Nanocomposites containing graphene nanoplateletes (GNP) and isotactic polypropylene (PP) were obtained by in situ polymerization. The kinetics of peroxyl radical termination in the obtained nanocomposites was measured by decay of photoinduced chemiluminescence of PP. The concentration of peroxyl radicals was found to decrease significantly, and the rate of their decay was found to increase substantially in the presence of GNP. This shows that GNP is able to inhibit radical processes. At the same time, the additives of GNP were found to act as an effective catalyst, significantly decreasing oxidation induction times and increasing the rates of nanocomposite thermal oxidation. The treatment of GNP by ultrasound can reduce the catalytic activity of GNP, as a result of which the inhibitory effect of GNP becomes predominant. Possible mechanisms of catalysis and inhibition involving GNP are discussed.

通过原位获得包含石墨烯纳米片（GNP）和全同立构聚丙烯（PP）的纳米复合材料聚合。通过光诱导的PP化学发光的衰减来测量获得的纳米复合物中过氧自由基终止的动力学。发现过氧自由基的浓度显着降低，并且发现其降解速率在存在GNP的情况下显着增加。这表明GNP能够抑制自由基过程。同时，发现GNP的添加剂起有效的催化剂的作用，显着减少了氧化诱导时间并提高了纳米复合材料的热氧化速率。超声处理GNP会降低GNP的催化活性，因此，GNP的抑制作用占主导。讨论了涉及GNP的催化和抑制作用的可能机制。