Effect of low concentration hollow glass microspheres on mechanical and thermomechanical properties of epoxy composites

Abstract

The processing of hollow glass microsphere (HGM) based composites is one of the growing areas in materials research due to the potential of significantly changing material properties even at low HGM concentrations. HGM-epoxy composites are prepared by sonication method. Four weight ratio configurations are considered (1, 3, 5 wt% HGM and 5 wt% NH 2 functionalized HGM) and compared with neat epoxy to study the microenrichment effect. The influence of low volume HGM and functionalized HGM reinforcement on epoxy in the compressive and thermo-mechanical behavior of the composites were characterized by thermo-gravimetric analysis, dynamic mechanical analysis, and compression testing. The compressive strength of HP 5% sample decreased in 101%, as compared with that of EP sample, whereas, storage modulus of HP 5% and f-HP 5% sample is increased by 27.7 and 32.5%, as compared with the EP sample, but did not significantly affected the thermal stability of the obtained composites. Scanning electron microscope images of the fractured samples had shown a good dispersion and interaction of the HGM in the matrix. By introducing HGM content, there was a remarkable difference in the surface morphology of the fractured surface of epoxy. POLYM. COMPOS., 40:3493-3499, 2019.

Morphology and mechanical characterization of carbon nanotubes/epoxy based material filled with hollow glass microsphere

“…The syntactic foam exhibits some improved reliability to mechanical and electrical loading when compared with the mere resin formed products. Also properties can be tailored as per the demand by varying the proportion of HGM and selecting appropriate wall thickness to a considerable extent [1][2][3][4][5][6][7]. Among other hollow micro spheres HGM possess significant lower density, higher thermal insulation and high dielectric constant [8][9][10][11].…”

Radially grown carbon nanomaterials on hollow glass microspheres and their application in composite foams with excellent electromagnetic interference shielding

“…It has also been reported that the glass transition temperature (T g ) of syntactic foam increases [1] and coefficient of thermal expansion (CTE) reduces when compared to epoxy as HGM restricts polymer chain mobility caused due to increase in temperature, which proves to be a significant contribution in thermal stability. [6] Introduction of hollow microspheres reduces the epoxy volume fraction and increases the inhomogeneity content, consequently reducing the tensile strength of the composite. Epoxy volume fraction and effective tensile strength of the composite decrease due to increase in HGM volume because of poor interfacial strength between the matrix material and HGM; however, its specific strength (strength per unit density) increases due to the lower density of HGM.…”

Influence of Graphene Nano Fillers and Carbon Nano Tubes on the Mechanical and Thermal Properties of Hollow Glass Microsphere Epoxy Composites

“…Koopman et al explored the compression of glass micro balloons and observed a clear correlation between the diameter to failure load and diameter to fracture energy [10]. Mohammed Imran et al studied the variable weight percentage of HGM in epoxy composites made by the sonication method and reported that the compressive strength declined when the HGM weight percentage increased and the storage modulus increased [11]. Rahaman et al investigated the glass fiber-reinforced laminated epoxy carbon nano tube composites and discovered that the addition of multi-walled carbon nano tubes significantly enhanced the composite's flexural modulus, flexural strength, and modulus of storage [12].…”