A cluster of electrons, ions, neutrals, and photons excited by electrical filed through a gas medium called plasma. According to the plasma medium chamber, plasma is classified into Low-pressure- plasma (LPP) and Atmospheric-pressure-plasma (APT). While polymer attracted a lot of attention, modified methods to change its defectiveness are developed. Plasma modification has common effects which could change in respect of plasma forming gas. In the first part of this chapter, we discussed plasma modification and its classification. Besides, plasma reactions by polymer surfaces are studied in detail. In the second part, the Polyolefin family and its two members, Polypropylene (PP) and Polyethylene (PE) were introduced. In the third section, to scrutinize plasma forming gas effect on the modified surface, the plasma treatment of PP and PE discussed with a detailed. Great attention has been given to their applications in various fields, such as modifies base for new catalysts. Summarization is collected in the fourth section, to give a new vision to researchers.
