Dispersion and interaction of graphene oxide in amorphous and semi-crystalline nano-composites: a PALS study

[摘要] The influence of dispersion and interaction of Graphene Oxide (GO) in semicrystalline Polyhydroxy butyrate (PHB) and glassy amorphous Poly(tBP-oda) is explored by Positron Annihilation Lifetime Spectroscopy (PALS). The ortho-Positronium lifetimes which represent the main free volume hole size of both polymers are mainly affected by the large differences in internal stresses built up by the shrinkage of the polymers during their preparation, restricted by the platelet structure of GO. The ortho-Positronium intensities, which represent the ortho-Positronium formation probabilities, suggest a strong dependency of on the dispersion of the nano-particles and their aspect ratio.

[发布机构] Department of Chemistry, Polymer and Materials Chemistry, Lund University, P.O. Box 124, Lund; SE-22100, Sweden^1

[效力级别] 化学

[关键词] Glassy amorphous;Hole size;ortho-Positronium lifetime;Positron annihilation lifetime spectroscopy;Positronium formation;Semicrystallines