Shape Memory Effect in Micro-Sized Shape Memory Polymer Composite Chains

Abstract

Since the shape memory effect (SME) has been confirmed in micron and submicron sized polyurethane (PU) shape memory polymer (SMP), it might be used in novel micro/nano devices even for surgery/operation inside a single cell. In this study, micron sized protrusive PU SMP composite chains are fabricated via mixing ferromagnetic nickel micro powders with PU SMP/dimethylformamide solution and then cured under a low magnetic field. Depending on the amount of nickel content, vertical protrusive chains with a diameter from 10 to 250 µm and height from 200 to 1500 µm are obtained. The SME in these chains is investigated to confirm the SME in SMP composites at microscale. An array of such protrusive chains may be utilized to obtain re-configurable surface patterns in a simple manner for applications, such as remarkable change in wetting and friction ability. Finally, its potential applications for micro electro mechanical systems (MEMS) and biomedical device are proposed.

Restoration Temperature Control through Glass Transition Temperature Modulation of Shape Memory Polymer for Thermally Switchable Adhesive

“…[ 32 ] Furthermore, surface microstructures, such as micro‐tips, micro‐wedge arrays, and gecko‐mimicking systems, have been introduced to enhance the transfer performance of SMP‐based dry adhesives efficiently. [ 6 , 14 , 15 , 33 , 34 , 35 , 36 , 37 , 38 , 39 , 40 ] The Systems introduced in previous studies have implemented thermal deformation effects to achieve high adhesion forces during picking‐up and safely place substrates with low adhesion forces due to the recovery effect of microstructures. Despite their potential advantages, the current manufacturing process of SMP‐based adhesives remains time‐consuming.…”

Thermo-Responsive Shape Memory Vanillin-Based Photopolymers for Microtransfer Molding

“…It offers the ability to fabricate nanostructures that exhibit vertically aligned nanoarrays and nanopatterns, and the ability to have precise control over the size and geometry of the nanostructures, and to form nanostructures attached to a bulk support. The main advantage of this technique is its fast, easy, and inexpensive, but accurate, reproduction of various 2D or 3D objects from the nanoscale to the macroscale [25,26].…”

Study on Parameter Optimization and Mechanism of Rigid‐Flexible Coupling Underground Engineering Structure of Steel Panel and Polymer

“…For example, carbon black [17,18] can be gradually added to aqueous polyurethane materials. Since the molecular chain can also cause different physical properties of different polyurethane materials, more functional materials now can be used to produce polyurethane foam [19][20][21] and adhesive coatings, etc. en, the products are incorporated polyurethane products and plastic products for many different purposes and can also be widely used in construction [22,23], transportation, and other industries.…”