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← ScienceWhich mechanism limits chain propagation rate for linear polyethylene production with a Ziegler-Natta catalyst?
A)Steric hindrance of monomer insertion✓
B)Catalyst poisoning via oxygen exposure
C)Chain transfer to aluminum alkyl
D)Beta-hydride elimination termination
💡 Explanation
Steric hindrance limits chain propagation because bulky catalyst ligands near the active site inhibit monomer insertion, therefore lowering reaction rate, rather than termination events controlling polymer molecular weight predominantly.
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