Abstract
The refined fluorosilicone microdroplets were introduced during the ethylene slurry polymerization to reduce the chain entanglement of ultra-high-molecular-weight polyethylene (UHMWPE) through the intermittent dormancy of living polymer chains. The dormancy effect is endowed by the highly frequent collisions between microdroplets and growing PE particles to block the transfer channel of reactants on the particle surface. The dwell time of microdroplets on the particle surface is an order of magnitude higher than that of the microbubbles, and the increase rate of the chain entanglement degree with the polymerization activity controlled by microdroplets is 2 orders of magnitude smaller than that of the microbubbles, indicating that fluorosilicone microdroplets have a better effect on the reduction of the chain entanglement. Compared with commercial products, the UHMWPE prepared in this work shows a lower chain entanglement degree and better mechanical properties, indicating that reducing the entanglement degree is one of the important means to improve the mechanical properties of UHMWPE.
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