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- W2886761661 abstract "AbsractCatalysis of cure reaction of ɛ-caprolactam-blocked polyisocyanate with 1,4-butane diol in the presence of DABCO - a tertiary amine, tin(II) 2-ethylhexanoate and non-tin organometallics like bismuth neodecanoate, calcium(II) 2-ethylhexanoate and zinc(II) 2-ethylhexanoate was investigated. The activity of these catalysts was studied by the determination of cure-time (gel-time) and analysis of absolute molecular weight of cured polymers. Cure-time results indicated that all the non-tin organometallics act as catalysts; they were more active than DABCO and except bismuth neodecanoate, other two non-tin compounds were also found to be equally active or more active than tin(II) 2-ethylhexanoate. Within the three organometallics studied, zinc (II) 2-ethylhexanoate showed highest catalytic activity, it reduced the cure-time more than 50% compared to the uncatalysed reaction. In the case of bismuth neodecanoate catalysed reaction, it was found that the viscosity was build-up to a certain limit and then decreased; this catalyst assisted chain degradation was confirmed by the analysis of molecular weight of polymers as a function of time. Catalytically active new species was formed when mixing the solution of DABCO to the solution of zinc (II) 2-ethylhexanoate and this formation was confirmed using FT-IR and UV-visible spectroscopy, but this species not showed synergism." @default.
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- W2886761661 date "2018-07-03" @default.
- W2886761661 modified "2023-10-17" @default.
- W2886761661 title "Catalysis of cure reaction of ɛ-caprolactam-blocked polyisocyanate with diol using non-tin catalysts" @default.
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- W2886761661 doi "https://doi.org/10.1080/10601325.2018.1481346" @default.
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