scholarly journals Shape Memory Composite Sandwich Structures with Self-Healing Properties

Polymers ◽  
2021 ◽  
Vol 13 (18) ◽  
pp. 3056
Author(s):  
Fabrizio Quadrini ◽  
Denise Bellisario ◽  
Leandro Iorio ◽  
Loredana Santo ◽  
Panagiotis Pappas ◽  
...  
Keyword(s):  
Shape Memory ◽  
Sandwich Structure ◽  
Shape Memory Polymer ◽  
Industrial Applications ◽  
Foam Core ◽  
Self Healing ◽  
Structure Damage ◽  
Pu Foam ◽  
Low Concentrations ◽  
Shape Memory Composite

In this study, Polyurea/Formaldehyde (PUF) microcapsules containing Dicyclopentadiene (DCPD) as a healing substance were fabricated in situ and mixed at relatively low concentrations (<2 wt%) with a thermosetting polyurethane (PU) foam used in turn as the core of a sandwich structure. The shape memory (SM) effect depended on the combination of the behavior of the PU foam core and the shape memory polymer composite (SMPC) laminate skins. SMPC laminates were manufactured by moulding commercial carbon fiber-reinforced (CFR) prepregs with a SM polymer interlayer. At first, PU foam samples, with and without microcapsules, were mechanically tested. After, PU foam was inserted into the SMPC sandwich structure. Damage tests were carried out by compression and bending to deform and break the PU foam cells, and then assess the structure self-healing (SH) and recovery capabilities. Both SM and SH responses were rapid and thermally activated (120 °C). The CFR-SMPC skins and the PU foam core enable the sandwich to exhibit excellent SM properties with a shape recovery ratio up to 99% (initial configuration recovery). Moreover, the integration of microcapsules (0.5 wt%) enables SH functionality with a structural restoration up to 98%. This simple process makes this sandwich structure ideal for different industrial applications.

Shape Memory Composite Hands for Space Applications

2015 ◽  
Author(s):  
Fabrizio Quadrini ◽  
Giovanni Matteo Tedde ◽  
Loredana Santo
Keyword(s):  
Shape Memory ◽  
Composite Structures ◽  
Polymer Matrix Composites ◽  
Fiber Composite ◽  
Shape Memory Polymer ◽  
Small Scale ◽  
Carbon Fiber Composite ◽  
Space Applications ◽  
First Case ◽  
Shape Memory Composite

Shape memory composites combine structural properties of continuous-fiber polymer-matrix composites with functional behavior of shape memory polymers. In this study, the production of shape memory composite structures for aerospace applications is described. Small-scale grabbing systems were prototyped as they could be used for space cleaning operations. Composite hands were manufactured by using two carbon fiber composite layers with a shape memory polymer interlayer. They were produced in the closed-hand configuration and subsequently opened in the memorizing step. Due to heating, composites tended to recover the initial closed configuration, allowing to grab small objects. Two different shapes (cylindrical and cubic) were considered for composite hands. In the first case, the shape memory behavior was given to the entire structure whereas, in the second case, shape memory properties were provided only to folding zones. As a result, a good shape recovery was observed in both cases but part weight was already not negligible also in these small-scale systems.

Shape memory composite (SMC) self-healing coatings for corrosion protection

2016 ◽  
Vol 97 ◽  
pp. 261-268 ◽  
Author(s):  
Luntao Wang ◽  
Leping Deng ◽  
Dawei Zhang ◽  
Hongchang Qian ◽  
Cuiwei Du ◽  
...  
Keyword(s):  
Shape Memory ◽  
Corrosion Protection ◽  
Self Healing ◽  
Shape Memory Composite

scholarly journals Temperature sensing and actuating capabilities of polymeric shape memory composite containing thermochromic particles

2015 ◽  
Vol 44 (4) ◽  
pp. 224-231 ◽  
Author(s):  
Haibao Lu ◽  
Yongtao Yao ◽  
Long Lin
Keyword(s):  
Shape Memory ◽  
Information Dissemination ◽  
Shape Memory Polymer ◽  
Thermomechanical Properties ◽  
Temperature Sensing ◽  
Content Type ◽  
Thermally Responsive ◽  
Shape Memory Composites ◽  
Potential Applications ◽  
Shape Memory Composite

Purpose – This paper aims to create and to study multifunctional shape memory polymer (SMP) composites having temperature-sensing and actuating capabilities by embedding thermochromic particles within the polymer matrix. Design/methodology/approach – The multifunctional materials were fabricated following a process consisting of blending (of the thermochromic particles and the SMP at various ratios), mixing, degasing, moulding and thermal curing, prepared by incorporating thermochromic particles within the polymer. The effect of the thermochromic particles on the thermomechanical properties and thermally responsive shape memory effect of the resulting multifunction SMP composites were characterised and interpreted. Findings – It was found that exposure of the composites to temperatures above 70°C led to a pronounced change of their colour that was recorded by the thermal and electrical actuation approaches and was reproducibly reversible. It was also found that the colour of the composites was independent of the mechanical state of the SMP. Such effects enabled monitoring of the onset of the set/release temperature of the SMP matrix. Furthermore, the combination of thermochromic additive and the SMP resulted in significantly improved thermomechanical strength, absorption of infrared radiation and the temperature distribution of the SMP composites. Research limitations/implications – The temperature-sensing and actuating capabilities of the polymeric shape memory composites developed through this study will help to extend the field of potential applications of such composites to fields including sensors, actuators, security labels and information dissemination, where colour indication is an advantageous feature. Originality/value – The SMP composites capable of temperature sensing and actuating are novel.

scholarly journals Fabrication and Two-Way Deformation of Shape Memory Composite with SMA and SMP

2010 ◽  
Vol 638-642 ◽  
pp. 2189-2194 ◽  
Author(s):  
Hisaaki Tobushi ◽  
Shunichi Hayashi ◽  
Y. Sugimoto ◽  
K. Date
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
Shape Memory Effect ◽  
Memory Effect ◽  
Shape Memory Polymer ◽  
Bending Deformation ◽  
Heating And Cooling ◽  
Round Shape ◽  
Heat Treated ◽  
Shape Memory Composite

The shape memory composite (SMC) with shape memory alloy (SMA) and shape memory polymer (SMP) was fabricated, and the two-way bending deformation and recovery force were investigated. The results obtained can be summarized as follows. (1) Two kinds of SMA tapes which show the shape memory effect and superelasticity were heat-treated to memorize the round shape, respectively. The shape-memorized round SMA tapes were sandwiched between the SMP sheets, and the SMC belt was fabricated. (2) The two-way bending deformation with an angle of 56 degrees is observed during heating and cooling. (3) If the SMC belt is heated and cooled by keeping the form, recovery force increases during heating and decreases during cooling.

Self-Healing Four-Dimensional Printing with an Ultraviolet Curable Double-Network Shape Memory Polymer System

2019 ◽  
Vol 11 (10) ◽  
pp. 10328-10336 ◽  
Author(s):  
Biao Zhang ◽  
Wang Zhang ◽  
Zhiqian Zhang ◽  
Yuan-Fang Zhang ◽  
Hardik Hingorani ◽  
...  
Keyword(s):  
Shape Memory ◽  
Shape Memory Polymer ◽  
Polymer System ◽  
Self Healing ◽  
Double Network ◽  
Ultraviolet Curable ◽  
Dimensional Printing
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