Deployment Analysis of Aramid Fiber Reinforced Shape-Memory Epoxy Resin Composites

Abstract

This work aims to study the shape recovery of aramid fiber-reinforced shape-memory epoxy resin composite (SMERs). A circular tube can be assumed to be composed of a pair of curved tape with the same radius before being folded, and the middle position of this tubular structures is folded with a small curvature. The cylindrical shell is deformed into a flat shape at the folding line. So the shape memory fold-deploy experiments of the three deployable structures, flat tape, curved tape, and circular tube prepared with SMERs, were performed respectively, and the shape memory deployable processes were also simulated with finite element model. The temperature dependences of deployment angle, axial stress and axial strain in the shape memory folding step, cooling step, constraint removal step and reheating step were analyzed. The results showed that the full deployable process of each deployable structure was simulated well compared with experimental results. The strength failure in structure component occurred during the fold-deploy shape memory process. The long-term shear modulus of viscoelastic materials had a great influence on shape memory performance.

Analysis of curing of diglycidyl ether of bisphenol A (BADGE n = 0) with 2‐adamantylethanamine

“…Calorimetric scans were performed with DSC operating in dynamic mode 34 to determine the total heat of the reaction (ΔH t ) and the glass transition temperature (T g ) of the resin. The results obtained were F I G U R E 3 Spectra of 1 H-and 13 C-NMR of the azide obtained F I G U R E 4 Spectra of 1 H-and 13 C-NMR of final product −413.3 ± 5.9 J/g and 95 ± 6 C, respectively.…”

Thermomechanical properties of silica–epoxy nanocomposite modified by hyperbranched polyester: A molecular dynamics simulation

“…[6][7][8] With the development of nanotechnology, epoxy resin nanocomposites have become a new way to enhance the comprehensive properties of epoxy resin. [9][10][11][12][13][14] Incorporating nanoparticles with high mechanical strength and high thermal conductivity into the epoxy resin host can enhance the thermomechanical properties, aging resistance, and electrical properties of composites. [15][16][17][18] Research studies show that the interface between nanoparticles and polymer matrix is the key factor in the improvement of properties and strong interface interactions can achieve high thermal properties and mechanical properties of polymer.…”

Upcycling by grafting onto semi‐crystalline polymers using supercritical CO2

“…Rapid monomer transport is also facilitated as supercritical CO 2 exhibits the density of a liquid and the diffusivity of a gas 18 . Therefore, one can imagine exploiting these transport properties to create many unique materials, including multi‐phase materials 19 – 22 as well as composites containing additives 23‐27 . Additionally, in contrast to many organic solvents, supercritical CO 2 is inexpensive, non‐toxic, non‐flammable, and environmentally benign when fully recovered in processing.…”

“…Nayak, 28 Mukherjee, 29 and El‐Rafie 30 have performed various investigations on graft polymerization of vinyl monomers onto nylon fibers. Of the methods used, radical initiation is the most relevant to the scope of this work.…”

“…18 Therefore, one can imagine exploiting these transport properties to create many unique materials, including multi-phase materials [19][20][21][22] as well as composites containing additives. [23][24][25][26][27] Additionally, in contrast to many organic solvents, supercritical CO 2 is inexpensive, nontoxic, non-flammable, and environmentally benign when fully recovered in processing. Therefore, using this as a processing medium to perform selective graft chemistry on semi-crystalline plastics provides a cost-effective, sustainable method for polymer upcycling.…”