Abstract
Water-swellable natural rubber was prepared with natural rubber latex grafted with acrylamide. Monomer cross-linked water-swellable natural rubber and vulcanised water-swellable natural rubber were synthesised separately through grafting of acrylamide onto natural rubber latex, using formaldehyde and sulphur as monomer cross-linking agent and rubber vulcanising agent, respectively. Effects of different cross-linking modes on water-swelling properties and repeat water-swelling properties were studied. Mechanical properties were studied by dynamic mechanical analysis. The state of water in water-swellable natural rubber, cross-linked water-swellable natural rubber and vulcanised water-swellable natural rubber was studied by differential scanning calorimetry. Thermal stability of water-swellable natural rubber, cross-linked water-swellable natural rubber and vulcanised water-swellable natural rubber was studied by thermo gravimetric analysis. Microstructure of fractured surface was analysed by scanning electron microscope. The results showed that water-swelling ratio and repeat water-swelling ratio of water-swellable natural rubber were decreased with increasing amount of cross-linking agents. Storage modulus was enhanced after cross-linking treatment. Bound water absorbency and thermal stability were decreased with increasing cross-linking degree. Network structure was much more compacted after cross-linking treatment.
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