By Sina Ebnesajjad
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Extra resources for Adhesives Technology Handbook, 2nd Edition
Water and methylene iodide are two liquids that are used for the determination of the components of surface tension of solid polymers by measuring contact angles. 7 gives the values of the components of their surface tension. 8 Critical Surface Tension Fox and Zisman [4,16,17] ﬁrst proposed the concept of critical surface tension in the early 1950s. In Zisman’s method, the relationship between the contact angle of various liquids on a solid and the surface tension of the liquids are investigated.
A relevant example is the adhesion of polyethylene and polypropylene to a butyl rubber. The adhesive bond is weak when two polymers are bonded at temperatures below the melting point of the polyoleﬁn. Bond strength increases sharply when the adhesion process takes place above the melting temperature of polyethylene (135˚C) and polypropylene (175˚C). 1 illustrates the bond strength (peel strength) as a function of bonding temperature. An inference can be made that at elevated temperatures, the interdiffusion of polyoleﬁns and butyl rubber increases, thus leading to higher bond strength.
The time between two consecutive drops is measured when a liquid of one density is pumped into a second liquid of a different density. 4) are the two most frequently used techniques for measuring surface tension at the liquid–air interface or interfacial tension at a liquid–liquid interface. Only the du Nouy method can be applied to measure interfacial tension. 3 Surface Tension Measurement Methods for Solids Technique Brief Description Sessile drop This method involves measurement of the contact angle optically and is used to estimate the wetting properties of a localized region on a solid surface.
Adhesives Technology Handbook, 2nd Edition by Sina Ebnesajjad