Synthesis and Characterization of N,N'-bismaleimido-4,4'-diphenyl methane — Vinyl Ester Oligomer Modified Unsaturated Polyester Interpenetrating Matrices for Advanced Composites

Abstract

An intercrosslinked network of hybrid bismaleimide-modified vinyl ester oligomer-unsaturated polyester matrix systems were developed. Vinyl ester oligomer was used as a toughening agent for unsaturated polyester resin and was added in 10, 20 and 30% (by weight). Benzoyl peroxide was used as curing agent. The vinyl ester oligomer-toughened unsaturated polyester matrix systems were further modified with 5, 10 and 15% (by weight) of bismaleimide. Bismaleimide-modified vinyl esterunsaturated polyester matrices were characterized by mechanical (tensile strength, flexural strength, tensile modulus, flexural modulus and impact strength), thermal [differential scanning calorimetry (DSC) thermogravimetic analysis (TGA) and heat deflection temperature analysis (HDT)] and morphological studies [scanning electron microscope (SEM)] and water absorption. Data obtained from mechanical and thermal studies indicated that the introduction of vinyl ester oligomer into unsaturated polyester resin improved the fracture toughness with marginal reduction in the values of heat deflection temperature and glass transition temperature. The introduction of bismaleimide into vinyl ester oligomer-incorporated unsaturated polyester resin enhanced both thermal and mechanical behavior. The SEM micrographs of fractured surfaces of vinyl ester oligomer modified unsaturated polyester systems and BMI modified vinyl ester-unsaturated polyester matrices illustrate the presence of heterogeneous morphology.

Thermal and mechanical properties of functionalized mullite reinforced unsaturated polyester composites

“…Composite materials find wide range of industrial, engineering, and aerospace applications, because of their versatile thermo mechanical, dielectric, and corrosion resistant properties . Unsaturated polyester (UP) resins are widely used as matrices for polymer composites and laminates, because of their amenable processing behavior, easy handling, high thermal stability, good heat resistance, low water absorption, excellent chemical resistance, and competitive cost .…”

Preparation and Characterization of Organoclay-Filled, Vinyl Ester-Modified Unsaturated Polyester Nanocomposites

“…Some of the samples of nanocomposites developed in the present investigation using commercially valuable matrix resins were organophilic clay-filled unsaturated polyester and vinyl ester-modified unsaturated polyester nanocomposites. The present study was the continuation of our previous work in the modification of industrially important matrix resins [21,22].…”

Synthesis and Characterization of Bismaleimide Modified Vinyl Ester Monomer-Unsaturated Polyester Intercrosslinked Hybrid Matrices

“…Vinyl ester oligomer-bismaleimide based work has already been published by our coworkers from our laboratory [16][17][18] . In order to improve mechanical, thermomechanical and thermal properties Cyclohexyl-1,1'-bis[4-(γ-2-methylphenoxy)α-hydroxypropylacrylate] has been synthesized and is used with VEM to modify UPR.…”