A study on some properties of styrene butadiene rubber-polyethylene blends by positron annihilation lifetime spectroscopy

The miscibility of blends of Styrene Butadiene. Rubber (SBR) and polyethylene (PE) has been investigated using positron annihilation lifetime spectroscopy (PALS). The effect of weight percentage of rubber added to pure and waste PE of low and high density (LDPE & HDPE) was investigated. It has been found that, a larger hole volume size and concentration in SBR forms a miscible blend with PE The average ortho-positronium lifetime tau(3) and its intensity tau(3) of the blends show a negative deviation from the linear relationship of initial polymers. This could be interpreted in terms of segmental conformation and packing between dissimilar polymers. In addition, a negative correlation between the free-volume parameters (size and concentration) and the electrical and mechanical properties of the pre-mentioned samples has been established as a function of weight percentage of waste PE.