SynopsisKinetics of the uptake of polypropylene by the cellulose were studied. According to the experimental results, the reaction begins with an induction period which cannot be explained on the basis of the reaction mechanism of Ziegler-Natta catalysts. Most probable reason of this period may be the initial unsaturation of the system.Studies on the effect of concentration of the catalyst (TiCL) showed that, above the order of magnitude of 10-2 mole/l, uptake of polypropylene by the cellulose is directly proportional to the concentration of Tic,. The maximum catalytic activity was observed at the molar ratio of ALEta to TiCL equal to 1.5.Concentration of propylene supported by the cellulose can be increased by elevation of the temperature.By increasing the concentration or the specific surface area of the cellulose a t a constant concentration of the cellulose a t a constant concentration of the catalyst, a kind of saturation appears on the cellulose fibers with respect to the adsorption of the metal chloride. Thus, increasing the specific surface area does not involve an increase in the uptake of polypropylene, in fact, increasing the concentration of the cellulose results in a drop in the amount of propylene to be taken up.On the basis of the infrared spectroscopical and the X-ray diffraction results, no differences were found between the mechanical mixture of the components and the cellulose fibers coated with polypropylene.Mechanical strength of paper sheets was poor compared with that of sheets from pure cellulose. Cellulose encapsulated with polypropylene can be used in the paper industry as an interlayer in laminated papers.
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