1965 Volume 38 Issue 12 Pages 2045-2051
The thermal degradation of polypropylene in the presence of such vinyl polymers as polystyrene, polymethyl methacrylate, the 2-methyl-5-vinylpyridine-styrene copolymer, and the acrylonitrilestyrene copolymer has been studied at 280–345°C by the use of glass ampoules and an extruder.
1) The vinyl polymers added were effective as accelerators for the thermal degradation of polypropylene. The activation energies for the scission reaction of the polypropylene chain were 57.2 and 58.4 kcal./mol. for the two polypropylene samples, and 46.8, 43.5, 46.9 and 38.6 kcal./mol. for polypropylenes containing 3% polystyrene, 3% polymethyl methacrylate, 4.7% the acrylonitrilestyrene copolymer, and 3% the 2-methyl-5-vinylpyridine-styrene copolymer respectively.
2) The reaction time needed for the modification of polypropylene to an appropriate intrinsic viscosity by the use of an extruder is shorter than that in glass ampoules.
3) Graft or block polymers have been detected in the residue after the acetone-extraction of the extruded polypropylene. They could be used in the modification of the polypropylene dyeability.
4) It has been concluded that the simple process of the thermal degradation of polypropylene accelerated by vinyl polymers can be used for the modification of polypropylene with a very high molecular weight and, simultaneously, for the preparation of graft or block polymers.
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