Polyurethanes end-capped with some trialkoxysilanes, such as trimethoxysilane, triethoxysilane, tripropoxysilane, and tributoxysilane (silylated polyurethanes), were synthesized. Boron trifluoride/monoethytamine (BF3-MEA) complex and dibutyltin dimethoxide (DBTDM) were examined as curing catalysts for the obtained silylated polyurethanes to compare their curing speeds. It was found that BF3-MEA worked as a more efficient catalyst for the condensation reaction of the alkoxysilyl groups in the silylated polyurethanes to form the corresponding networked polyurethanes. BF3-MEA had a great advantage as one of the curing catalysts because it gave a fast curing speed for the silylated polyurethanes having long alkoxysilyl groups (ethoxy, propoxy, and butoxy) in comparison with DBTDM. (c) 2008 Wiley Periodicals, Inc.