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Related Concept Videos

Adhesion01:14

Adhesion

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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.
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Plants have rigid cell walls that are made up of cell wall polysaccharides that mediate cell-cell adhesion. The primary cell walls of plants consist of two independent and interacting polysaccharide networks: a pectin matrix that embeds the second network comprising cellulose and hemicelluloses.
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 Every plant cell has a cell wall that protects the cell, provides structural support, and gives the cell shape. Cellulose, the main structural component of the plant cell wall, makes up over 30% of plant matter. It is the most abundant organic compound on earth.  Cellulose is an unbranched polysaccharide composed of linear chains of glucose molecules linked by β (1→4) glycosidic bonds.
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A Testing Platform for Durability Studies of Polymers and Fiber-reinforced Polymer Composites under Concurrent Hygrothermo-mechanical Stimuli
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Functionalized cellulose-based adhesive with epoxy groups having high humidity resistance performance.

Fengying Dai1, Haochen Liu2, Jing Wang3

  • 1State Key Laboratory of Separation Membranes and Membrane Processes, National Center for International Joint Research on Separation Membranes, School of Material Science and Engineering, Tiangong University, Tianjin 300387, China; Cangzhou Institute of Tiangong University, Cangzhou 061000, China.

International Journal of Biological Macromolecules
|August 30, 2024
PubMed
Summary

This study developed a hydrophobic cellulose-based adhesive from microcrystalline cellulose (MCC) for sustainable applications. The modified adhesive exhibits excellent bonding strength and water resistance, even in humid conditions.

Keywords:
AdhesiveCelluloseHumidity resistanceWood

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Sustainable Chemistry

Background:

  • Industrial adhesives often rely on non-renewable resources and pose health risks.
  • Cellulose, an abundant natural polymer, shows promise for adhesive applications but suffers from hydrophilicity.
  • High humidity environments pose a significant challenge for conventional cellulose-based adhesives.

Purpose of the Study:

  • To develop a hydrophobic and anti-swelling cellulose-based adhesive.
  • To enhance both adhesive and cohesive properties of cellulose-based materials.
  • To create a sustainable adhesive alternative with superior performance in humid conditions.

Main Methods:

  • Modification of microcrystalline cellulose (MCC) using epoxy compounds.
  • Utilizing the reaction between epoxy groups and hydroxyl groups during hot-pressing.
  • Testing bonding strength in dry, wet (water immersion), and high humidity (90%) conditions.

Main Results:

  • The modified MCC adhesive demonstrated excellent hydrophobic and anti-swelling properties.
  • Achieved a dry bonding strength of 6.02 ± 0.26 MPa and a wet bonding strength of 4.78 ± 0.21 MPa after 3 hours in 63°C water.
  • Maintained stable bonding strength at 90% relative humidity and showed versatility across substrates like aluminum, iron, and glass.

Conclusions:

  • Epoxy modification effectively enhances the water resistance and bonding performance of cellulose-based adhesives.
  • The developed adhesive offers a sustainable and high-performance alternative to conventional industrial adhesives.
  • This approach presents a viable method for manufacturing advanced cellulose-based adhesives for demanding environments.