A Comparative Study of the Preparation and Characterization of Aromatic and Aliphatic Bismaleimides to Produce Modified Siliconized Epoxy Intercrosslinked Matrices for Engineering Applications

Abstract

A novel hybrid intercrosslinked network of hydroxyl-terminated polydimethylsiloxane modified epoxy and bismaleimides [N,N′-bismaleimido-4,4′-diphenylmethane and 1,6-bis(maleimido)hexane] matrix systems were developed. Epoxy resin was modified with 5, 10, and 15% (wt%) of hydroxyl-terminated polydimethylsiloxane using γ-aminopropyltriethoxysilane as crosslinking agent and dibutyltindilaurate as catalyst. The reaction between hydroxyl-terminated polydimethylsiloxane and epoxy resin was confirmed by IR spectral studies. The siliconized epoxy systems were further modified with 5, 10, and 15% (wt%) of both aromatic and aliphatic bismaleimides separately. The castings and E-glass fiber-reinforced composites prepared were characterized for their mechanical properties. Differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA) of the matrix samples were also performed to determine the glass transition temperature (T g ) and thermal degradation temperature of the hybrid intercrosslinked systems. Data obtained from mechanical studies and thermal characterization indicate that the introduction of 561 ORDER REPRINTS ALAGAR, KUMAR, AND RAOsiloxane into epoxy resin improves the toughness and thermal stability, with reduction in strength and modulus values. The incorporation of aromatic bismaleimide into epoxy resin improved both tensile strength and thermal properties, whereas it was observed that the incorporation up to 5% of aliphatic bismaleimide into epoxy resin decreased the stress-strain value and above 5% increased the strength properties. However, the introduction of both aromatic and aliphatic bismaleimides (aromatic and aliphatic) into siliconized epoxy resin influenced both mechanical and thermal properties according to the percentage content.

Design and Development of Novel Flexible Bismaleimide Toughened Multi-Walled Carbon Nanotube Reinforced Epoxy Nanocomposites

“…It was noted that the siloxane moiety incorporated epoxy matrix enhances the impacts owing to stress-strain properties of a minor change in glass transition behavior 18,19 . Progressiveness in thermo-mechanical behaviors was attained due to the inclusion of BMI core into epoxy matrix [20][21][22][23][24] , siliconized epoxy 25 and unsaturated polyester resin 26 . BMIs are considered as a class of better temperature withstanding thermoset like polyimides and they find a wide range of applications in aerospace and electronics industries 27 .…”

Synthesis of a novel biphenyl epoxy resin and its hybrid composite with high thermal conductivity

“…Epoxy resin is a relatively new polymer material for electronic packaging with features of great stability, rigidity, and flexibility . However, modern electronic instruments develop quite fast in lots of areas today and the requirements of the functions are becoming much more meticulous and characteristic.…”

Hyperbranched polysiloxane‐based diglycidyl ether of bisphenol a epoxy composite for low k dielectric application

“…Epoxy resin is one of the most important thermosetting polymeric materials, which have been widely used as high‐performance adhesives, coatings, matrices for composites, and electronic encapsulating materials because of their outstanding adhesion to various surfaces, light weight, high strength, good durability, and high stability under ultraviolet exposure, excellent chemical resistance, and easy processing. They are used in aerospace, automobiles, land and marine transportation, chemical process industries, and electrical and electronic industries . However, the brittle behavior of epoxy resin restricts its utility for a number of high‐performance applications.…”

“…. Earlier, we have studied the development of epoxy‐based composites and nanocomposites and results show better improvement in thermal, thermomechanical, mechanical, and dielectric properties . However, in order to improve thermomechanical properties furthermore to utilize for high‐performance applications, it is proposed to use glycidyl‐terminated hyperbranched polysiloxane (HPSiE) as a modifier for DGEBA to obtain high‐performance DGEBA resin.…”