Positron Annihilation Study on Nickel and Iron Nano-Particles in Natural Rubber Composites | Science Publications

American Journal of Applied Sciences

Emad H. Aly¹ 

关键词: Free volume;    crosslinking density;    tensile strength;    dielectric loss;    Natural Rubber (NR);    Positron Annihilation Lifetime Spectroscopy (PALS);    Rubber Ferrite Composites (RFC);    nanoscopic inorganic;    polymer nanocomposites;    Polymer Bonded Magnets (PBMs);   

DOI  :  10.3844/ajassp.2011.147.155

学科分类：自然科学（综合）

来源: Science Publications

【 摘 要 】

Problem statement: The effect of Ni and Fe nano-particles as a filler on the free volumeproperties Of Natural Rubber (NR) was studied using Positron Annihilation Lifetime Spectroscopy(PALS). Approach: The PAL measurements revealed that the free volume properties are stronglyaffected by the amount and type of filler. Results: Particularly speaking, the free volume fractiondramatically decreased by increasing the filler content. Besides, the addition of nano-prticles creatednew positron trapping sites at filler-rubber interfaces. Furthermore, correlations were made betweenthe free volume hole sizes (V_h) and each of the mechanical and electrical properties successively. Anegative correlation was observed between V_h and hardness in the Ni-rubber composites while apositive counterpart was found in the case of Fe-rubber composites. Finally, the polarity of the fillers,being higher than that of the rubber itself, leads to an increase in electrical parameters and an inhibitionof o-Ps formation. Conclusion: These results indicate that the investigated composites are consideredto be insulating materials as their conductivity values are in the order of an insulator range.

【 授权许可】

Unknown