Radiation grafting of acrylic acid (AAc) on poly (4-methylp'entene-]) (TPX) with different crystallinity haf, been investigated under various conditions. Free radicals formed by pre-irradiation of TPX in '"aCUII'" were more stable than those in the presence of air and might initiate the grafting reaction when came in contact with the Mc. Grafting yields increased with increasing pre-irradiation dose, grafting temperature, and concentration of Mc. lower crystallinity (TPX (24%) showed higher initial grafting rate compared with higher crystallinity one. The distribution of grafting was observed by x-ray micrc, analyzer. The grafting reaction proceeded gradually with time from the surface of the film to the ihher part. In high crystallinity TPX (34%) grafting distribution in the final stage .depended nn the: film thickness, while in the lower crystalline was homogenous regardle~ls the film. Yanti S. Soebianto*, F. Yoshii **, K. Makuuchi **, and I. Ishigaki ***Centre for the Application of Isotopes and Hadiation. NAEA **Takasaki Hadiation ChcmistTY Hesearch Est.ablishment, JAERI
