Abstract
The synthesis of thermally stable Tetra-di-glycidyl ether bisphenol-A (TDGEBA) Epoxy resin and Sulphanilamide (SAA) have been synthesized from (SAA) and TDGEBA by in situ polymerization technique to obtain Te-tra-di-glycidyl ether bisphenol-A Sulphanilamide (TDGEBA/SAA) Epoxy resin and modified with various per-centages of polyester (PE) to obtain Tetra diglycidyl ether bisphenol-A Sulphanilamide polyester (TDGEBA/SAA-PE), highly cross-linked thermosetting polymer network. These materials were cured with triethylenetetramine TETA (hardener) to obtain highly cross-linked thermosetting resin. The physical properties of the resulting blends were evaluated by measuring the impact strength of (TDGEBA/SAA-PE) (increased more than 30% than the unmodified epoxy resin) and hardness that is found to be higher than unmodified epoxy resin. Differential scanning calorimetry (DSC) and thermo gravimetric (TGA) analysis were also cured to assess the thermal behavior of the samples. DSC of the (TDGEBA/SAA) Epoxy resin cured with TETA showed exothermic reactions and the glass transition temperature (Tg) shifted from 350℃ to 400℃compared with uncured epoxy and the thermal stability of the TDGEBA/SAA epoxy resin modified increased with increasing of PE. Scanning Electron Microscopy (SEM) studied the morphology of the samples after unnotched impacts on fracture surfaces. These materials exhibited a higher degree of solvent resistance.
Highlights
The modern technology development needs reliable high-performance composite materials of lightweight with excellent thermal and mechanical properties
A set of Epoxy resins have been synthesized by adding aromatic amine such as Sulphanilamide
The solvent resistance and impact strength increased initially up to a Tetra-di-glycidyl ether bisphenol-A (TDGEBA)/SAA epoxy resin with PE mixture ratio of 40:60 (w/w), increased more than 30% than the unmodified epoxy resin) and hardness that is found to be higher than unmodified epoxy resin
Summary
The modern technology development needs reliable high-performance composite materials of lightweight with excellent thermal and mechanical properties. Epoxy resins based on diglycidyl ether of bisphenol-A have been used extensively as thermosetting materials in the development of high-performance lightweight fiber reinforced composites. Epoxy resin exhibits many desirable properties, such as high strength and modulus, excellent chemical and solvent resistance, good thermal and electrical properties and outstanding adhesions [1]-[8]. Cured epoxy resins are generally brittle and they exhibit inferior weathering resistance. These are the major factors that inhibit further proliferation of epoxy resin into many advanced industrial application and these have resulted in many studies devoted to toughening them without compromising their stress-strain and thermal properties
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