Curing Kinetic Analysis and Isothermal Prediction of DBTL Catalyzed Polyurethane Reaction by Differential Scanning Calorimetry

Seçil Sevim Ünlütürk

Makale detayları

Curing Kinetic Analysis and Isothermal Prediction of DBTL Catalyzed Polyurethane Reaction by Differential Scanning Calorimetry

Yazarlar:

Seçil Sevim Ünlütürk

Yayıncı:

Turkish Chemical Society

Ana Başlıklar:

Reaction Kinetics and Dynamics

Dergi:

Journal of the Turkish Chemical Society Section A: Chemistry Vol.11 Issue 3, pp.1211-1226

Belge Tipi:

Makale

Yayın Tarihi:

8/2024

Belge Dili:

İngilizce

Document ID (Org No.):

2001317700

pISSN:

2149-0120

Anahtar kelimeler:

Özet:

 Kinetic analysis is generally carried out to clarify the reaction mechanism with kinetic parameters and to predict the kinetic properties of materials under different reaction parameters. The kinetics of the polyurethane polymerisation reaction between acrylic polyol and isocyanate was investigated by Differential Scanning Calorimetry DSC in terms of catalyst amounts and sampling times. Single and multiple heating analyses were used to obtain DSC curves for each sample. The simple kinetic model and Multilinear Regression Fit MRF were used to calculate the kinetic parameters and simulate the isotherm prediction curves. The kinetic calculations showed that the glass transition temperatures up to 44 oC and activation energy Ea values increased with the degree of conversion for all cases. The reduction in the rate constant for partially cured samples was greater than the initial sampling time of the same sample. This observation indicates that the diffusion-controlled reaction dominates and Ea increases due to the highly cross-linked and dense medium in partially cured samples. Isothermal prediction curves provide an understanding of different curing conditions at different reaction temperatures and times. Prediction curves show slower conversion even for final samples, confirming that final samples may remain uncured. Applying the results of this study, especially for real-world applications, where fully cured samples are required, additional annealing procedures can be easily established.

 Kinetic analysis is generally carried out to clarify the reaction mechanism with kinetic parameters and to predict the kinetic properties of materials under different reaction parameters. The kinetics of the polyurethane polymerisation reaction between acrylic polyol and isocyanate was investigated by Differential Scanning Calorimetry DSC in terms of catalyst amounts and sampling times. Single and multiple heating analyses were used to obtain DSC curves for each sample. The simple kinetic model and Multilinear Regression Fit MRF were used to calculate the kinetic parameters and simulate the isotherm prediction curves. The kinetic calculations showed that the glass transition temperatures up to 44 oC and activation energy Ea values increased with the degree of conversion for all cases. The reduction in the rate constant for partially cured samples was greater than the initial sampling time of the same sample. This observation indicates that the diffusion-controlled reaction dominates and Ea increases due to the highly cross-linked and dense medium in partially cured samples. Isothermal prediction curves provide an understanding of different curing conditions at different reaction temperatures and times. Prediction curves show slower conversion even for final samples, confirming that final samples may remain uncured. Applying the results of this study, especially for real-world applications, where fully cured samples are required, additional annealing procedures can be easily established.

 Kinetic analysis is generally carried out to clarify the reaction mechanism with kinetic parameters and to predict the kinetic properties of materials under different reaction parameters. The kinetics of the polyurethane polymerisation reaction between acrylic polyol and isocyanate was investigated by Differential Scanning Calorimetry DSC in terms of catalyst amounts and sampling times. Single and multiple heating analyses were used to obtain DSC curves for each sample. The simple kinetic model and Multilinear Regression Fit MRF were used to calculate the kinetic parameters and simulate the isotherm prediction curves. The kinetic calculations showed that the glass transition temperatures up to 44 oC and activation energy Ea values increased with the degree of conversion for all cases. The reduction in the rate constant for partially cured samples was greater than the initial sampling time of the same sample. This observation indicates that the diffusion-controlled reaction dominates and Ea increases due to the highly cross-linked and dense medium in partially cured samples. Isothermal prediction curves provide an understanding of different curing conditions at different reaction temperatures and times. Prediction curves show slower conversion even for final samples, confirming that final samples may remain uncured. Applying the results of this study, especially for real-world applications, where fully cured samples are required, additional annealing procedures can be easily established.

 Kinetic analysis is generally carried out to clarify the reaction mechanism with kinetic parameters and to predict the kinetic properties of materials under different reaction parameters. The kinetics of the polyurethane polymerisation reaction between acrylic polyol and isocyanate was investigated by Differential Scanning Calorimetry DSC in terms of catalyst amounts and sampling times. Single and multiple heating analyses were used to obtain DSC curves for each sample. The simple kinetic model and Multilinear Regression Fit MRF were used to calculate the kinetic parameters and simulate the isotherm prediction curves. The kinetic calculations showed that the glass transition temperatures up to 44 oC and activation energy Ea values increased with the degree of conversion for all cases. The reduction in the rate constant for partially cured samples was greater than the initial sampling time of the same sample. This observation indicates that the diffusion-controlled reaction dominates and Ea increases due to the highly cross-linked and dense medium in partially cured samples. Isothermal prediction curves provide an understanding of different curing conditions at different reaction temperatures and times. Prediction curves show slower conversion even for final samples, confirming that final samples may remain uncured. Applying the results of this study, especially for real-world applications, where fully cured samples are required, additional annealing procedures can be easily established.

Makale detayları

Curing Kinetic Analysis and Isothermal Prediction of DBTL Catalyzed Polyurethane Reaction by Differential Scanning Calorimetry

Yazarlar: Seçil Sevim Ünlütürk

Yayıncı: Turkish Chemical Society

Ana Başlıklar: Reaction Kinetics and Dynamics

Dergi: Journal of the Turkish Chemical Society Section A: Chemistry Vol.11 Issue 3, pp.1211-1226

Belge Tipi: Makale

Yayın Tarihi: 8/2024

Belge Dili: İngilizce

Document ID (Org No.): 2001317700

pISSN: 2149-0120

Polyurethane

Curing Kinetic

Differential Scanning Calorimetry

Sayı

Yazarlar:

Seçil Sevim Ünlütürk

Yayıncı:

Turkish Chemical Society

Ana Başlıklar:

Reaction Kinetics and Dynamics

Dergi:

Journal of the Turkish Chemical Society Section A: Chemistry Vol.11 Issue 3, pp.1211-1226

Belge Tipi:

Makale

Yayın Tarihi:

8/2024

Belge Dili:

İngilizce

Document ID (Org No.):

2001317700

pISSN:

2149-0120