Investigation of the kinetics of epoxy resin hardening by a method which excludes their reaction with the material of the container

Noskov, A. M.; Gogolev, V. N.

doi:10.1007/bf00617294

Cited by 1 publication

(1 citation statement)

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“…As observed, the best correlation with experimental measurements was obtained in the 1155–1210 nm range, and this was used for further evaluation of the oxirane content. This wavelength interval is related to the second overtone of a carbon-hydrogen stretching vibration of an oxirane ring. , In the case of the HOPO-based polyols, the corresponding NIR absorption spectra are presented in Figure S2 in the Supporting Information. The best correlation with the hydroxyl value obtained from titration was observed within the 2038 to 2092 nm interval.…”

Section: Results and Discussionmentioning

confidence: 99%

Natural Oil Polyol from High-Oleic Palm Oil─Reaction Kinetics and Monitoring Using Near-Infrared Spectroscopy

Bohórquez,

Orjuela,

Solarte

et al. 2023

Ind. Eng. Chem. Res.

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Natural oil polyols are widely used biobased monomers for the manufacture of polymers and resins. They are mainly produced via hydroxylation of epoxidized vegetable oils. This work studied the kinetics of hydroxylation of epoxidized high-oleic palm oil via oxirane ring cleavage with ethylene glycol (EG). Experiments were performed at different temperatures (65−95 °C), hydroxyl-to-oxirane mol ratios (1.75−14), and catalyst loadings (H 2 SO 4 , 0.5−4% wt). The reaction was monitored by measuring the hydroxyl value and oxirane oxygen content in samples using near-infrared absorbance. Different power-law kinetic expressions were evaluated, and the lower average error (3.25%) resulted in first order with respect to epoxide, second order with respect to EG, and considering oligomers formation. The corresponding frequency factor and energy of activation for hydroxylation were 3.58 × 10 4 and 51.9 kJ/mol, and those for oligomerization were 3.32 × 10 5 and 67.2 kJ/mol, respectively. The obtained model is suitable for further process design and scale up.

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Section: Results and Discussionmentioning

confidence: 99%