Brillouin light scattering measurements have been used to study the stress induced modification in the elastic properties of two glass forming polymers: polybutadiene and epoxy-amine resin, prototypes of linear and network polymers, respectively. Following the usual thermodynamic path to the glass transition, polybutadiene has been studied as a function of temperature from the liquid well into ...

Improved dimensional stability of composites is desired in applications where they are exposed to varying temperature conditions. The current study aims at analyzing the effect of vapor-grown carbon nanofibers (CNFs) on the thermal expansion behavior of epoxy matrix composites and hollow particlefilled composites (syntactic foams). CNFs have a lower coefficient of thermal expansion (CTE) than e...

Two different commercial hyperbranched poly(ethyleneimine)s (HBPEI), with molecular weights (MW) of 800 and 25,000 g/mol, and denoted as PEI800 and PEI25000, respectively, as well as the mixtures with a Diglycidyl Ether of Bisphenol-A (DGEBA) epoxy resin, have been studied using thermal analysis techniques (DSC, TGA), dielectric relaxation spectroscopy (DRS), and dynamic mechanical analysis (DM...

Wind energy is one of the fastest-growing sources of electricity worldwide. The emergence of upscaling on the WT size results in research and development on new materials, especially for the WT blades, that will also fulfil the LP requirements. In the present work, graphene oxide (GO) will be utilised as a nanofiller for epoxy resin systems used as binding polymers or adhesives for CFRP compone...

In this study, Sendust (Fe85Si9.6Al5.4) nanostructure alloy was prepared bymechanical alloying and was characterized by X-ray diffraction. In addition, the alloy’smorphology and its distribution particle size were investigated by scanning electronmicroscopy method. The alloyed powders were insulated with 4wt% of three differentinsulating materials including polyvinyl alc...

Polylactic acid (PLA) was melt-blended with epoxy resin to study the effects of reaction on mechanical and thermal properties PLA. The addition 0.5% (wt/wt) PLA increased maximum tensile strength (57.5 MPa) 67 MPa, whereas 20% improved elongation at break 12%, due crosslinking caused by reaction. morphology PLA/epoxy blends showed nanoparticle dispersion in matrix that presented a smooth fractu...

In this work the fracture toughness of epoxy resin has been improved through the addition of low loading of single part and hybrid nanofiller materials. Functionalised multi-walled carbon nanotubes (f-MWCNTs) was used as single filler, increased the critical strain energy release rate, GIC, by 57% compared to the neat epoxy, at only 0.1 wt% filler content. Importantly, no degradation in the ten...

Molecular dynamic (MD) simulations were carried out to predict the thermo-mechanical properties of the cured epoxy network composed of diglycidyl ether bisphenol A (DGEBA) epoxy resin and tetrahydrophthalic anhydride (THPA) curing agent and their single-walled carbon nanotubes (SWCNT) reinforced the epoxy matrix composites. Different characters such as the density of the materials and mean squa...

The influence of surface modifications on the mechanical properties of epoxy-hexagonal boron nitride nanoflake (BNNF) nanocomposites is investigated. Homogeneous distributions of boron nitride nanoflakes in a polymer matrix, preserving intrinsic material properties of boron nitride nanoflakes, is the key to successful composite applications. Here, a method is suggested to obtain noncovalently f...

In this paper, the high purity bisphenol-A diglycidyl ether (DGEBA) epoxy resin (D.E.R 332), which is mainly used as filament winding, electrical laminates and encapsulation applications, was used as a host. The epoxy resins were loaded with nano-SiO2 and nano-BN in different loading concentrations, and then test of the AC/DC breakdown strength has been performed. It has been observed that the ...