Rheological and kinetic study of diglycidyl ether of bisphenol-A (DGEBA)‎ cured with phenylenediamine

مقدم أطروحة جامعية

Kazim, Bashshar Jawad

مشرف أطروحة جامعية

Salih, Najat Jumah

الجامعة

الجامعة التكنولوجية

الكلية

-

القسم الأكاديمي

قسم الهندسة الكيمياوية

دولة الجامعة

العراق

الدرجة العلمية

ماجستير

تاريخ الدرجة العلمية

2011

الملخص الإنجليزي

-The cure process of epoxy resin diglycidyl ether of bisphenol-A (DGEBA) with aromatic amine (m-PDA) was studied by means of differential scanning calorimetry (DSC) Perkin Elmer Pyris 6, and Brookfield RV-II viscometer.

Isothermal DSC measurements were conducted between 80 and 110 oC, at 10 oC intervals.

The results show that the maximum cure reaction was achieved at 110 oC.

The maximum degree of cure at isothermal cure temperature 110 oC was 0.9.

The isothermal cure process was simulated with Kamal modifier with diffusion model, the model agrees well with the experimental data.

The glass transition temperature was also studied by DSC of each curing temperature, and the final glass transition temperature Tg∞ increase with increasing of degree of cure was observed.

The maximum temperature achieved was (117 oC.) at curing temperature 110 oC.

The dynamic cure process was different from the isothermal cure process.

For dynamic cure process, the activation energy was determined by two methods.

One was based on Kissinger and Ozawa approach, given only one activation energy for the whole curing process.

There was a slightly difference between the obtained activation energy and preexponential factor, 63.6 and 70.7 kJ mol-1 respectively.

Another method was based on isoconversional, given activation energy at any conversion, and observed the Ea decrease with increment conversion (67-63) KJ/mol.

Rheological properties of epoxy resin system are closely related to the cure process.

With the development of the cure reaction, gelation occurs and epoxy system becomes difficult to process.

It was found that the isothermal temperature increases, the gel time decreases.

The activation energy was calculated by Arrhenius law.

Viscosity profiles were described by Sun model.

The fitted results agreed well with the experimental values.

The critical time in the model decreases with increasing of the isothermal temperature.

The activation energies determined by the gel time, and critical time are close to each other 79.07 and 79.46 kJ mol-1 respectively.

The gel time obtained by DSC measurement different from those obtained fromrheological measurement.

التخصصات الرئيسية

الهندسة الكيميائية

• APA
• MLA
• AMA

لغة النص

الإنجليزية

نوع البيانات

رسائل جامعية

رقم السجل

BIM-305322