A study on the effect of the hardener on the mechanical properties of the epoxy resin

Dissertant

Aziz, Maryam Imad

Thesis advisor

Abd al-Razzaq, Adnan A.
Salih, Najat Jumah

University

University of Technology

Faculty

-

Department

Department of Chemical Engineering

University Country

Iraq

Degree

Master

Degree Date

2010

English Abstract

Triethylene tetra mine (TETA) and diamino diphenyl methane (DDM) were prepared with different hardener / resin ratios, (under stoichiometry, stoichiometry and above stoichiometry) and their mechanical properties; cure kinetics and rheology were investigated by using mechanical tests, thermal and rheological analysis.

Impact strength, tensile strength, hardness, flexural strength, compression strength and bending strength were measured through using mechanical tests instruments.

The tests were carried out at room temperature.

For DGEBA/TETA system the tests were done on four hardener / resin ratios (10, 13, 15 and 20) phr and for DGEBA/DDM system the hardener/resin ratios were four also ; (24, 27, 30 and 34) phr.

The results showed that the above stoichiometry ratio formulation (15 phr for DGEBA / TETA system and 30 phr for DGEBA/DDM system) gave the best mechanical properties.

While the DGEBA/DDM system showed better mechanical properties than the DGEBA / TETA system From dynamic and isothermal runs of the DGEBA / TETA system for three hardener / resin ratios (5, 13and 20) phr, the cure kinetics at four temperatures (30, 45, 60 and 80) °C was analyzed by a differential scanning calorimetric (DSC).

The isothermal cure process was simulated with the four-parameter autocatalytic with diffusion model (modified Kamal’s model).

The fitted results agreed well with the experimental values in the late and early cure stages.

The results showed that the stoichiometric ratio (13 phr) reaches complete cure (α = 1) at 80 °C.

Viscosity (η) of DGEBA / TETA system was measured through curing using a Brookfield viscometer at four different temperatures (30, 45, 60 and 80) °C.

The measurements were carried out for three hardener / resin ratios (5, 13 and 20) phr.

The gel time (tgel) 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.

Main Subjects

Chemistry

Topics

• Mechanical properties

• APA
• MLA
• AMA

Language

English

Data Type

Arab Theses

Record ID

BIM-305043