Abstract
A series of polypropylene/poly(ethylene-co-propylene) in-reactor alloys was prepared by a periodic switching polymerization process (PSPP) in which the monomer feed was periodically switched between pure propylene and an ethylene/propylene mixture using a commercial TiCl4/MgCl2/phthalate–Al(C2H5)3/DCPDMS Ziegler–Natta catalyst. In this work, the influence of the total time of gas phase PSPP (tgas) on the composition, morphology, and properties of the alloys were investigated. The rate of copolymer production was almost constant in the gas phase PSPP reaction for as long as 2 h, implying that the diffusion barrier does not significantly increase with tgas in the gas phase PSPP. By fractionating the PP/EPR alloys to three fractions, random ethylene/propylene copolymer (EPR), segmented ethylene/propylene copolymer (EPS), and isotactic polypropylene (iPP), it was found that the EPR and EPS content of the alloys increased with increasing tgas. The chain structure of the fractions also changed with an increase ...
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