Development and kinetic evaluation of a low-cost temperature-sensitive shape memory polymer for 4-dimensional printing

2020 ◽  
Vol 106 (9-10) ◽  
pp. 4263-4279
Author(s):  
Michael Carlson ◽  
Ye Li
Keyword(s):  
Shape Memory ◽  
Low Cost ◽  
Shape Memory Polymer ◽  
Temperature Sensitive ◽  
Kinetic Evaluation ◽  
Dimensional Printing

scholarly journals Structural multi-colour invisible inks with submicron 4D printing of shape memory polymers

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Wang Zhang ◽  
Hao Wang ◽  
Hongtao Wang ◽  
John You En Chan ◽  
Hailong Liu ◽  
...  
Keyword(s):  
Shape Memory ◽  
Information Hiding ◽  
Shape Memory Polymer ◽  
Shape Memory Polymers ◽  
Photonic Devices ◽  
Temperature Sensitive ◽  
4D Printing ◽  
Two Photon ◽  
Shape Memory Effects ◽  
Nanoscale Structure

AbstractFour-dimensional (4D) printing of shape memory polymer (SMP) imparts time responsive properties to 3D structures. Here, we explore 4D printing of a SMP in the submicron length scale, extending its applications to nanophononics. We report a new SMP photoresist based on Vero Clear achieving print features at a resolution of ~300 nm half pitch using two-photon polymerization lithography (TPL). Prints consisting of grids with size-tunable multi-colours enabled the study of shape memory effects to achieve large visual shifts through nanoscale structure deformation. As the nanostructures are flattened, the colours and printed information become invisible. Remarkably, the shape memory effect recovers the original surface morphology of the nanostructures along with its structural colour within seconds of heating above its glass transition temperature. The high-resolution printing and excellent reversibility in both microtopography and optical properties promises a platform for temperature-sensitive labels, information hiding for anti-counterfeiting, and tunable photonic devices.

Modal Analyses of Deployable Truss Structures Based on Shape Memory Polymer Composites

2016 ◽  
Vol 08 (07) ◽  
pp. 1640009 ◽  
Author(s):  
Fengfeng Li ◽  
Liwu Liu ◽  
Xin Lan ◽  
Tong Wang ◽  
Xiangyu Li ◽  
...  
Keyword(s):  
Finite Element ◽  
Shape Memory ◽  
Polymer Composites ◽  
Dynamic Properties ◽  
Low Cost ◽  
Shape Memory Polymer ◽  
Truss Structures ◽  
Modal Test ◽  
The Stability ◽  
Mechanical Devices

With large spatial deployable antennas used more widely, the stability of deployable antennas is attracting more attention. The form of the support structure is an important factor of the antenna’s natural frequency, which is essential to study to prevent the resonance. The deployable truss structures based on shape memory polymer composites (SMPCs) have made themselves feasible for their unique properties such as highly reliable, low-cost, light weight, and self-deployment without complex mechanical devices compared with conventional deployable masts. This study offers deliverables as follows: an establishment of three-longeron beam and three-longeron truss finite element models by using ABAQUS; calculation of natural frequencies and vibration modes; parameter studies for influence on their dynamic properties; manufacture of a three-longeron truss based on SMPC, and modal test of the three-longeron truss. The results show that modal test and finite element simulation fit well.

scholarly journals The Influence of Shape Changing Behaviors from 4D Printing through Material Extrusion Print Patterns and Infill Densities

Materials ◽  
2020 ◽  
Vol 13 (17) ◽  
pp. 3754
Author(s):  
Seokwoo Nam ◽  
Eujin Pei
Keyword(s):  
Shape Memory ◽  
Recovery Time ◽  
Shape Recovery ◽  
Shape Memory Polymer ◽  
Material Extrusion ◽  
Concentric Pattern ◽  
Dimensional Printing ◽  
Recovery Result ◽  
Am Processes ◽  
Recovery Temperature

Four-dimensional printing (4DP) is an approach of using Shape Memory Materials (SMMs) with additive manufacturing (AM) processes to produce printed parts that can deform over a determined amount of time. This research examines how Polylactic Acid (PLA), as a Shape Memory Polymer (SMP), can be programmed by manipulating the build parameters of material extrusion. In this research, a water bath experiment was used to show the results of the shape-recovery of bending and shape-recovery speed of the printed parts, according to the influence of the print pattern, infill density and recovery temperature (Tr). In terms of the influence of the print pattern, the ‘Quarter-cubic’ pattern with a 100% infill density showed the best recovery result; and the ‘Line’ pattern with a 20% infill density showed the worst recovery result. The ‘Cubic-subdivision’ pattern with a 20% infill density demonstrated the shortest recovery time; and the ‘Concentric’ pattern with a 100% infill density demonstrated the longest recovery time. The results also showed that a high temperature and high infill density provided better recovery, and a low temperature and low infill density resulted in poor recovery.

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

scholarly journals Four-dimensional printing of a novel acrylate-based shape memory polymer using digital light processing

2019 ◽  
Vol 171 ◽  
pp. 107704 ◽  
Author(s):  
Hongzhi Wu ◽  
Peng Chen ◽  
Chunze Yan ◽  
Chao Cai ◽  
Yusheng Shi
Keyword(s):  
Shape Memory ◽  
Shape Memory Polymer ◽  
Digital Light Processing ◽  
Dimensional Printing

Shape memory polymer composite coatings with enhanced mechanical and antimicrobial properties

2018 ◽  
Vol 47 (1) ◽  
pp. 63-71 ◽  
Author(s):  
Xin Wang ◽  
Xiaoling Xu ◽  
Zuowan Zhou ◽  
Jihua Gou
Keyword(s):  
Wear Resistance ◽  
Shape Memory ◽  
Spray Deposition ◽  
Low Cost ◽  
Composite Coatings ◽  
Shape Memory Polymer ◽  
Antimicrobial Property ◽  
Thermo Gravimetric Analysis ◽  
Gravimetric Analysis ◽  
Content Type

Purpose This paper aims to exploit shape memory polymer (SMP) composite as multifunctional coatings for protecting substrates from surface wear and bacterial. The efficiency of added nano or micro-sized particles in enhancing the properties of SMP was investigated. This study also attempts to use a low-cost and effective spraying approach to fabricate the coatings. The coatings are expected to have good conformability with the substrate and deliver multi-functional performance, such as wrinkle free, wear resistance, thermal stability and antimicrobial property. Design/methodology/approach High-performance SMP composite coatings or thin films were fabricated by a home-made continuous spray-deposition system. The morphologies of the coatings were studied using the scanning electron microscope and the transmission electron microscope. The abrasion properties were evaluated by Taber Abraser test, and thermo-gravimetric analysis was carried out to investigate the thermal properties of prepared composites. The antimicrobial property was determined by the inhibition zone method using E. coli. The thermally responsive shape memory effect of the resulting composites was also characterized. Findings The morphology analysis indicated that the nanoclay was distributed on the surface of the coating which resulted in a significant improvement of the wear property. The wear resistance of the coatings with nanoclay was improved as much as 40 per cent compared with that of the control sample. The thermo-gravimetric analysis revealed that the weight loss rate of composites with nanoclay was dropped over 40 per cent. The SMP coating with zinc oxide (ZnO) showed excellent antimicrobial effect. The shape recovery effect of SMP/nanoclay and SMP/ZnO composites can be triggered by external heating and the composites can reach a full shape recovery within 60 s. Research limitations/implications This study proposed a continuous spray-deposition fabrication of SMP composite coatings, which provides a new avenue to prepare novel multi-functional coatings with low cost. Originality/value Most studies have emphasized on the sole property of SMP composites. Herein, a novel SMP composite coating which could deliver multi-functionality such as wrinkle free, wear resistance, thermal stability and antimicrobial property was proposed.

Four-dimensional printed self-deploying circular structures with large folding ratio inspired by origami

2020 ◽  
Vol 31 (18) ◽  
pp. 2128-2136
Author(s):  
Shuai Liu ◽  
Qing-Sheng Yang ◽  
Ran Tao
Keyword(s):  
Shape Memory ◽  
Large Scale ◽  
Shape Memory Polymer ◽  
Smart Structures ◽  
Stable States ◽  
Dynamic Mechanical Analyzer ◽  
Solar Sails ◽  
Element Simulation ◽  
Circular Structures ◽  
Dimensional Printing

Inspired by the origami, a series of smart circular structures with large folding ratio was designed and fabricated by four-dimensional printing in this article. The structure consists of the crease and plate parts by embedding the Miura-ori into a folding fan, and has the characteristics of bi-stable states and self-deployment by introducing soft and hard shape memory polymers. The shape memory polymer material parameters were obtained by the dynamic-mechanical analyzer, and then the constitutive equation can be determined. To demonstrate the folding and deployment performance of the smart structures, the experiment and finite element simulation was carried out. It is shown that the structures can repeatedly be folded and deployed by temperature-controlled shape memory effect of shape memory polymer. This design can be applied to the large-scale and multiple level smart structures such as antennas and deployable solar sails.

scholarly journals 4D Printing of Shape Memory Polymer via Liquid Crystal Display Stereolithography

2020 ◽  
Author(s):  
Wubing Shan ◽  
Yifan Chen ◽  
Hu Mo ◽  
Shigang Qin ◽  
Peng Liu
Keyword(s):  
Liquid Crystal ◽  
3D Printing ◽  
Shape Memory ◽  
Shape Recovery ◽  
Liquid Crystal Display ◽  
Low Cost ◽  
Shape Memory Polymer ◽  
Tensile Tests ◽  
Uniaxial Tensile ◽  
High Efficient

In this study, we report a new epoxy acrylate based shape memory polymer(SMP) fabricated by Liquid crystal display (LCD) Stereolithographic 3D printing. The printed 3D object has a high resolution and high transparency in visible light region. The uniaxial tensile tests showed enhanced tensile toughness and tunable mechanical properties. The fix-recovery and cycle tests indicated high shape recovery properties including high shape recovery rate and excellent cycling stability. In addition, a smart electrical valve actuator was fabricated that can be used in fast heat or electricity responsive electrical circuits. LCD 3D printing provides a low-cost and high efficient way to fabricate fast responsive SMP, which can be used in wide applications in various fields on aerospace engineering, biomedical devices, soft robots and electronic devices.

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