Epoxy Nanocomposites

16 July 2007

In site polymerization was the first method used for synthesizing polymer clay nanocomposites and nylon was first produced. Although there are various methods of preparation of nanocomposites, the two are more common. In one, the epoxy monomer reacts with clay and subsequently; the curing agent is mixed and in another epoxy and curing agents is added simultaneously. Both these reactions are two stages and depending upon the type of polymer, polymerization is carried out by adding free radicals or an increase in temperature.

Thermal stability is one of the critical limitations of these epoxy nanocomposites. Researchers carried out experiments on these composites and analyzed the volatile materials. In the range of 200 and 500 degree centigrade, long chain alkyl fragments are detected. FTIR study on the nanocomposite samples before and after test at 1 hr at 400C showed no degradation.

Researchers also studied the mechanical properties of the epoxy nanocomposites and it was found that mechanical properties reported include increased in modulus, retention or minor loss in tensile strength and loss of strain to failure.

In conclusion, we can say that the methods of preparation of epoxy nanocomposites are the prime factors responsible for various mechanical and thermal properties. The pH and critical concentration of clay also play an important role. It is possible to obtain significant improvement in modulus, however decreased strain of failure is a factor in current epoxy nanocomposite and is being investigated by the researchers.

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