引用本文:
Peng Fei Yang, Yan Hong Yu, Shun Ping Wang, Tian Duo Li. The amount effect of catalyst on the urethane reaction of o-hydroxybenzyl alcohol[J]. Chinese Chemical Letters,
2012, 23(2): 241-244.
doi:
10.1016/j.cclet.2011.10.013
Citation: Peng Fei Yang, Yan Hong Yu, Shun Ping Wang, Tian Duo Li. The amount effect of catalyst on the urethane reaction of o-hydroxybenzyl alcohol[J]. Chinese Chemical Letters, 2012, 23(2): 241-244. doi: 10.1016/j.cclet.2011.10.013
Citation: Peng Fei Yang, Yan Hong Yu, Shun Ping Wang, Tian Duo Li. The amount effect of catalyst on the urethane reaction of o-hydroxybenzyl alcohol[J]. Chinese Chemical Letters, 2012, 23(2): 241-244. doi: 10.1016/j.cclet.2011.10.013
The amount effect of catalyst on the urethane reaction of o-hydroxybenzyl alcohol
摘要:
The urethane reaction of o-hydroxybenzyl alcohol with phenyl isocyanate was monitored with in situ FT-IR. Dibutyltin dilaurate was used as catalyst and its amount effect was investigated. It was found that there was an obvious induction period before reaction began. It was interesting that the time of induction period climbed up and then declined with the increase of dibutyltin dilaurate. When the concentration of dibutyltin dilaurate reached 9.58×10-5 mol/L, the induction period disappeared completely and hereafter did not appear any more. Furthermore, the urethane reaction kinetics was studied. When the concentration of dibutyltin dilaurate increased, the reaction rate of phenolic group (k1) increased sharply, but the reaction rate of alcoholic group (k2) appeared of little change on the whole. K1 increased about 20-fold, yet k2 increased about 2-fold when the concentration of dibutyltin dilaurate varied from 9.58×10-6 mol/L to 1.92×10-4 mol/L, which made the value of k1/k2 enlarge.
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关键词:
- Urethane reaction
- / FT-IR
- / Dibutyltin dilaurate
- / Polymerization
English
The amount effect of catalyst on the urethane reaction of o-hydroxybenzyl alcohol
Abstract:
The urethane reaction of o-hydroxybenzyl alcohol with phenyl isocyanate was monitored with in situ FT-IR. Dibutyltin dilaurate was used as catalyst and its amount effect was investigated. It was found that there was an obvious induction period before reaction began. It was interesting that the time of induction period climbed up and then declined with the increase of dibutyltin dilaurate. When the concentration of dibutyltin dilaurate reached 9.58×10-5 mol/L, the induction period disappeared completely and hereafter did not appear any more. Furthermore, the urethane reaction kinetics was studied. When the concentration of dibutyltin dilaurate increased, the reaction rate of phenolic group (k1) increased sharply, but the reaction rate of alcoholic group (k2) appeared of little change on the whole. K1 increased about 20-fold, yet k2 increased about 2-fold when the concentration of dibutyltin dilaurate varied from 9.58×10-6 mol/L to 1.92×10-4 mol/L, which made the value of k1/k2 enlarge.
-
Key words:
- Urethane reaction
- / FT-IR
- / Dibutyltin dilaurate
- / Polymerization
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