Kinetics of curing reaction of urethane function on base-catalyzed epoxy reaction

Han, J. L.; Chern, Y. C.; Hsieh, K. H.; Chiu, Wen‐Yen; M., C. C.

doi:10.1002/(sici)1097-4628(19980404)68:1<121::aid-app13>3.0.co;2-3

Cited by 9 publications

(3 citation statements)

References 2 publications

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“…The obtained relationship of enthalpy changes versus the curing time is shown in Figure 4. The maximum reaction rate clearly occurred at time zero, and autoacceleration did not take place 22, 23. The conversion α ISO at time t and temperature T was calculated by the following equation:20 where the total heat, Δ H tot , of the isothermal reaction at temperature T was determined from the traditional dynamic mode.…”

Section: Resultsmentioning

confidence: 99%

Application of isothermal and model‐free isoconversional modes in DSC measurement for the curing process of the PU system

Vuorimaa

Lemmetyinen

2001

J of Applied Polymer Sci

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ABSTRACT:The dynamic, isothermal, and model-free isoconversional modes of differential scanning calorimetry measurement were used to monitor the curing process of the polyurethane system. Conversions obtained from these three methods were in good agreement with one another, indicating that isothermal and model-free isoconversional modes can successfully be used for monitoring the curing process. For the isothermal mode, the highest reaction rate occurred at time zero, and autoacceleration was not observed for this system. From the model-free isoconversional mode, it was possible to calculate the activation energy changes during the curing process.

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Section: Resultsmentioning

confidence: 99%

Application of isothermal and model‐free isoconversional modes in DSC measurement for the curing process of the PU system

Vuorimaa

Lemmetyinen

2001

J of Applied Polymer Sci

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“…There are several factors such as the reactant properties [8], the catalysts [9][10][11], the reactant concentration [12][13][14] and temperature [15,16] affecting the urethane reaction rate. The reaction medium is also one of the important factors in the urethane reaction.…”

Section: Introductionmentioning

confidence: 90%

The reaction of o-hydroxybenzyl alcohol with phenyl isocyanate in polar solvents

Han

Yang

et al. 2010

Reac Kinet Mech Cat

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The reaction of o-hydroxybenzyl alcohol with phenyl isocyanate has been investigated in different polar solvents with in situ FT-IR. The rate constants for the reactions of the phenolic hydroxyl group and the aliphatic hydroxyl group were calculated as k 1 and k 2 , respectively. It is found that the phenolic hydroxyl group reacts more easily than the aliphatic hydroxyl group. It is also found that k 1 increases with increasing solvent polarity, while the trend of k 2 is the opposite. Moreover, the reaction kinetics is second-order with respect to toluene, butyl acetate, cyclohexanone and pyridine, but is first-order with respect to NMP and DMF without distinction for the two kinds of hydroxyl groups.

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“…Upon thermal treatment of EPU, urethane NH groups can act as a nucleophile and attack to epoxy rings, therefore, new allophanate bonds and hydroxyl groups can be generated. The crosslinking reaction can be continued with the reaction of generated hydroxyl groups with unreacted epoxy groups (Scheme 3) [36]. Investigation of FTIR spectrum of EPU after curing reaction showed nearly complete reaction of epoxy groups, which was indicated by the disappearance of epoxy peaks at 864 and 913 cm 21 .…”

Section: Investigation and Optimization Of Network Formation By Dsc Amentioning

confidence: 99%

Synthesis and properties of polybenzoxazine modified polyurethanes as a new type of electrical insulators with improved thermal stability

Yeganeh

Razavi‐Nouri

Ghaffari

2008

Polymer Engineering & Sci

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A new class of electrical insulating materials with improved thermal stability was prepared from combination of polybenzoxazine with epoxy terminated polyurethane prepolymer (EPU). EPU was prepared by the reaction of glycidol with NCO-terminated urethane prepolymer. The prepolymer was prepared from polycaprolactone polyol (molecular weight 1000), and hexamethylene diisocyanate. Bisphenol-A and aniline were used for preparation of benzoxazine monomer. Mode of reactions and optimum curing condition were determined by DSC and FTIR analysis. Upon these analysis as well as DMTA findings, formation of interpenetrating polymer networks was suggested for blends consisted different weight ratios of two components. Viscoelastic behavior, mechanical, thermal, and electrical properties of the prepared samples was studied and their relation to the chemical structure and composition of blends were elucidated.

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Kinetics of curing reaction of urethane function on base-catalyzed epoxy reaction

Cited by 9 publications

References 2 publications

Application of isothermal and model‐free isoconversional modes in DSC measurement for the curing process of the PU system

Application of isothermal and model‐free isoconversional modes in DSC measurement for the curing process of the PU system

The reaction of o-hydroxybenzyl alcohol with phenyl isocyanate in polar solvents

Synthesis and properties of polybenzoxazine modified polyurethanes as a new type of electrical insulators with improved thermal stability

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