Abstract
Electron spin resonance (ESR) or electron paramagnetic resonance (EPR) spectroscopy is a sophisticated technique for studying materials with paramagnetic properties (unpaired electrons). Generally polymers are very stable macromolecules, having all paired electrons so a stable free radical is added into it to study the same. The specific superiority of ESR as compared to other spectroscopic techniques is that a small amount of nitroxide radicals (> 1 wt%) implanted in a polymer matrix through spin probe (diffusion) and spin label (covalently bonded with polymer) methods results in a good signal-to-noise ratio and also does not noticeably affect the inherent properties of the polymer matrix. ESR is a suitable instrumentation technique to evaluate the segmental molecular motions and structural parameters of different types of polymeric system. ESR experiments may also provide further insight into the reinforcement mechanism of fillers and the interactions between filler and matrix. The current chapter deals with the extensive study of natural rubber composites and nanocomposites by using ESR spectroscopy.
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