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Related Concept Videos

Hydrogen Bonds00:26

Hydrogen Bonds

Hydrogen BondsHydrogen bonds are weak attractions between atoms that have formed other chemical bonds. One of these atoms is electronegative, like oxygen, and has a partial negative charge. The other is a hydrogen atom that has bonded with another electronegative atom and has a partial positive charge.Hydrogen Bonds Control the World!Because hydrogen has very weak electronegativity when it binds with a strongly electronegative atom, such as oxygen or nitrogen, electrons in the bond are...
Hydrogen Bonds01:04

Hydrogen Bonds

A hydrogen bond is formed when a weakly positive hydrogen atom already bonded to one electronegative atom (for example, the oxygen in the water molecule) is attracted to another electronegative atom from another polar molecule, such as water (H2O), hydrogen fluoride (HF), or ammonia (NH3). The huge electronegativity difference between the H atom (2.1) and the atom to which it is bonded (4.0 for an F atom, 3.5 for an O atom, or 3.0 for an N atom), combined with the very small size of an H atom...
Cohesion01:07

Cohesion

Cohesion is the attraction between molecules of the same type, such as water molecules. Water molecules have an overall neutral charge but are polar molecule. An oxygen atom in one water molecule has a partial negative charge that can bind to a hydrogen atom with a partial positive charge in a second water molecule, forming a hydrogen bond. Each water molecule can form up to four hydrogen bonds with other water molecules. Hydrogen bonds are responsible for water's cohesive nature.
On a surface,...

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Evaluation of the Curing of Adhesive Systems by Rheological and Thermal Testing
09:06

Evaluation of the Curing of Adhesive Systems by Rheological and Thermal Testing

Published on: July 3, 2020

Shape memory- and hydrogen bonding-based strong reversible adhesive system.

Ruomiao Wang1, Tao Xie

  • 1Chemical Sciences & Materials Systems Laboratory, General Motors Research & Development Center, Mail Code: 480-106-710, 30500 Mound Road, Warren, Michigan 48090-9055, USA.

Langmuir : the ACS Journal of Surfaces and Colloids
|February 4, 2010
PubMed
Summary
This summary is machine-generated.

Shape memory polymers enable reversible hydrogen bonding for a novel solid adhesive. This new material offers adhesive strength comparable to traditional liquid glues.

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Area of Science:

  • Polymer Science
  • Materials Science
  • Adhesion Science

Background:

  • Conventional adhesives often involve liquid formulations with potential drawbacks like toxicity or environmental concerns.
  • Developing solid-state adhesive systems that are reversible and maintain high performance is a significant challenge in materials science.

Purpose of the Study:

  • To investigate the use of shape memory properties in polymers to enhance interfacial interactions.
  • To develop a novel, reversible, solid-based adhesive system utilizing hydrogen bonding.
  • To compare the adhesive strength of this new system with conventional liquid adhesives.

Main Methods:

  • Exploiting shape memory effects in polymers to control interfacial hydrogen bonding.
  • Fabrication of a solid-state adhesive system based on polymer interfaces.
  • Quantification of adhesive strength through standardized testing protocols.

Main Results:

  • Shape memory properties were successfully utilized to promote strong hydrogen bonding at the polymer interface.
  • A reversible solid-based adhesive system was created.
  • The developed adhesive system demonstrated adhesive strength comparable to conventional liquid adhesives.

Conclusions:

  • Shape memory polymers offer a viable mechanism for creating advanced, reversible solid adhesives.
  • This approach provides a promising alternative to liquid adhesives, potentially reducing environmental impact and improving handling.
  • The findings open new avenues for designing smart materials with tunable adhesive properties.