In Situ FT-IR Studies on the Catalytic Reaction of Isophorone Diisocyanate with Benzyl Alcohol

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.476-478.2197 ◽

2012 ◽

Vol 476-478 ◽

pp. 2197-2200

Author(s):

Peng Fei Yang

Keyword(s):

Benzyl Alcohol ◽

Rate Constant ◽

Dibutyltin Dilaurate ◽

Activation Entropy ◽

Isophorone Diisocyanate ◽

Ir Studies ◽

Initial Stage ◽

Different Temperatures ◽

Ft Ir

Benzyl alcohol is used to react with isophorone diisocyanate at different temperatures. Dibutyltin dilaurate is used as catalyst. In-situ FT-IR is used to monitor the reaction to work out rate constant, Arrhenius equation and Eyring equation. The urethane reaction has been found to be a second order reaction, and the rate constant seems different between initial stage and final stage. The activation energy (Ea), activation enthalpy (ΔH) and activation entropy (ΔS) for the urethane reaction of different isocyanates groups are respectively calculated out, which are very useful to reveal the reaction mechanism.

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In Situ FT-IR Studies on the Amine-Catalyzed Urethane Reaction Kinetics of 1,3-Butanediol

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.472-475.2223 ◽

2012 ◽

Vol 472-475 ◽

pp. 2223-2226

Author(s):

Peng Fei Yang

Keyword(s):

Rate Constant ◽

Phenyl Isocyanate ◽

Hydroxyl Group ◽

Activation Entropy ◽

Ir Studies ◽

Initial Stage ◽

Different Temperatures ◽

Ft Ir ◽

Kinetics Of

Phenyl isocyanate is used to react with 1,3-butanediol at different temperatures. Toluene is used as solvent and 1,4-diazabicyclo[2,2,2]octane is used as catalyst. In-situ FT-IR is used to monitor the reaction to work out rate constant, Arrhenius equation and Eyring equation. The urethane reaction has been found to be a second order reaction, and the rate constant seems different between initial stage and final stage. The activation energy (Ea), activation enthalpy (ΔH) and activation entropy (ΔS) for the urethane reaction of primary hydroxyl group are calculated out, which are 26.4 kJ•mol-1, 23.6 kJ•mol-1and -186.6 J•mol-1•k-1, respectively. They are very useful to reveal the reaction mechanism.

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In Situ FT-IR Studies on the Catalytic Reaction Kinetics of 1,2-Propanediol with Phenyl Isocyanate

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.450-451.131 ◽

2012 ◽

Vol 450-451 ◽

pp. 131-134

Author(s):

Peng Fei Yang

Keyword(s):

Rate Constant ◽

Arrhenius Equation ◽

Phenyl Isocyanate ◽

Activation Entropy ◽

Ir Studies ◽

Initial Stage ◽

Different Temperatures ◽

Ft Ir ◽

Kinetics Of

Phenyl isocyanate is used to react with 1,2-propanediol in different temperatures. Toluene is used as solvent and triethylamine is used as catalyst. In-situ FT-IR is used to monitor the reaction to work out rate constant, Arrhenius equation and Eyring equation. The urethane reaction has been found to be a second order reaction, and the rate constant seems different between initial stage and final stage. The activation energy (Ea), activation enthalpy (ΔH) and activation entropy (ΔS) for the urethane reaction are calculated out, which are 74.1 kJ•mol-1, 71.3 kJ•mol-1 and -30.5 J•mol-1•k-1, respectively. They are very useful to reveal the reaction mechanism.

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In Situ FT-IR Studies on the Urethane Reaction Kinetics of 3-Methyl-1,3-Butanediol in Nitrogen-Contained Solvent

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.446-449.1743 ◽

2012 ◽

Vol 446-449 ◽

pp. 1743-1746

Author(s):

Peng Fei Yang

Keyword(s):

Rate Constant ◽

Phenyl Isocyanate ◽

Hydroxyl Group ◽

Activation Entropy ◽

Ir Studies ◽

Initial Stage ◽

Different Temperatures ◽

Ft Ir ◽

Kinetics Of

Phenyl isocyanate is used to react with 3-methyl-1,3-butanediol at different temperatures. Dimethylformamide is used as solvent. In-situ FT-IR is used to monitor the reaction to work out rate constant, Arrhenius equation and Eyring equation. The urethane reaction has been found to be a second order reaction, and the rate constant seems different between initial stage and final stage. The activation energy (Ea), activation enthalpy (ΔH) and activation entropy (ΔS) for the urethane reaction of tertiary hydroxyl group are calculated out, which are 75.2 kJ•mol-1, 72.4 kJ•mol-1and -44.8 J•mol-1•k-1, respectively. They are very useful to reveal the reaction mechanism.

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In Situ FT-IR Studies on the Urethane Reaction Kinetics of 1,3-Butanediol in Nitrogen-Contained Solvent

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.472-475.1911 ◽

2012 ◽

Vol 472-475 ◽

pp. 1911-1914

Author(s):

Peng Fei Yang

Keyword(s):

Rate Constant ◽

Phenyl Isocyanate ◽

Hydroxyl Group ◽

Activation Entropy ◽

Ir Studies ◽

Initial Stage ◽

Different Temperatures ◽

Ft Ir ◽

Kinetics Of

Phenyl isocyanate is used to react with 1,3-butanediol at different temperatures. Dimethylformamide is used as solvent. In-situ FT-IR is used to monitor the reaction to work out rate constant, Arrhenius equation and Eyring equation. The urethane reaction has been found to be a second order reaction, and the rate constant seems different between initial stage and final stage. The activation energy (Ea), activation enthalpy (ΔH) and activation entropy (ΔS) for the urethane reaction of primary hydroxyl group are calculated out, which are 90.9 kJ•mol-1, 88.2 kJ•mol-1and 20.2 J•mol-1•k-1, respectively. They are very useful to reveal the reaction mechanism.

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Kinetic Studies on the Polymerization of Dicyclohexylmethylmethane-4,4'-Diisocyanate with Polyoxytetramethylene Diol

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.791-793.32 ◽

2013 ◽

Vol 791-793 ◽

pp. 32-35

Author(s):

Jian Cheng Wang

Keyword(s):

Rate Constant ◽

Arrhenius Equation ◽

Activation Enthalpy ◽

Kinetic Studies ◽

Activation Entropy ◽

Dimethyl Acetamide ◽

Different Temperatures ◽

Ft Ir ◽

Temperature Activation

Dicyclohexylmethylmethane-4,4'-diisocyanate is used to react with polyoxytetramethylene diol at different temperatures. N,N-Dimethyl acetamide is used as solvent.In situFT-IR is used to monitor the reaction to work out rate constant, Arrhenius equation and Eyring equation. The polymerization has been found to be a second order reaction, and the rate constant increases with the rise of temperature. Activation energy (Ea), activation enthalpy (ΔH) and activation entropy (ΔS) for the polymerization are respectively calculated out, which are very useful to reveal the reaction mechanism.

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Effects of Solvent Polarity on the Urethane Reaction of 1,2-Propanediol

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.450-451.38 ◽

2012 ◽

Vol 450-451 ◽

pp. 38-41

Author(s):

Peng Fei Yang

Keyword(s):

Rate Constant ◽

Solvent Polarity ◽

Reaction Rates ◽

Phenyl Isocyanate ◽

Second Order Reaction ◽

Polar Solvents ◽

Initial Stage ◽

Ft Ir ◽

Kinetics Of

The urethane reaction kinetics of 1,2-propanediol with phenyl isocyanate are investigated in different solvents, such as xylene, toluene and dimethylformamide. In-situ FT-IR is used to monitor the reaction to work out rate constant. It showsthat the urethane reaction has been found to be a second order reaction, solvents largely affects reaction rates. The reaction is largely accelerated in polar solvents, following the order of dimethylformamide > toluene > xylene. Further more, when dimethylformamide is used as solvent, the rate constants are different between initial stage and final stage, which belongs to different hydroxyls in 1,2-propanediol. However, when toluene or xylene is used as solvent, the rate constant is the same. That is, there is no reactivity difference for hydroxyls in 1,2-propanediol.

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Catalytic Effect of Triethylamine on the Urethane Reaction of Asymmetry Diol

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.472-475.1837 ◽

2012 ◽

Vol 472-475 ◽

pp. 1837-1840

Author(s):

Peng Fei Yang

Keyword(s):

Rate Constant ◽

Catalytic Effect ◽

Reaction System ◽

Phenyl Isocyanate ◽

Order Reaction ◽

Second Order Reaction ◽

Initial Stage ◽

Ft Ir ◽

Kinetics Of

The urethane reaction kinetics of 1,2-propanediol and 1,3-butanediol with phenyl isocyanate are investigated in toluene. In-situ FT-IR is used to monitor the reaction to work out rate constant. The urethane reaction has been found to be a second order reaction and is largely accelerated with triethylamine as catalyst. Furthermore, the rate constants are different between initial stage and final stage when triethylamine is used as catalyst, which belongs to different hydroxyls in asymmetry diol. However, when there is no catalyst in the reaction system, the rate constant is the same. That is, there is no reactivity difference for hydroxyls in asymmetry diol. Moreover, 1,3-butanediol is more active than 1,2-propanediol when reacting with isocyanate.

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