Nanocomposites of Au/Disentangled UHMWPE: A Combined Optical and Structural Study.

Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry
Stavros X DrakopoulosSara Ronca

Abstract

The term disentangled refers to polymers with fewer entanglements in the amorphous regions, a metastable condition that can significantly affect the material's properties and processing behavior. The lower entanglement density in ultra-high molecular weight polyethylene (dis-UHMWPE) facilitates the solid-state processability into uniaxially-oriented specimens reaching very high draw ratios and crystallinities. In this study, Au/dis-UHMWPE nanocomposites were formulated and processed at variable draw ratios. Polarized light microscopy suggests gold nanoparticles are oriented in arrays following the drawing of polymer chains. The structural features, upon orientation, are studied by means of Raman spectroscopy, wide- and small-angle X-ray scattering, and near-infrared spectrophotometry. Crystallinity is found to increase by 15%, as calculated by wide-angle X-ray scattering. The change in optical absorbance in the visible spectrum indicates that, with orientation, the average size of gold aggregates increases, supported quantitatively by small-angle X-ray scattering. Since the gold nanoparticles are expected to be found within amorphous chain segments, the aforementioned findings are attributed to the increase of crystallinity and...Continue Reading

References

Jan 9, 2003·Chemical Reviews·Vernon C Gibson, Stefan K Spitzmesser
Jul 26, 2005·Nature Materials·Sanjay RastogiHans W Spiess
Mar 8, 2008·Applied Optics·Y DirixP Smith
Mar 9, 2010·Nature Nanotechnology·Sheng ShenGang Chen
Aug 14, 2019·Proceedings of the National Academy of Sciences of the United States of America·Andrew B RobbinsAustin J Minnich

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Methods Mentioned

BETA
scanning
light microscopy
X-ray
light optical microscopy
NMR
irradiate
light scattering

Software Mentioned

Foxtrot

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