Mono-component polymer composites are made of materials with the two components of the different high order structures. The mono-component polyester composites consisted of the craze and non-craze regions, which were processed the unique crazing technique. A Characteristic morphology of this crazed composites indicates that a transparent film from a normal viewpoint and an opaque film from a tilted angle viewpoint (view field selectivity) were observed. Mono-component polyester composites are ecomaterials for the separating-free of components and the suitability of a regenerated PET.