Abstract
ABSTRACT NR is hydrophobic and cannot be used to store, transfer, or make contact with hydrocarbon compounds. We report a simple method to increase the hydrophilicity of NR: a chlorohydrination reaction of NR latex by using sodium hypochlorite is described. It was found that only chlorohydrinated NR was obtained and side products were unnoticeable. The effects of sodium hypochlorite concentration, hydrochloric acid concentration, surfactant concentration, and reaction time on chlorohydrin content in NR were investigated. The swelling resistance of chlorohydrinated NR with 11% chlorohydrin content in diesel and gasohol fuels was improved nearly 3-fold and 4-fold, respectively, compared to that of the unmodified NR. The thermal and mechanical properties of the chlorohydrinated NR were characterized and found to be similar to those of pristine NR, indicating that the chlorohydrinated NR can be an excellent substitute for NR. This method has merits such as low cost of raw materials, easier and greener production processes than traditional methods, and scaling-up possibilities for the fabrication of chlorohydrinated NR for a variety of applications.
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