Abstract
The grafting of a modified cationic polyacrylamide (MCPAM) onto natural rubber (NR) latex to form a copolymer using potassium persulphate (K2S2O8) to generate active radicals on both the NR particle surface as well as on the MCPAM molecules was confirmed by ATR-FTIR. The copolymers showed a marked ability to absorbe palm oil up to 10 g g−1. First, the high molecular weight cationic polyacrylamide (CPAM) was reduced by using a combination of K2S2O8 and hydrogen peroxide (H2O2) through thermal degradation. The molecular weight of the CPAM as determined by viscosity was about 4000 g mol−1. It was then added to the NR latex in the presence of Terric16A16 at 60°C for 3 h and cast as a film on a glass plate to obtain the NR-g-PAM. In a water medium, the swelling ratio of the modified NR decreased as a function of the CPAM concentration. Also the thermal stability of the modified NR-g-PAM was higher than of the NR/PAM blend as confirmed by TGA. Finally, the ability of NR-g-MCPAM to absorb palm oil was investigated.
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