Authors Kroschwald, F. ; Müller, M. T. ; Pötschke, P. ; Nagel, J. ; Heinrich, G.
Title Electrical conductive surface functionalization of polycarbonate parts with CN composite films during injection molding
Date 27.04.2016
Number 47663
Abstract This study describes a reactive process to transfer an electrical conductive polycarbonate (PC) film onto the surface of bulk polycarbonate by an injection molding process using hyper branched poly (ethylenimine) (PEI). Due to a nucleophilic substitution reaction between the amino groups of the poly (ethylenimine) and the carbonate groups of the PC, a stable covalent crosslinking is established. The resulting conductive layer has an average thickness of about 3 -7 µm and a surface roughness that depends on the roughness of the cavity. The lowest resulting electrical surface resistivity of the final injection molded part of 5.58 · 104 O per square is measured for a composites film loaded with 5 wt.% CNT . The crosslinking PEI layer has a thickness of about 50 nm, which equates with the hydrodynamic radius of a random PEI molecule with molecular weight of about 750.000 g·mol-1. As a consequence, all PEI intermediate surface films remain completely on the PC parts.
Publisher Plastic and Polymer Technology (PAPT)
Citation Plastic and Polymer Technology (PAPT) 4 (2016) 41-52
Tags injection molding carbon nanotubes surface functionalization polymer matrix composites (pmcs) electrical properties

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