A reactive extrusion process for the free radical grafting of silanes onto polypropylene: Effects of processing conditions and properties of water cross-linked silane-grafted polypropylene

Authors

  • Zheng-Hui Li,

    1. CNRS-Universté de Lorraine, Laboratoire Réactions et Génie des Procédés, UPR3349, ENSIC, 1 rue Grandville, BP 20451, Nancy F-54000, France
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  • Guo-Hua Hu,

    Corresponding author
    1. CNRS-Universté de Lorraine, Laboratoire Réactions et Génie des Procédés, UPR3349, ENSIC, 1 rue Grandville, BP 20451, Nancy F-54000, France
    • CNRS-Universté de Lorraine, Laboratoire Réactions et Génie des Procédés, UPR3349, ENSIC, 1 rue Grandville, BP 20451, Nancy F-54000, France
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  • Jean-Pierre Corriou,

    1. CNRS-Universté de Lorraine, Laboratoire Réactions et Génie des Procédés, UPR3349, ENSIC, 1 rue Grandville, BP 20451, Nancy F-54000, France
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  • Sandrine Hoppe,

    1. CNRS-Universté de Lorraine, Laboratoire Réactions et Génie des Procédés, UPR3349, ENSIC, 1 rue Grandville, BP 20451, Nancy F-54000, France
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  • Christian Fonteix,

    1. CNRS-Universté de Lorraine, Laboratoire Réactions et Génie des Procédés, UPR3349, ENSIC, 1 rue Grandville, BP 20451, Nancy F-54000, France
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  • Richard Laine,

    1. CNRS-Universté de Lorraine, Laboratoire Réactions et Génie des Procédés, UPR3349, ENSIC, 1 rue Grandville, BP 20451, Nancy F-54000, France
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  • Jean Habimana,

    1. Multibase S.A., Z.I. Chartreuse-Guiers, Saint Laurent du Pont F-38380, France
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  • Damien Deheunynck

    1. Dow Corning Europe S.A., Rue Jules Bordet, Seneffe B-7180, Belgium
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Abstract

Silane grafting and water cross-linking of polypropylene (PP) are a recent method to modify its properties, such as melt strength, heat, and chemical resistance. This work aims at grafting silanes onto PP by reactive extrusion. The occurrence of the grafting of silane onto PP was confirmed by Fourier transform infrared (FTIR) and a method based on FTIR was developed to quantify the amount of polymerized silane and that of silane grafted onto PP. The molar mass of the silane-grafted PP and its melt viscosity were also measured. A multiobjective optimization strategy was used to study the effects of processing conditions on the quality of the silane-modified PP. It was concluded that to maximize the amount of silane grafted on PP and minimize the amount of polymerized silane and the decrease in PP chain scission, screw speed and barrel temperature should be low and feed rate high. POLYM. ENG. SCI., 2013. © 2013 Society of Plastics Engineers

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