Enhanced mechanical performance of aDGEBAepoxyresin‐basedshape memory polymer by introducing graphene oxide via covalent linking

Abstract

Shape memory polymers (SMP) are prepared, via dual thiol‐epoxy/thiol‐ene reactions, from diglycidyl ether of bisphenol A (DGEBA), a trithiol (TMP), a tetraallyl amine (TAA), and small amounts (0.1–0.5 wt.%) of graphene oxide either pristine (GO) or functionalized with methacrylate groups (GOM). The incorporation of GOM to the epoxy resin network permits a good load transfer, which is reflected in improved properties such as Young modulus (from 220 to 519 MPa), tensile strength (from 46.3 to 69.2 MPa), Izod impact strength (from 0.051 to 0.42 J/mm), torque (from 0.008 to 0.031 Nm), and glass transition temperature (from 75 to 105°C). Such improvement in properties is attributed to the incorporation of GOM via covalent linking, which is a good strategy for improving polymer‐particle interaction and particle dispersion. The epoxy‐based SMP also show high storage modulus (up to 2.36 GPa) and high deformation capacity, which are reflected in good shape fixity (between 97% and 100%) and thermo‐induced shape recovery (between 97% to 99.7%) behaviors in flexion mode tests.

Developing functional epoxy/graphene composites using facile in‐situ mechanochemical approach

“…Therefore, it is essential to explore practical and eco‐friendly approaches to develop functional and high strength epoxy composites 2,3 . Plethora of studies were conducted on toughened and functional epoxy nanocomposite using various nanomaterials such as graphene, carbon nanotubes and hexagonal‐boron nitride 4–6 . Han et al 7,8 studied the effect of adding various 2D materials in improving mechanical and thermal properties of epoxy; they reported that hexagonal boron nitride and graphene could improve toughness of epoxy by 260% and 338% at 2 wt%.…”

“…2,3 Plethora of studies were conducted on toughened and functional epoxy nanocomposite using various nanomaterials such as graphene, carbon nanotubes and hexagonal-boron nitride. [4][5][6] Han et al 7,8 studied the effect of adding various 2D materials in improving mechanical and thermal properties of epoxy; they reported that hexagonal boron nitride and graphene could improve toughness of epoxy by 260% and 338% at 2 wt%. In addition, thermal conductivity reached an increment of 64% and 135% when 4 wt% of hexagonal boron nitride and graphene are added, respectively.…”

Development of cyanate ester‐based shape memory composite reinforced by multi‐walled carbon nanotube modified with silicon dioxide

“…were added into pristine SMPs matrix to enhance mechanical strength and recovery force. [23][24][25][26][27] Among these fillers, carbon nanotubes (CNTs) are a potential candidate for the reinforcement of SMP matrix because of its remarkable specific strength and superb thermal conductivity. Generally, the homogeneous dispersion of CNTs in CNT/resin composites plays a crucial role in efficiently improving mechanical properties.…”

“…Various nanomaterials (graphene, carbon nanotube, nano silica, nano clay, nitrocellulose, etc.) were added into pristine SMPs matrix to enhance mechanical strength and recovery force 23–27 . Among these fillers, carbon nanotubes (CNTs) are a potential candidate for the reinforcement of SMP matrix because of its remarkable specific strength and superb thermal conductivity.…”

Ultra‐High Loading of Coal‐Derived Flash Graphene Additives in Epoxy Composites

“…As such, for most graphene-type materials, the optimal range of loading is as low as 0.1 to 0.5 wt%, with some reports reaching as high as 8 wt%. [2,[24][25][26][27][28][29][30][31][32] The high aspect ratio of graphene (between 500 and 2000) [33] means that mechanical property enhancements can be obtained at relatively small loadings, which is advantageous due to the high cost of conventionally produced graphene. [34] Addition of graphene materials has been shown to enhance mechanical properties, [35,36] EMI shielding, [37] and electrical properties [38,39] of epoxy composites.…”