Development of liquid crystalline polyurethane composites with stage-responsive shape memory effects

2018 ◽  
Vol 9 (5) ◽  
pp. 576-583 ◽  
Author(s):  
Shaojun Chen ◽  
Jianfeng Ban ◽  
Luona Mu ◽  
Haitao Zhuo
Keyword(s):  
Shape Memory ◽  
Polymer Composites ◽  
Liquid Crystalline ◽  
Shape Memory Polymer ◽  
Memory Effects ◽  
Shape Memory Properties ◽  
Shape Memory Effects ◽  
Polyurethane Composites

Novel liquid crystalline shape memory polymer composites with interesting staging-responsive shape memory properties were successfully prepared. The liquid crystalline shape memory polymer composites maintain the intrinsic reversible liquid crystalline properties of Azo11.

Study on Shape Memory Effects of LC Epoxy Resins with Lateral Substituents

2010 ◽  
Vol 428-429 ◽  
pp. 391-393 ◽  
Author(s):  
Li Yan Liang ◽  
De Wen Zhou ◽  
Man Geng Lu
Keyword(s):  
Shape Memory ◽  
Dynamic Mechanical Analysis ◽  
Epoxy Resins ◽  
Liquid Crystalline ◽  
Mechanical Analysis ◽  
Memory Effects ◽  
Ordered Structures ◽  
Alkyl Groups ◽  
Shape Memory Properties ◽  
Shape Memory Effects

A series of shape memorized liquid crystalline epoxides with different length of lateral substituents were prepared with several kinds of hardener. The dynamic mechanical analysis and the sharp memory properties of the resulted LC epoxy resins were studied by POM, WAXD, DSC and DMA. The results showed that the modulus in the rubbery region (ER) of the LC epoxides decreases as the length of lateral alkyl groups increases. And the shape memory properties were strongly impacted not only by the length of lateral substituents, but also by the kinds of hardener. The recovering speeds of the shape-memory liquid crystalline epoxides decrease as the increasing length of lateral alkyl groups. And recovering speeds of LC epoxides cured with aromatic amine (DDM) are faster than that of LC epoxides cured with anhydride (THHPA). The local ordered structures and the lateral substituents played an important role in shape memory effects.

Liquid crystalline polyurethane composites based on supramolecular structure with reversible bidirectional shape memory and multi-shape memory effects

2019 ◽  
Vol 43 (1) ◽  
pp. 103-110 ◽  
Author(s):  
Funian Mo ◽  
Jianfeng Ban ◽  
Lulu Pan ◽  
Bo Shi ◽  
Shaorong Lu
Keyword(s):  
Shape Memory ◽  
Supramolecular Structure ◽  
Liquid Crystalline ◽  
Memory Effects ◽  
Molar Ratio ◽  
Shape Memory Effects ◽  
Polyurethane Composites

In this study, a novel series of supramolecular liquid crystalline (LC) polyurethane composites, named SMPU–#HOBA (# represents the molar ratio of HOBA/BINA), were successfully prepared by incorporating hexadecyloxybenzoic acid (HOBA) into pyridine-containing polyurethane (PU).

scholarly journals Harnessing reversible dry adhesion using shape memory polymer microparticles

RSC Advances ◽  
2021 ◽  
Vol 11 (32) ◽  
pp. 19616-19622
Author(s):  
Wenbing Li ◽  
Junhao Liu ◽  
Wanting Wei ◽  
Kun Qian
Keyword(s):  
Shape Memory ◽  
Shape Memory Polymer ◽  
Shape Memory Polymers ◽  
Memory Effects ◽  
Reversible Adhesion ◽  
Dry Adhesion ◽  
Bonding Property ◽  
Shape Memory Effects ◽  
Polymer Microparticles

Shape memory polymers can provide excellent bonding property because of their shape memory effects. This paper proposes an adhesive unit that is capable of repeatable smart adhesion and exhibits reversible adhesion under heating.

Shape memory polymer composite structures with two-way shape memory effects

2012 ◽  
Vol 89 ◽  
pp. 216-218 ◽  
Author(s):  
Zhengdao Wang ◽  
Weibin Song ◽  
Liaoliang Ke ◽  
Yuesheng Wang
Keyword(s):  
Shape Memory ◽  
Polymer Composite ◽  
Composite Structures ◽  
Shape Memory Polymer ◽  
Memory Effects ◽  
Shape Memory Effects

Solar Light Responsive Polymer Composites with Three Shape-Memory Effects

2015 ◽  
Vol 301 (3) ◽  
pp. 267-273 ◽  
Author(s):  
Liang Fang ◽  
Tianyu Fang ◽  
Zhenggang Fang ◽  
Chunhua Lu ◽  
Zhongzi Xu
Keyword(s):  
Shape Memory ◽  
Polymer Composites ◽  
Memory Effects ◽  
Solar Light ◽  
Responsive Polymer ◽  
Shape Memory Effects

scholarly journals The Effect of 4-Octyldecyloxybenzoic Acid on Liquid-Crystalline Polyurethane Composites with Triple-Shape Memory and Self-Healing Properties

2016 ◽  
Author(s):  
Jianfeng Ban ◽  
Linjiang Zhu ◽  
Shaojun Chen ◽  
Yiping Wang
Keyword(s):  
Shape Memory ◽  
Liquid Crystalline ◽  
Crystallization Rate ◽  
Self Healing ◽  
Two Phase ◽  
Structure Morphology ◽  
Shape Memory Properties ◽  
Triple Shape Memory ◽  
Polyurethane Composites ◽  
Shape Memory Polyurethane

To better understand the shape memory materials and self-healing materials, a new series of liquid-crystalline shape memory polyurethane (LC-SMPU) composites, named SMPU-OOBAm, were successfully prepared by incorporating 4-octyldecyloxybenzoic acid (OOBA) into the PEG-based SMPU. The effect of OOBA on the structure, morphology and properties has been carefully investigated. The results demonstrate that SMPU-OOBAm have liquid crystalline properties, triple-shape memory properties and self-healing properties. The incorporated OOBA promotes the crystallizability of both soft and hard segments of SMPU, and the crystallization rate of the hard segment of SMPU decreases when the OOBA-content increases. Additionally, the SMPU-OOBAm forms a two-phase separated structure (SMPU phase and OOBA phase), and it shows two-step modulus changes upon heating. Therefore, the SMPU-OOBAm shows triple-shape memory behavior, and the shape recovery ratio decreases with an increase in the OOBA content. Finally, SMPU-OOBAm shows self-healing properties. The new mechanism can be ascribed to the heating-induced “bleeding” of OOBA in the liquid crystalline state and the subsequent re-crystallization upon cooling. This successful combination of liquid crystalline properties, triple-shape memory properties and self-healing properties make the SMPU-OOBAm composites with many promise applications in smart optical devices, smart electronic devices and smart sensors.

Development of zwitterionic polyurethanes with multi-shape memory effects and self-healing properties

2015 ◽  
Vol 3 (6) ◽  
pp. 2924-2933 ◽  
Author(s):  
Shaojun Chen ◽  
Funian Mo ◽  
Yan Yang ◽  
Florian J. Stadler ◽  
Shiguo Chen ◽  
...  
Keyword(s):  
Shape Memory ◽  
Memory Effects ◽  
Hexamethylene Diisocyanate ◽  
Self Healing ◽  
Shape Memory Properties ◽  
Shape Memory Effects

Novel zwitterionic polyurethanes containing sulfobetaines, featuring excellent multi-shape-memory properties and self-healing properties, are prepared from N-methyldiethanolamine, hexamethylene diisocyanate and 1,3-propanesultone.

Modeling of Polyurethane's Shape Memory Effects and Recovery Time under Different Recovery Temperatures

2013 ◽  
Vol 575-576 ◽  
pp. 95-100
Author(s):  
Ling Luo ◽  
Yu Xi Jia ◽  
Xiao Xia Wang ◽  
Zhao Jing Wang ◽  
Jun Peng Gao ◽  
...  
Keyword(s):  
Shape Memory ◽  
Recovery Time ◽  
Shape Memory Polymer ◽  
Memory Effects ◽  
Molecular Architecture ◽  
Thermally Induced ◽  
Shape Memory Effects ◽  
Viscoelastic Theory ◽  
Different Shapes ◽  
Good Agreement

Shape memory polymer (SMP), which has attracted lots of attentions recently, is a kind of smart material. The thermally induced SMPs can remember two different shapes because of the combined functions of polymers molecular architecture, morphology and the specific multi-step processing technology named shape memory creation programming. This paper aims to analyze Polyurethanes shape memory properties based on the viscoelastic theory. First, the Polyurethanes creep and relaxation performances are simulated using Maxwell-Weichert model. The simulated results of relaxation process are found in good agreement with the experimental results. Later, same model is used to describe Polyurethanes shape memory effects in strain-controlled situation. As the results show, Polyurethanes shape recovery ratios are almost 100%, whereas shape fixing properties are relatively poor. Moreover, as shown by the simulated results of recovery time under different recovery temperatures, recovery time shortens along with the increase of recovery temperature.

A novel shape memory polymer based on conetworks

e-Polymers ◽  
2009 ◽  
Vol 9 (1) ◽  
Author(s):  
Zonghui Li ◽  
Yi Pan ◽  
Peng Zhang ◽  
Zhaohui Zheng ◽  
Xiaobin Ding ◽  
...  
Keyword(s):  
Glass Transition ◽  
Shape Memory ◽  
Shape Memory Polymer ◽  
Recovery Ratio ◽  
Modulus Ratio ◽  
Poly Ethylene Glycol ◽  
Shape Memory Properties ◽  
Shape Memory Effects ◽  
Shape Memory Materials ◽  
Poly Ethylene

AbstractA novel shape memory polymer based on conetworks (CNs) was synthesized. These conetworks consisting of poly(methyl methacrylate) and poly (ethylene glycol) diacrylates showed excellent shape-memory properties with a recovery ratio of nearly 100%. Moreover, different shape memory effects were discovered in different mediums due to their amphiphilic properties. In addition, a large storage modulus ratio above and below the glass transition temperature(Eratio), which probably means excellent shape memory effect, were obtained due to the designed CN structure whether crystallization existed or not. It is quite different from the traditional methods to achieve large Eratio values. The versatility of shapememory conetworks potentially provides us a new route to prepare shape memory materials.

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