An investigation on laser-triggered shape memory behaviors of hydro-epoxy/carbon black composites

Abstract

A series of novel laser-triggered shape memory composites were prepared by using hydro-epoxy resin (HEP) as matrix with non-filled, 0.5, 1.0, 1.5 and 2.0 wt% carbon black. The influences of CB content, material thickness and laser power density on laser-triggered shape memory behaviors of composites were investigated systematically. The results indicated that CB particles had a better photothermal conversion effect on 1.064 μm near-infrared laser, and shape recovery ratio of CB/HEP composites were above 97%. Besides, with the increase of CB content, the growth trends of shape recovery ratio remained unchanged, but increased with the decrease of material thickness and the increase of power density. It was also shown that the HEP polymer with non-filled CB occurred shape recovery behavior under irradiating of 10.64 μm mid-infrared laser. According to above basic researches, multiple intermediate shapes can be get because of spatial controllable of laser-triggered, which is an appealing feature that cannot be obtained from thermal-activated SMPs based on a bulk thermal effect.

Nanocomposites of Poly(hydroxyurethane)s with Multiwalled Carbon Nanotubes: Synthesis, Shape Memory, and Reprocessing Properties

“…700–1100 nm) and the absorbed energy was subsequently dissipated in the form of heat. With the photothermal effect, − it is anticipated that the thermally induced shape memory behavior of the PHU nanocomposites could be triggered in a noncontact manner by the use of infrared laser. In the tests, the specimens with temporary shapes were irradiated under the infrared laser (λ = 808 nm) at room temperature and the recovery of shape was examined.…”

Effects of selectively triggered photothermal particles on shape memory polymer composites: An investigation on structural performance, thermomechanical characteristics and photothermal behaviour

“…Part of the vibrational energy is converted into the electromagnetic waves and radiate outwards. The rest is transformed into kinetic energy of electrons and then converted into heat energy through the relaxation process between electrons and lattices (Herath et al, 2018;Liu et al, 2018). As shown in Figure 2, Yb(TTA) 3 Phen has demonstrated a unique absorbance peak from 940 to 980 nm.…”

Additive Manufacturing of Shape Memory Polymer Composites for Futuristic Technology

“…The laser trigger is used to check the composite’s shape memory properties, and it comes out to be more than 95%. Also, higher photothermal energy conversions were obtained . Using simple solution blending methods, poly­(ε-caprolactone) (PCL) blends and thermoplastic polyurethane (TPU) with different weight ratios were prepared in N,N-dimethylformamide (DMF).…”

“…Also, higher photothermal energy conversions were obtained. 84 Using simple solution blending methods, poly(ε-caprolactone) (PCL) blends and thermoplastic polyurethane (TPU) with different weight ratios were prepared in N,N-dimethylformamide (DMF). Polydopamine (PDA) fillers are added to increase the light responsiveness of the SMP nanocomposite.…”