AM/NCC composite hydrogel is significantly denser than that of AM gel.

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  • 收稿日期: 2022-10-06
  • 最后修改日期: 2022-10-16
  • 录用日期: 2022-11-09
  • 在线发布日期: 2023-06-15
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