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Abstract
The free volume of octaphenyl polyhedral oligomeric silsesquioxane (OPS) modified polyurethane prepared from different dispersion method was investigated using Positron annihilation lifetime spectroscopy (PALS). The relationships of free volume and mechanical property were analyzed. Our results showed that OPS decreased the original free volume hole size and fraction, but varied with the dispersion method. For the sonication dispersion samples, the tensile was conform to the free volume fraction, while the elongation at break was against the free volume hole size. In the high shear dispersion process, the tensile increased and no apparent change was seen on the elongation at break.
ACKNOWLEDGMENT
This work was supported by the Developing Foundation of China Academy of Engineering Physics (No. 2007A03003) and opening project of Engineering Research Center of Biomass Modified Materials of Southwest Technology University (No. 09zxbk07).
