Publications
| Authors | Pötschke, P. ; Bhattacharyya, A.R. ; Janke, A. ; Goering, H. |
|---|---|
| Title |
Composites of Polycarbonate with Multiwalled Carbon Nanotubes Produced by Melt Mixing
Advances in Polycarbonates, D.J. Brunelle, M. Korn, ed. |
| Date | 20.04.2005 |
| Number | 11505 |
| Abstract | Advances in Polycarbonates includes such topics as theory and modelling, synthesis of new polycarbonates, characterization, development of enhanced properties in polycarbonates (such as conductivity, weatherability, higher heat or better low temperature ductility), recycling, and process chemistry. A variety of international researchers from industry, government, and academia have provided a diverse array of recent research. BPA-Polycarbonate is a versatile engineering material with a combination of many important properties: optical-quality transparency and birefringence, high refractive index, high glass transition temperature, exceptional impact strength and good processability. Fifty years after its discovery, academic and industrial polycarbonate research continues to grow annually. Polycarbonates are used in a very large variety of applications, ranging from optical recording media (CD, DVD, etc.), sporting equipment, unbreakable glazing materials, lighting, medical equipment, and automotive exteriors and interiors. <br /><br />Composites of polycarbonate (PC) with varying amount of multiwalled carbon nanotubes (MWNT) were prepared by diluting a PC based masterbatch containing 15 wt% MWNT using melt mixing technique. Electrical resistivity data showed percolation of MWNT between 1 and 1.5 wt%. Near the percolation threshold longer mixing at low rotation speed seems to be favorable. The formation of network-like structures also could be detected by oscillatory rheometry and visual observations of the composite dispersions in a PC-solvent. Transmission electron microscopy and atomic force microscopy were used to characterize the state of MWNT dispersion and indicated no pronounced orientation in extrusion direction. The mechanical reinforcement aspect of MWNT is also regarded in context with the masterbatch diluting technology. It was found that molecular weight reduction of PC takes place due to the high shear forces in presence of nanotubes during the masterbatch preparation. This leads to changes in glass transition temperature and counteracts the effects originating from the nanotube addition. <br /><br />Chapter 12<br />ISBN 0-8412-3887-1 |
| Publisher | American Chemical Society |
| Wikidata | |
| Citation | American Chemical Society (2005) 148-163 |
| DOI | https://doi.org/10.1021/bk-2005-0898.ch012 |
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