Effect of carboxyl‐terminated butadiene acrylonitrile copolymer concentration on mechanical and morphological features of binary blends of nonglycidyl‐type epoxy resins

Abstract

Blend samples were prepared by physical blending of nonglycidyl-type epoxy resin with varying weight ratios of carboxyl-terminated butadiene acrylonitrile (CTBN) copolymer ranging between 0 and 25 wt%. The blend samples were cured with stoichiometric quantity of diamine. A comparative study of prepared blend samples by Fourier transform infrared (FTIR) spectroscopy showed the modification as a result of chemical reactions between cycloaliphatic epoxy, CTBN, and 4,4 -diamino diphenyl sulfone. The impact strength of the blend systems increased up to 15 wt% addition of CTBN in the blend and decreased thereafter. The toughness and elongation at break increased, whereas tensile strength decreased up to 20 wt% loading of CTBN in the blends. Two-phase morphology appeared with the incorporation of CTBN in the cycloaliphatic epoxy resin matrix.

Effect of Hybridization of Carboxyl‐Terminated Acrylonitrile Butadiene Liquid Rubber and Alumina Nanoparticles on the Fracture Toughness of Epoxy Nanocomposites

“…The addition of CTBN into epoxy, could activate the chemical reaction between carboxyl functional group of the CTBN and epoxy group of the resin. This could decrease the intensity of the peaks at 915 and 830 cm −1 . The intensity of [sbond]C[tbond]N absorption peak at 2,237 cm −1 , appeared in the spectrum of UEC15, was decreased compared with that of CTBN, which was probably due to the lower volume fraction of CTBN in the sample .…”

“…This could decrease the intensity of the peaks at 915 and 830 cm −1 [11,35]. The intensity of [sbond]C[tbond]N absorption peak at 2,237 cm −1 , appeared in the spectrum of UEC15, was decreased compared with that of CTBN, which was probably due to the lower volume fraction of CTBN in the sample [10,19].…”

Cure kinetics modeling and thermomechanical properties of cycloaliphatic epoxy-anhydride thermosets modified with hyperstar polymers

“…There is a limited number of reports in the literature on the toughening of thermosetting formulations based on cycloaliphatic epoxides using a variety of modifiers such as liquid rubbers, nanofillers, thermoplastics or reactive HBPs, among others . In the present work, HSPs with similar structures to those reported by Däbritz et al are used as additives in biscycloaliphatic epoxy‐anhydride formulations cured with a tertiary amine as anionic initiator, with the purpose of enhancing their impact strength.…”

Nanostructured epoxy—rubber network modified with mwcnt and ionic liquid: Electrical, dynamic‐mechanical, and adhesion properties

“…Their high crosslink density also contributes for a decrease in toughness. Thus, the incorporation of liquid rubber constitutes a common practice to overcome the inherent brittleness of these materials [1][2][3][4][5][6][7][8][9]. Unfortunately, in most of these cases, the increase in toughness is accomplished by a decrease in stiffness and glass transition temperature (T g ).…”