GRAFTING POLYMERIZATION OF ACRYLIC-ACID ONTO PREIRRADIATED POLYPROPYLENE FABRIC

Acrylic acid (AAc) was grafted onto polypropylene (PP) fabric by a pre irradiation method using a Co-60 gamma ray. The effect of absorbed dos e, AAc concentration, reaction temperature, reaction time, storage tim e, as well as the effect of ferrous ion and sulfuric acid on the degre e of grafting were determined. It has been shown that the synergistic effect of sulfuric acid with the ferrous sulfate can not only increase the grafting yield, but also decrease the apparent activation energy for the grafting. It leads to the possibility of getting a particular grafting yield at a lower absorbed dose. In this experiment, It has al so been shown that the grafting activity of preirradiated PP fabric in AAc aqueous solution could be well kept at room temperature for a lon g period.