AbstractRadiation‐induced simultaneous grafting ofN,N‐dimethyl‐acrylamide (DMAA) onto natural rubber (NR) tubes has been studied to improve blood compatibility of the NR tubes. Concerning grafting of DMAA onto NR tubes, it was found that the grafting proceeds effectively in the presence of carbon tetrachloride (CCl4) as a solvent. The degree of grafting was found to be saturated at about 26 wt, but a higher degree of grafting can be obtained by either “so called two‐step grafting” or “putting a standing time for a while before irradiation.” The initial grafting rate was proportional to 0.85 power of dose rate. The apparent activation energy of the graft‐copolymerization was 7.42 kcal/mol. Evaluation of blood compatibility of DMAA‐grafted NR tubes has been carried out by ex vivo test. According to the results, significant improvement of blood compatibility was obtained for the samples in which degree of grafting is
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