Research Progress on Improving Solid Phase Grafting of PP with Supercritical CO_2 and Its Influencing Factors

The assistant effect of supercritical CO2 on the solid phase grafting of polypropylene was reviewed.The advantage,synergy effect and permeation mechanism of supercritical CO2,and the influences of different factors in swelling process,the selection of initiator and monomer were discussed.The supercritical CO2 assisting solid phase grafting technology with easy post processing could improve the unhomogeneity during the grafting,in which the degradation of PP was in a low rate.It was a functionalized modification of PP with good development prospect.