Abstract
Organically modified montmorillonite (org-MMT) and high-density polyethylene (HDPE) grafted with silane groups (HDPE-g-silane) were melt compounded to give HDPE-g-silane-blend-org-MMT nanocomposites. X-ray diffractometry was performed to investigate the intercalation effect. Transmission electron microscopy was applied to observe the dispersion of org-MMT layers in HDPE matrices. The results indicate that an intercalated structure can be easily obtained in HDPE-g-silane-blend-org-MMT nanocomposites. Furthermore, positron annihilation lifetime spectroscopy was used to characterize the microstructure of the composites. It is found that the ortho-positron (o-Ps) intensity for HDPE-g-silane is decreased by approximately 10% with a narrower lifetime distribution than that for HDPE. With increasing org-MMT concentration, the o-Ps intensity I3 increases for HDPE-g-silane-blend-org-MMT nanocomposites; however, for HDPE-blend-org-MMT composites I3 decreases. It is found that HDPE composites with good dispersion can be obtained following appropriate modification of the HDPE. And silane grafting has an effect on the free volume of the HDPE nanocomposites. Copyright © 2007 Society of Chemical Industry
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