Transparent Luminescent Hyperbranched Epoxy/Carbon Oxide Dot Nanocomposites with Outstanding Toughness and Ductility

Abstract

A luminescent transparent hyperbranched epoxy nanocomposite with previously unachieved outstanding toughness and elasticity has been created by incorporation of a very small amount of carbon oxide nanodots. The nanocomposites of the hyperbranched epoxy with carbon oxide dots at different dose levels (0.1, 0.5, and 1.0 wt %) have been prepared by an ex situ solution technique followed by curing with poly(amido-amine) at 100 °C. Different characterizations and evaluations of mechanical and optical properties of the nanocomposites have been performed. The toughness (area under the stress-strain curve) of the pristine system has been improved dramatically by 750% with only 0.5 wt % carbon oxide dots. The tensile strength has been enhanced from 38 to 46 MPa, whereas the elongation at break improved noticeably from 15 to 45%. Excellent adhesive strength combined with transparency and photoluminescent behavior renders these materials highly interesting as functional films in optical devices like light-emitting diodes and UV light detection systems as well as in anticounterfeiting applications.

Mechanical, Swelling, and Structural Properties of Mechanically Tough Clay-Sodium Polyacrylate Blend Hydrogels

“…Thus the mechanical properties of the blend hydrogels composed of PAAS with molecular weights smaller than a few million grams per mole become extremely poor, as reported in a previous study [8]. The toughness of a material may be characterized by the area under the tensile stress-strain curves [15][16][17][18];…”

“…Since the blend hydrogel used in this study is a four-component system composed of clay, PAAS, TSPP, and water, the whole X-ray scattering intensity can be described by a sum of several partial scattering functions [19]. However, as the X-ray scattering length of clay is much larger than those of water and PAAS [6], the SAXS The toughness of a material may be characterized by the area under the tensile stress-strain curves [15][16][17][18];…”

Brittleness and toughness of polymers and other materials

“…The term "materials toughness" is often used, but there are several definitions of that quantity. One of those definitions says that toughness τ is the area under the engineering stress s vs. engineering strain ε curve determined in tensile testing [1][2][3]. Thus…”

Biocide immobilized OMMT-carbon dot reduced Cu2O nanohybrid/hyperbranched epoxy nanocomposites: Mechanical, thermal, antimicrobial and optical properties

“…The hyperbranched epoxy nanocomposites with different amounts of MITH-NH (1, 2 and 3 wt.% MITH-NH containing biocide: 0.2, 0.4 and 0.6 wt.% with respect to hyperbranched epoxy) were prepared by solution technique using our earlier method [20,35]. The requisite amount of the THF dispersed nanohybrid particles were added to the hyperbranched epoxy resin and stirred magnetically for 2 h at room temperature followed by ultrasonication for 10 min.…”

“…In this vein, carbon dots may reduce metal salts in a controlled manner and one pot such reduction are gaining importance in recent times [15,16]. Carbon dot is now a topic of current interest in nanomaterial research because of its simple synthetic protocol and multifaceted applications [17][18][19][20]. The aqueous solubility, functionalizability, resistance to photobleaching, toxicity and biocompatibility are attested it as a superior material over other nanomaterials [21,22].…”