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Accelerated Silane Water‐Crosslinking Kinetics of Ethylene–Propylene Copolymer by Boron Trifluoride Complexes
Author(s) -
Adachi Kenta,
Hirano Tomoyuki,
Fukuda Katsuhito,
Nakamae Katsuhiko
Publication year - 2007
Publication title -
macromolecular reaction engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.37
H-Index - 32
eISSN - 1862-8338
pISSN - 1862-832X
DOI - 10.1002/mren.200600044
Subject(s) - boron trifluoride , silane , polymer chemistry , catalysis , copolymer , hydrolysis , chemistry , kinetics , ethylene , propylene oxide , methanol , ethylene propylene rubber , ethylene oxide , materials science , organic chemistry , polymer , physics , quantum mechanics
Abstract 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 SiOCH 3 groups via an S N 2‐Si mechanism.