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Modification of natural rubber tubes for biomaterials. II. Radiation‐induced grafting of N , N ‐dimethylaminoethylacrylate (DMAEA) onto natural rubber (NR) tubes
Author(s) -
Razzak Mirzan T.,
Otsuhata Kazushige,
Tabata Yoneho,
Ohashi F.,
Takeuchi A.
Publication year - 1989
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1989.070380506
Subject(s) - grafting , natural rubber , monomer , materials science , solvent , polymer chemistry , chemistry , chemical engineering , composite material , polymer , organic chemistry , engineering
Radiation‐induced simultaneous grafting of N , N ‐dimethylaminoethylacrylate (DMAEA) onto NR tubes has been studied to improve blood compatibility of NR tubes. In the grafting of DMAEA onto NR tubes, effect of grafting parameters such as solvent, monomer concentration, temperature, dose, and dose rate on the grafting yield was investigated. As the results, it was found that the grafting proceeds effectively in the presence of carbontetrachloride (CCI 4 ) as a solvent. The initial rate of grafting was found to be proportional to 0.70 power of dose rate and to 0.95 power of monomer concentration. The activation energy for this grafting system was calculated to be 6.78 kcal/mol. The evaluation of blood compatibility of NR‐ g ‐DMAEA was carried out by ex vivo test. Blood compatibility of those samples was found to be dependent on only grafting yield. When the degree of grafting is higher than 30 wt %, blood compatibility of NR tube could be improved by DMAEA grafting. This is the same tendency which that of previous grafting system of NR‐ g ‐DMAA.