Abstract
The results presented here are for reaction conditions in which the rate of monomer diffusion into the polyethylene does not limit the rate of graft polymerization. This was established by observing the reaction rate experimentally as independent of polymer film thickness for films 0.002 and 0.003 in. thick. Thus the graft polymerization rates for 100% styrene at 0.037 Mrad/hr are 0.128 and 0.121%/min, respectively, for film thicknesses of 0.002 and 0.003 in. It was earlier proven to obtain the order of dependence of rate on monomer it is necessary that the styrene concentration be varied without altering the internal microviscosity of the reaction system. This was accomplished by using benzene as a diluent for styrene. The extent of swelling (and therefore the internal microviscosity) of polyethylene by styrene--benzene solutions was experimentally observed to be 8.0% independent of composition. Furthermore, the composition of the styrene--benzene solution absorbed into the polyethylene films by refractive index measurements was experimentally analyzed. 3 figures.
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