Studies on the use of nano zinc oxide and modified silica in NR, CR ...

Use of nano zinc oxide in chloroprene rubber
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5.1 Introduction
5.1 Introduction
5.2 Experimental
5.3 Results and discussion
5.4 Conclusions
5.5 References
Synthetic rubbers are more uniform in quality and compounds are
more consistent in both processing and product properties. 1 There are polar
and non-polar synthetic rubbers. Polychloroprene known as neoprene is a
polar rubber and is generally considered as a special purpose rubber being
used for applications requiring oil and solvent resistance.
There has been a long standing commercial need for oil resistant
elastomers. 2 For example, oil resistant materials are very important to the
automotive industry since a variety of components may come in contact with
a number of fluids. In the specific case of engine seals, it is important that
they be able to withstand the fluids they are sealing without losing their
ability to maintain the seal either by becoming too soft or too brittle. 3
Examining the specific reasons for the chemical resistance of polymers, it can
be seen that polar side groups tend to provide resistance to swelling in
hydrocarbon oils. 4 This induces slight electronegative charge on the
electronegative atom with a slight positive around the carbon atom. The
dipole moment produced tends to provide oil resistance. As the
electronegativity of the side chain group increases on a polymer, so does its