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Materials 2015, 8(9), 5730-5743;

Near Infrared Investigation of Polypropylene–Clay Nanocomposites for Further Quality Control Purposes—Opportunities and Limitations

Department of Polymer Engineering and Science, Chair of Polymer Processing, Montanuniversitaet Leoben, Otto Gloeckel Strasse 2, Leoben 8700, Austria
School of Engineering, Design and Technology, University of Bradford, Richmond Road, Bradford BD7 1DP, UK
Author to whom correspondence should be addressed.
Academic Editor: Biqiong Chen
Received: 17 June 2015 / Revised: 12 August 2015 / Accepted: 24 August 2015 / Published: 31 August 2015
(This article belongs to the Special Issue Polymer Nanocomposites)
Full-Text   |   PDF [3163 KB, uploaded 31 August 2015]   |  


Polymer nanocomposites are usually characterized using various methods, such as small angle X-ray diffraction (XRD) or transmission electron microscopy, to gain insights into the morphology of the material. The disadvantages of these common characterization methods are that they are expensive and time consuming in terms of sample preparation and testing. In this work, near infrared spectroscopy (NIR) spectroscopy is used to characterize nanocomposites produced using a unique twin-screw mini-mixer, which is able to replicate, at ~25 g scale, the same mixing quality as in larger scale twin screw extruders. We correlated the results of X-ray diffraction, transmission electron microscopy, G′ and G″ from rotational rheology, Young’s modulus, and tensile strength with those of NIR spectroscopy. Our work has demonstrated that NIR-technology is suitable for quantitative characterization of such properties. Furthermore, the results are very promising regarding the fact that the NIR probe can be installed in a nanocomposite-processing twin screw extruder to measure inline and in real time, and could be used to help optimize the compounding process for increased quality, consistency, and enhanced product properties. View Full-Text
Keywords: NIR spectroscopy; quality control; polypropylene nanocomposites NIR spectroscopy; quality control; polypropylene nanocomposites

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Witschnigg, A.; Laske, S.; Holzer, C.; Patel, R.; Khan, A.; Benkreira, H.; Coates, P. Near Infrared Investigation of Polypropylene–Clay Nanocomposites for Further Quality Control Purposes—Opportunities and Limitations. Materials 2015, 8, 5730-5743.

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