Interpenetrating polymer networks consisting of natural rubber (NR) and either cellulose or chitin were prepared using a simple co-precipitation process. The polysaccharide was first dissolved in alkaline/urea aqueous solution at low temperature to form a 4 wt% transparent solution. This solution was mixed with dilute NR latex and the mixture was co-precipitated by adding ethanol. After purification and drying, films were prepared by hot-pressing. The interpenetrating polymer network morphology of ensuing films was evidenced by scanning electron microscopy. Extensive physical entanglements and interlocks were promoted during the coagulant-induced gelation process, resulting in strong interactions and highly efficient load transfer between both components. A striking reinforcement effect towards the elastomer was observed. Swelling as well as stiffness/resilience of the material can be tailor by changing the NR/polysaccharide ratio.

Preparation of interpenetrating polymer networks from natural rubber and polysaccharide

256th National Meeting (2018)

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