In-situ monitoring by fibre-optic NIR spectroscopy and rheometry of maleic anhydride grafting to polypropylene in a laboratory scale reactive extruder

Moghaddam, Lalehvash, Rintoul, Llewellyn, Halley, Peter J., George, Graeme A. and Fredericks, Peter M. (2012) In-situ monitoring by fibre-optic NIR spectroscopy and rheometry of maleic anhydride grafting to polypropylene in a laboratory scale reactive extruder. Polymer Testing, 31 1: 155-163. doi:10.1016/j.polymertesting.2011.10.002


Author Moghaddam, Lalehvash
Rintoul, Llewellyn
Halley, Peter J.
George, Graeme A.
Fredericks, Peter M.
Title In-situ monitoring by fibre-optic NIR spectroscopy and rheometry of maleic anhydride grafting to polypropylene in a laboratory scale reactive extruder
Journal name Polymer Testing   Check publisher's open access policy
ISSN 0142-9418
1873-2348
Publication date 2012-02
Year available 2011
Sub-type Article (original research)
DOI 10.1016/j.polymertesting.2011.10.002
Volume 31
Issue 1
Start page 155
End page 163
Total pages 9
Place of publication Oxford, United Kingdom
Publisher Elsevier
Collection year 2012
Language eng
Abstract The graft copolymerisation of maleic anhydride (MAH) onto polypropylene (PP) has been studied in situ by interfacing a laboratory scale mini-extruder/processor with a near-infrared (NIR) spectrometer via a fibre optic link. Apparent viscosity was measured simultaneously with the NIR spectra. The graft reaction was carried out at several temperatures with and without the initiator, dicumyl peroxide (DCP). Analysis of the NIR spectra showed the reaction to be first order with respect to MAH, and that the graft reaction rate was not affected by the presence of DCP. However, DCP caused a large increase in chain scission reactions leading to a dramatic drop in apparent viscosity. In the absence of DCP, scission reactions occurred at a slower rate and the apparent viscosity remained steady, after an initial drop, for about 15 min during the early part of the reaction. We suggest that a possible explanation for this might be a “repair mechanism” involving the reaction of two PP macro-radicals with a single MAH moiety, thus maintaining the molecular weight. Once the concentration of MAH drops, this reaction becomes less significant and scission reactions dominate.
Keyword Graft polymerisation
Reactive extrusion
Maleic anhydride
Polypropylene
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Available online 15 October 2011

 
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