taken by own) [Public domain], via Wikimedia Commons
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Green chemistry application to intermolecular forces презентация
Содержание
- 1. Green chemistry application to intermolecular forces
- 2. Intermolecular Forces Forces between molecules Permanent dipoles
- 3. Applications Determines various physical properties of
- 4. An adhesive is a substance that sticks
- 5. The adhesive will “wet” or cover the
- 6. For an adhesive to wet a surface,
- 7. Adhesive Curing Once the adhesive is applied
- 8. So HOW do glues compare?
Intermolecular Forces Forces between molecules Permanent dipoles Induced dipoles van der Waals or London Dispersion forces Hydrogen bonds
Слайд 2Intermolecular Forces
Forces between molecules
Permanent dipoles
Induced dipoles
van der Waals or London Dispersion
forces
Hydrogen bonds
Hydrogen bonds
Слайд 3Applications
Determines various physical properties of a molecular solid
Melting point
Boiling point
Vapor
pressure
Adhesive force of glue
Adhesive force of glue
Слайд 4An adhesive is a substance that sticks to the surface of
an object such that two surfaces become bonded.
By Amirreza Saharkhiz (Own work) [CC BY-SA 3.0 (http://creativecommons.org/licenses/by-sa/3.0)], via Wikimedia Commons
Слайд 5The adhesive will “wet” or cover the substrate, when the Intermolecular
forces between the glue and the substrate are stronger than the Intermolecular forces between the glue and glue.
By Mk2010 (Own work) [CC BY-SA 3.0 (http://creativecommons.org/licenses/by-sa/3.0) or GFDL (http://www.gnu.org/copyleft/fdl.html)], via Wikimedia Commons
Слайд 6For an adhesive to wet a surface, the adhesive should have
a lower surface tension, than the solid’s surface energy (or critical surface tension),
By MesserWoland (own work created in Inkscape) [GFDL (http://www.gnu.org/copyleft/fdl.html), CC-BY-SA-3.0 (http://creativecommons.org/licenses/by-sa/3.0/) or CC BY-SA 2.5-2.0-1.0 (http://creativecommons.org/licenses/by-sa/2.5-2.0-1.0)], via Wikimedia Commons
Слайд 7Adhesive Curing
Once the adhesive is applied to the substrate, it will
begin to cure, or form a permanent bond
Different Adhesives have different mechanisms in which the curing takes place
Different Adhesives have different mechanisms in which the curing takes place
Theilr’s Flickr account – Creative Commons Attribution
Слайд 8
So HOW do glues compare?
In the following lab you will
investigate the differences in the adhesive ability of some different types of glues
By Selena Wilke (Own work) [Public domain], via Wikimedia Commons
