ISSN:
1435-1536
Keywords:
Wetting
;
contact angle
;
surface tension
;
polymers
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
,
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Abstract An overview is given on measuring techniques for contact angles between smooth solids and liquids, solid-vapor surface tension of rough and porous solids, and wetting behavior of polymer melts. It has been shown that on non-inert polymer surfaces, such as maleimide copolymers and polystyrenes, Young contact angles can be obtained by dynamic contact angle measurements using liquids that do not swell the polymer. In the case of rough and porous polymer systems, such as polymer powders, a capillary penetration technique is suitable to determine their solid-vapor surface tension, but this method cannot reveal polar groups burried in the surface region of grafted polymers. It was shown that these polar groups can be characterized by receding contact angles. Using thin fibers for the reinforcement of polymers, contact angle measurements with pure test liquids on the individual fibers and the solid polymer matrix at room temperature are not suitable to elucidate the complex wetting processes between the fiber and the polymer matrix under processing conditions. A device for direct wetting measurements between individual fibers and polymer melts at high temperatures, comparable with processing conditions of the composites, and first results are presented.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01188924
Permalink
