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Positron annihilation lifetime spectroscopy (PALS) has been applied
in natural rubber to determine the properties of nano free volumes
(size, concentration, distribution) as a function of temperature.
The analysis of the PAL spectra have been performed by finite as
well continuous methods using the routine L.T 9.0 in its discrete
and distribution modes respectively. The results have proven, that
the PALS is sensitive to probe the glass transition temperature and
for the first time the melting transition temperature in natural
rubber. In addition, the free positrons are found to be sensitive
to the low density domains in the crystalline matrix as well as in
the interphase between crystalline and amorphous phase. The deduced
expansion coefficient indicating that o-ps is probing selectively
free volume sites in amorphous domains.
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