Photoinduced triple shape memory polyurethane enabled by doping with azobenzene and GO

2016 ◽  
Vol 4 (42) ◽  
pp. 9993-9997 ◽  
Author(s):  
Liming Zhou ◽  
Qiang Liu ◽  
Xuande Lv ◽  
Lijun Gao ◽  
Shaoming Fang ◽  
...  
Keyword(s):  
Shape Memory ◽  
Nanocomposite Film ◽  
Polymer Dispersed ◽  
Triple Shape Memory ◽  
Shape Memory Polyurethane

A polymer-dispersed azobenzene and GO nanocomposite film was fabricated with shape memory polyurethane as a matrix.

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.

Design of Triple-Shape Memory Polyurethane with Photo-cross-linking of Cinnamon Groups

2013 ◽  
Vol 5 (21) ◽  
pp. 10520-10528 ◽  
Author(s):  
Lin Wang ◽  
Xifeng Yang ◽  
Hongmei Chen ◽  
Tao Gong ◽  
Wenbing Li ◽  
...  
Keyword(s):  
Shape Memory ◽  
Cross Linking ◽  
Triple Shape Memory ◽  
Shape Memory Polyurethane

scholarly journals Synthesis of cross-linked triple shape memory polyurethane with self-healing functionalities

2021 ◽  
Vol 96 ◽  
pp. 107099
Author(s):  
Wenwen Zhang ◽  
Xuefei Leng ◽  
Mengyun Gao ◽  
Zhiyong Wei ◽  
Yiying Wang ◽  
...  
Keyword(s):  
Shape Memory ◽  
Self Healing ◽  
Triple Shape Memory ◽  
Shape Memory Polyurethane

Development of liquid-crystalline shape-memory polyurethane composites based on polyurethane with semi-crystalline reversible phase and hexadecyloxybenzoic acid for self-healing applications

2014 ◽  
Vol 2 (21) ◽  
pp. 4203-4212 ◽  
Author(s):  
Shaojun Chen ◽  
Hongming Yuan ◽  
Haitao Zhuo ◽  
Shiguo Chen ◽  
Haipeng Yang ◽  
...  
Keyword(s):  
Shape Memory ◽  
Liquid Crystalline ◽  
Self Healing ◽  
Triple Shape Memory ◽  
Polyurethane Composites ◽  
Shape Memory Polyurethane ◽  
Reversible Phase

Novel liquid crystalline shape memory polyurethane composites display liquid crystalline properties, triple-shape memory behaviours and self-healing behaviours.

Thermo- and pH-sensitive shape memory polyurethane containing carboxyl groups

2016 ◽  
Vol 7 (9) ◽  
pp. 1739-1746 ◽  
Author(s):  
Qiuju Song ◽  
Hongmei Chen ◽  
Shaobing Zhou ◽  
Keqing Zhao ◽  
Biqing Wang ◽  
...  
Keyword(s):  
Carboxylic Acid ◽  
Shape Memory ◽  
Shape Memory Effect ◽  
Memory Effect ◽  
Ph Sensitive ◽  
Carboxyl Groups ◽  
Triple Shape Memory ◽  
Shape Memory Polyurethane

A type of polyurethane with carboxylic acid, exhibits a thermo-induced triple-shape memory effect and a pH sensitive dual-shape memory effect.

Three-dimensional Graphene Coated Shape Memory Polyurethane Foam with Fast Responsive Performance

2021 ◽  
Author(s):  
Tianjiao Wang ◽  
Jun Zhao ◽  
Chuanxin Weng ◽  
Tong Wang ◽  
Yayun Liu ◽  
...  
Keyword(s):  
Shape Memory ◽  
Polyurethane Foam ◽  
Three Dimensional ◽  
Shape Memory Polymers ◽  
Practical Applications ◽  
External Stimuli ◽  
Shape Memory Polyurethane

Shape memory polymers (SMPs) that change shapes as designed by external stimuli have become one of the most promising materials as actuators, sensors, and deployable devices. However, their practical applications...

scholarly journals In Situ Generation of Green Hybrid Nanofibrillar Polymer-Polymer Composites—A Novel Approach to the Triple Shape Memory Polymer Formation

Polymers ◽  
2021 ◽  
Vol 13 (12) ◽  
pp. 1900
Author(s):  
Ramin Hosseinnezhad ◽  
Iurii Vozniak ◽  
Fahmi Zaïri
Keyword(s):  
Polymer Blends ◽  
Shape Memory ◽  
Shape Memory Polymer ◽  
Cellulose Nanofibers ◽  
Polymeric Materials ◽  
Novel Approach ◽  
Phase Transition Temperatures ◽  
Triple Shape Memory

The paper discusses the possibility of using in situ generated hybrid polymer-polymer nanocomposites as polymeric materials with triple shape memory, which, unlike conventional polymer blends with triple shape memory, are characterized by fully separated phase transition temperatures and strongest bonding between the polymer blends phase interfaces which are critical to the shape fixing and recovery. This was demonstrated using the three-component system polylactide/polybutylene adipateterephthalate/cellulose nanofibers (PLA/PBAT/CNFs). The role of in situ generated PBAT nanofibers and CNFs in the formation of efficient physical crosslinks at PLA-PBAT, PLA-CNF and PBAT-CNF interfaces and the effect of CNFs on the PBAT fibrillation and crystallization processes were elucidated. The in situ generated composites showed drastically higher values of strain recovery ratios, strain fixity ratios, faster recovery rate and better mechanical properties compared to the blend.

scholarly journals Thermo-mechanical behavior and structure of melt blown shape-memory polyurethane nonwovens

2016 ◽  
Vol 62 ◽  
pp. 545-555 ◽  
Author(s):  
David L. Safranski ◽  
Jennifer M. Boothby ◽  
Cambre N. Kelly ◽  
Kyle Beatty ◽  
Nishant Lakhera ◽  
...  
Keyword(s):  
Mechanical Behavior ◽  
Shape Memory ◽  
Shape Memory Polyurethane
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