Thermomechanical and water-responsive shape memory properties of carbon nanotubes-reinforced hyperbranched polyurethane composites

2012 ◽  
Vol 127 (4) ◽  
pp. 2670-2677 ◽  
Author(s):  
Sravendra Rana ◽  
Jae Whan Cho ◽  
Jong-Shin Park
Keyword(s):  
Carbon Nanotubes ◽  
Shape Memory ◽  
Hyperbranched Polyurethane ◽  
Shape Memory Properties ◽  
Polyurethane Composites

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.

Electroactive Shape-Memory Polyurethane Composites Incorporating Carbon Nanotubes

2005 ◽  
Vol 26 (5) ◽  
pp. 412-416 ◽  
Author(s):  
Jae Whan Cho ◽  
Jeong Won Kim ◽  
Yong Chae Jung ◽  
Nam Seo Goo
Keyword(s):  
Carbon Nanotubes ◽  
Shape Memory ◽  
Polyurethane Composites ◽  
Shape Memory Polyurethane

Tailored and strong electro-responsive shape memory actuation in carbon nanotube-reinforced hyperbranched polyurethane composites

2014 ◽  
Vol 193 ◽  
pp. 384-390 ◽  
Author(s):  
Sibdas Singha Mahapatra ◽  
Santosh Kumar Yadav ◽  
Hye Jin Yoo ◽  
Madeshwaran Sekkarapatti Ramasamy ◽  
Jae Whan Cho
Keyword(s):  
Carbon Nanotube ◽  
Shape Memory ◽  
Hyperbranched Polyurethane ◽  
Polyurethane Composites

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.

Sign in / Sign up

Export Citation Format

Share Document