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Adhesion01:14

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Adhesion occurs when one type of molecule is attracted to a different molecule. Water exhibits adhesive properties in the presence of polar surfaces, such as glass or cellulose in plants. For instance, when water is poured into a glass, the positively charged hydrogen molecules of water are more attracted to the negatively charged oxygen molecules in the silica than to the oxygen in neighboring water molecules.
Capillary action is a result of water’s adhesive tendencies. When a narrow...
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Concrete's susceptibility to water absorption is due to the capillary action within the pores of its hydrated cement paste. This action draws water in, creating the need for waterproofing admixtures to prevent such penetration. The efficacy of these admixtures is contingent upon the water pressure, with variations arising from different conditions such as rain, capillary rise, or hydrostatic pressure in structures intended to hold water.
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纤维素纳米晶-稳定生物基水性聚氧氨纳米复合材料,具有增强的粘合性能.

Hsin-Chen Chen1,2, Gilles Sèbe2, Thomas Vidil2

  • 1Division of Glycoscience, Department of Chemistry, School of Engineering Sciences in Chemistry, Biotechnology and Health, KTH Royal Institute of Technology, AlbaNova University Centre, SE-106 91 Stockholm, Sweden.

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PubMed
概括

这项研究引入了可持续的,高性能粘合剂,使用由纤维素纳米晶体 (CNCs) 稳定的生物基聚氨 (PHUs). 这种绿色化学方法可以提高粘合力的强度,而不需要危险的化学物质或表面活性剂.

关键词:
纤维素纳米晶体的使用腿部剪切强度的强度对于压力敏感的粘合剂悬浮物质聚合物化的悬浮物质.在水中传播的聚氧化氨.

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科学领域:

  • 材料科学 材料科学 材料科学
  • 聚合物化学 聚合物化学
  • 绿色化学 绿色化学

背景情况:

  • 传统的聚氨 (PU) 使用危险的异酸盐和基于溶剂的方法.
  • 对于可持续和高性能粘合材料的需求日益增长.

研究的目的:

  • 使用生物基单体和纤维素纳米晶体 (CNCs) 开发水性聚氧氨 (PHUs).
  • 研究CNC作为PHU合成中的稳定剂和强化剂的潜力.
  • 为了评估由此产生的PHU/CNC纳米复合材料的粘合性能.

主要方法:

  • 通过使用1,6-hexanediol bis- ((环碳酸盐) 和生物基Priamine 1075的无催化剂悬浮聚合合成水性PHU.
  • 使用原始纤维素纳米晶体 (CNC) 作为底部稳定剂和增强纳米填充剂.
  • 描述了乳液的合稳定性和干燥纳米复合材料中CNC的分布.

主要成果:

  • 实现了高CNC负载 (高达~17%重量) 的稳定单体在水中的乳液.
  • 在乳中的粒子表面定位的CNC,确保稳定性,并在干燥的纳米复合材料中均分散.
  • 与传统方法相比,观察到探针粘合强度 (高达680%) 和膝盖剪切强度 (高达340%) 的显著提高.

结论:

  • 由CNC稳定的生物基PHU为高性能粘合剂提供了可持续的途径.
  • CNCs作为有效的稳定剂和增强剂,改善机械性能.
  • 这种方法符合绿色化学原则,减少对危险化学品和石油衍生表面活性剂的依赖.