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Accelerated Silane Water‐Crosslinking Kinetics of Ethylene–Propylene Copolymer by Boron Trifluoride Complexes

The hydrolysis and overall water-crosslinking kinetics of vinyltrimethoxysilane-grafted ethylene-propylene copolymer (EPR-g-VTMS) containing boron trifluoride monoethylamine complex (BF 3 -MEA), boron trifluoride methanol complex (BF 3 -MeOH), or di-n-butyltin(II) dilaurate (DBTL) as a silane-crosslinking catalyst was followed by ATR-FT-IR and measuring the gel fraction, respectively. Kinetics results by ATR-FT-IR technique showed that using BF 3 -MEA provided much lower activation energy for the hydrolysis reactions than that of DBTL; however, BF 3 -MeOH had little catalytic effect on both the hydrolysis and overall water-crosslink reaction of EPR-g-VTMS. We propose that the actual catalytic effect of ethylamine molecule dissociated from BF 3 -MEA results in the displacement of Si-OCH 3 groups via an S N 2-Si mechanism.