Reactive extrusion is an attractive means of polymer processing since the shaping and reaction take place in a single operation. In this paper we report the silane grafting of polyethylenes in a single screw extruder. The optimum conditions for silane grafting, viz. temperature, shear rate, silane and DCP concentrations, were determined on a torque rheometer and then actual extrusion was performed using these conditions. The study shows that an optimum low level of grafting/crosslinking can be introduced into polyethylene during its extrusion for better mechanical behavior and/or thermal stability without affecting the processability.
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Isac et al. (2005) studied this question.
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