Department of Chemical Engineering, Izmir Institute of Technology, Gulbahcekoyu, Urla-lzmir, Turkey; Department of Chemistry, College of Education, Warri, Nigeria; Department of Chemistry, Centre for Biomaterials Research, University of Benin, Benin City,
Balköse, D., Department of Chemical Engineering, Izmir Institute of Technology, Gulbahcekoyu, Urla-lzmir, Turkey; Egbuchunam, T.O., Department of Chemistry, College of Education, Warri, Nigeria; Okieimen, F.E., Department of Chemistry, Centre for Biomaterials Research, University of Benin, Benin City, Nigeria
Epoxidized rubber seed oil (4.5% oxirane content, ERSO) was prepared by treating the oil with peracetic acid generated in situ by reacting glacial acetic acid with hydrogen peroxide. The thermal behavior of the ERSO was determined by differential scanning calorimetry. The effect of the epoxidized oil on the thermal stability of poly (vinyl chloride) (PVC) plastigels, formulated to contain dioctyl phthalate (DOP) plasticizer and various amounts of the epoxidized oil, was evaluated by using discoloration indices of the polymer samples degraded at 1600C for 30 min and thermogravimetry at a constant heating rate of 10°C/min up to 600°C. The thermal behavior of the ERSO was characterized by endothermic peaks at about 150°C, which were attributed to the formation of network structures via epoxide groups, and at temperatures above 300°C, which were due to the decomposition of the material. Up to 50% of the DOP plasticizer in the PVC plastisol formulation could be substituted by ERSO without a marked deleterious effect on the consistency of the plastigel formed. In the presence of the epoxidized oil, PVC plastigel samples showed a marked reduction in discoloration and the number of conjugated double bonds, as well as high temperatures for the attainment of specific extents of degradation. These results showed that the ERSO retarded/inhibited thermal dehydrochlorination and the formation of long (n > 6) polyene sequences in PVC plastigels. The plasticizer efficiency/permanence of ERSO in PVC/DOP plastigels was evaluated from mechanical properties' measurements, leaching/migration tests, and water vapor permeability studies. The results showed that a large proportion of DOP could be substituted by ERSO in a PVC plastisol formulation without deleterious effects on the properties of the plastigels. © 2008 Society of Plastics Engineers.
Acetic acid; Agricultural products; Differential scanning calorimetry; Discoloration; Esters; Fatty acids; Gravimetric analysis; Hydrogen; Hydrogen peroxide; Laser interferometry; Mechanical permeability; Mechanical properties; Offshore oil well production; Oil well production; Oils and fats; Organic compounds; Organic polymers; Photoacoustic effect; Plasticizers; Plastisols; Polymers; Polyvinyl chlorides; Reaction kinetics; Reinforced plastics; Rubber; Seed; Sulfate minerals; Thermodynamic stability; Water vapor; (p ,p ,t) measurements; (PL) properties; Conjugated double bonds; Constant heating rate; Dehydrochlorination; Deleterious effects; Dioctyl phthalate (DOP); Endothermic peaks; Epoxide groups; Glacial acetic acid (HAc); High temperature (HT); In-situ; Network structures; Oxirane; Peracetic acid (PAA); Poly(vinyl chloride) (PVC); Polyene sequences; Polymer samples; Rubber seed oil (RSO); Scanning calorimetry; thermal stability; Water vapor permeability (WVP); Plastic products