MODIFICATION OF POLY(PROPYLENE) BY LOW-FR EQUENCY GLOW-DISCHARGE IN AIR

Treatment of isotactic PP with glow discharge in air results in the ap pearance of oxygen-containing functional groups similar to those that are formed in the case of radical mechanism of oxidation. Plasma treat ment affects also the melting point of PP. It was shown that the-initi al PP synthesized with TiC(l)3-AlEt(2)Cl catalytic system in the prese nce of hydrogen as a transfer agent consists of two crystalline struct ures with melting points equal to 150.8 and 159.4 degrees C. The melti ng point of lower molecular-mass and less stereoregular fraction of th e polymer decreases, and sometimes this crystalline structure may even disappear.