Radiation grafting of hydrophilic monomers on to plasticized poly(vinyl chloride) sheets. II. Migration behaviour of the plasticizer from N-vinyl pyrrolidone grafted sheets.
The grafting of N-vinyl pyrrolidone, a hydrophilic monomer, on to flexible poly(vinyl chloride) sheets used in medical applications using ionizing radiation from a 60Co source was studied. The graft yield was found to increase linearly with monomer concentration and also with increasing radiation doses. The migration of the plasticizer di-(2-ethylhexyl)phthalate into a strong organic extractant such as n-hexane was studied at different time intervals for different grafted systems of poly(vinyl chloride) at 30 degrees C. The results indicated a drastic reduction in the leaching of the plasticizer from grafted systems versus ungrafted controls. Incorporation of ethylene dimethacrylate cross-linker during grafting did not seem to affect the graft yield considerably but appeared to further reduce the plasticizer migration. Surface energy calculations of the grafted samples indicate that the surfaces are highly hydrophilic compared to ungrafted poly(vinyl chloride) and the polar and dispersion components tend to vary with increasing cross-linker concentration.
Krishnan
V K
VK
Sree Chitra Tirunal Institute for Medical Sciences and Technology, Trivandrum, India.
Jayakrishnan
A
A
Francis
J D
JD
D001672:Biocompatible Materials; D003037:Cobalt Radioisotopes / Q000737:chemistry*; D008422:Materials Testing; D011143:Polyvinyl Chloride / Q000737:chemistry / Q000528:radiation effects*; D011760:Pyrrolidinones / Q000737:chemistry / Q000528:radiation effects*; D013499:Surface Properties
D001672:Biocompatible Materials; D003037:Cobalt Radioisotopes; D011760:Pyrrolidinones; C042670:N-vinyl-2-pyrrolidinone; D011143:Polyvinyl Chloride