Solid Phase Graft Copolymerization: 2. Effect of Toluene
Toluene was used as the interfacial agent to enhance the graft level in the solid phase graft copolymerization of polypropylene and maleic anhydride. The effect of catalyst and interfacial agent on the graft efficiency was investigated. It was found that the interfacial agent enhanced the graft level significantly at high initiator concentrations. At low initiator concentrations, however, only a slight increase in graft level was observed. In the absence of catalyst and interfacial agent, at high initiator concentrations (12.5%), the graft obtained was only 3.9%. In the presence of 5% catalyst and 10% interfacial agent the graft level doubled to 7.9%. This significant increase in graft level was attributed primarily to the catalyst which increased the graft level at an average from 3.9% to 6.8%. The final colour of the reaction product was influenced only by the type and amount of catalyst and not by the interfacial agent. The addition of interfacial agent resulted in agglomerates and lumps in the final product. This product had a tendency to adhere to the mixing blades in the reactor. This may be attributed to the uneven addition of the interfacial agent into the reactor. Quantitative determination of the graft level was performed by wet chemical methods and FTi.r. was used to determine the presence of maleic anhydride in the copolymer.
R. Rengarajan et al., "Solid Phase Graft Copolymerization: 2. Effect of Toluene," Polymer, Elsevier, Jan 1989.
The definitive version is available at http://dx.doi.org/10.1016/0032-3861(89)90195-X
Chemical and Biochemical Engineering
Keywords and Phrases
Solid Phase Graft Copolymerization; Interfacial Agents; Graft Levels
Article - Journal
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