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Methyl methacrylate modification of polyolefin in a batch mixer and a twin‐screw extruder experiment and kinetic model
Author(s) -
Cha Jaehyug,
White James L.
Publication year - 2003
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.10155
Subject(s) - methyl methacrylate , materials science , grafting , maleic anhydride , polymer chemistry , monomer , plastics extrusion , polypropylene , polyolefin , peroxide , methacrylate , poly(methyl methacrylate) , static mixer , chemical engineering , copolymer , composite material , polymer , viscosity , chemistry , organic chemistry , layer (electronics) , engineering
Free radical grafting with methyl methacrylate onto molten polypropylene was investigated in both an internal mixer and a modular co‐rotating twin‐screw extruder. There has been little open literature on melt free radical grafting copolymerization of methyl methacrylate. There is also little information on the evolution of grafting reaction with respect to reaction time in an internal mixer and along the screw axes with methyl methacrylate. The influence of residence time on the degree of grafting in an internal mixer and a twin‐screw extruder was studied through measuring reaction yields with respect to reaction time in a mixer and evolution of reaction yield along the screw axis. The degree of grafting increased with initial monomer and peroxide concentration. The grafting reactions with three different peroxides were also investigated. The grafting levels were similar to maleic anhydride and suggested that only an individual methyl methacrylate unit be grafted. The melt viscosity was dramatically reduced with addition of peroxide. A kinetic scheme of our reaction system for methyl methacrylate was proposed and compared with the experimental results.