Preparation and properties of water-swellable natural rubber vulcanizates. (November 2015)

• Record Type: Journal Article
• Authors: Wang, B.; Liu, Z.; Liao, S.; Li, C.
• Is Part Of: Materials research innovations. Volume 19(2015)Supplement 8
• Page Start: S8-198
• Page End: S8-203
• Publication Date: 2015-11
• Subjects: Water-swellable natural rubber -- Water-swelling properties -- Chemical grafting -- Crosslinking -- Vulcanised natural latex; Materials -- Research -- Periodicals; Matériaux -- Recherche -- Périodiques; 620.1105
• DOI: 10.1179/1432891715Z.0000000001656
• Languages: English
• ISSNs: 1432-8917

Abstract

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.