The art of mixing different materials was known to mankind from the Bronze Age. Concrete,
metal alloys, and fiber composites that are considered to be typical examples were introduced
[1]. In the early stages of polymer industry the major polymers used were wood, natural rubber,
and gutta-percha along with natural fibers such as cellulose, protein fibers, and leather. Theyear 1846 witnessed the first polymer blend (natural rubber blended with gutta-percha) which
was reported in the patents of Hancock and Parkes [1]. A single rotor masticating machine was
used for the blending process. This was followed by the slow development of blending
technology. In the first half of the twentieth century great progress in the polymer industry led
to the development of a wide range of new polymers. Later the depletion of economic ways to
develop new monomers, and the fact that newly developed monomers gave rise to polymers
with intermediate properties as compared with the existing polymers, led to the development of
polymer blending [2]. The last 80 years show an exponential increase in the number of polymer
blend patents and literature; the number almost doubled after 1993 [3]. Thus, polymer blends
are a class of materials in which at least two polymers are combined together resulting in a new
material with different physical properties [4].