Effect of Environmental Temperature on Ultraviolet Irradiated PP and its Composite

Abstract

Some oxygen-containing groups such as C—O and C=O were introduced onto the molecular chains of polypropylene (PP) through ultraviolet irradiation at different environmental temperatures in air. The concentration of the oxygen-containing groups was increased with the increasing environmental temperature after the same ultraviolet irradiation time. After irradiation at different environmental temperatures, there was no gel formed in PP. The crystal shape of irradiated PP kept unchanged, which was still monoclinic crystal. After the same ultraviolet irradiation time, the melt temperature of the irradiated PP decreased and its crystallinity was increased with the increasing environmental temperature. Compared with those of PP, the melt flow rate and hydrophilicity of the irradiated PP was improved, and their variation ranges was expanded with the increasing environmental temperature. The mechanical properties of PP/CaCO3 composite compatibilized by irradiated PP at different environmental temperatures were en...