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The Rheological Properties of Isothermal Curing of DGEBA/ TETA Epoxy System
دراسة الخواص الريولوجية بثبوت درجة الحرارة لعملية تقسية راتنج الايبوكسي بأستخدم مادة تراي اثلين تترا امين

Authors: Adnan A. Abdul Razak --- Najat j. Saleh --- Maryem Emad
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2015 Volume: 33 Issue: 5 Part (A) Engineering Pages: 1095-1112
Publisher: University of Technology الجامعة التكنولوجية

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Abstract

In this study viscosity (η) of diglycidyl ether of bisphenol A / triethylenetetramine (DGEBA/TETA) system were measured through curing using a Brookfield viscometer at four different temperatures (30, 45, 60 and 80) °C. The measurements were carried out for two hardener/resin ratios (13 and 20) phr. The gel time was calculated for each hardener/resin ratio formulation; from the viscosity experimental data. The results showed that the gel time decrease with increasing curing temperature for each hardener/resin ratio formulation. Viscosity profiles were described by a model based on the Boltzmann function. The fitted results agreed well with the experimental values.

في هذا البحث تم قياس اللزوجة لنظام مكون من (DGEBA/TETA ) خلال عملية الانضاج بأستخدام مقياس اللزوجة من نوع Brookfieldفي اربع درجات مختلفة (30,45,60,80) م0 . تم أخذ القياسات باستخدام نسبتين للراتنج / المصلد وهما (13) و(20) جزء من المائة .تم حساب زمن التصلب gel time)) لكل نسبة من الراتنج/ المصلد من قياسات اللزوجة . أظهرت النتائج بان زمن التصلد يزداد مع زيادة درجة الانضاج لكل نسبة من نسب الراتنج/ المصلد . تم وصف منحنى اللزوجة بموديل يعتمد على موديل (Boltzman) وتم مطابقة النتائج المستخلصة من الموديل مع النتائج المختبرية وظهر تطابق كبير بينهما .

Keywords

Epoxy Resin --- Curing --- Rheology --- Hardener


Article
Cure Kinetics of Epoxy Resin Studied by Dynamics and Isothermal DSC Data

Authors: Adnan A. Abdul Razak --- Najat j. Saleh --- Maryem Emad
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2016 Volume: 34 Issue: 9 Part (A) Engineering Pages: 1731-1743
Publisher: University of Technology الجامعة التكنولوجية

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Abstract

Diglycidyl ether of bisphenol A(DGEBA) epoxy resin was cured withhardeners aliphatic amine triethylenetetramine (TETA). Differential scanning calorimetry (DSC) technique was utilized to study the kinetics of cure of (DGEBA)-(TETA) system,diverse hardener/resin ratios werestudied, (5, 13and 20) phr. Isothermal as wellas dynamic experiments were carried out of the above mentioned DGEBA/TETA system with three hardener/resin ratios, and cure kinetics were investigated at four temperatures (30, 45, 60 and 80) °C using (DSC) technique. The process of isothermal cure was simulated by the diffusion model (modified Kamal’s model and four-parameter autocatalytic model. The obtainedoutcomes are in good agreement with the experimental results in the early andlate cure stages. The eventsdeclare that complete cure at 80 °C attains atthe stoichiometric ratio (13 phr).

Keywords

Epoxy resin --- DGEBA --- Cure kinetics --- DSC

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