HW 5 Problem 4

HW 5 Problem 4
The term "polymer brush" refers to the connection of polymers to a surface to act as a lubricant. The
connection is referred to as "tethering". In order to be effective, the grafting of the polymer brushes
must be dense and it must be immersed in a good solvent. This, in turn, will result in a low frictional
surface. The advantage of a polymer brush opposed to a liquid lubricant is that the polymer brush will
remain in place where as a liquid lubricant must be bounded and/or pressurized to keep it in place. This
is especially useful in systems where the sliding motion between two surfaces is of a low velocity.