Properties of shape memory polyurethane used as a low-temperature thermoplastic biomedical orthotic material: influence of hard segment content

2008 ◽  
Vol 19 (11) ◽  
pp. 1437-1454 ◽  
Author(s):  
Qinghao Meng ◽  
Jinlian Hu ◽  
Yong Zhu
Keyword(s):  
Low Temperature ◽  
Shape Memory ◽  
Hard Segment ◽  
Hard Segment Content ◽  
Shape Memory Polyurethane

Effect of steaming on shape memory polyurethane fibers with various hard segment contents

2007 ◽  
Vol 16 (4) ◽  
pp. 969-981 ◽  
Author(s):  
Yong Zhu ◽  
Jinlian Hu ◽  
Lap-Yan Yeung ◽  
Jing Lu ◽  
Qinghao Meng ◽  
...  
Keyword(s):  
Shape Memory ◽  
Hard Segment ◽  
Shape Memory Polyurethane

Effects of Ionic Group on the Shape Memory Performance of Polyurethane

2016 ◽  
Vol 848 ◽  
pp. 140-147
Author(s):  
Yan Ou Hu ◽  
Hui Qin Lian ◽  
Lei Zu ◽  
Yue Ting Li ◽  
Yang Liu ◽  
...  
Keyword(s):  
Shape Memory ◽  
Hard Segment ◽  
Soft Segment ◽  
Memory Performance ◽  
Average Molecular Weight ◽  
Phenyl Isocyanate ◽  
Exchange Capacity ◽  
Gravimetric Analysis ◽  
X Ray Diffraction ◽  
Hard Segment Content

Ionic polyurethane (IPU) was synthesized as shape memory materials. Poly (tetramethylene ether) glycol with 2000g/mol number average molecular weight were used as soft segment, 4,4-methylenebis (phenyl isocyanate), and 1,2-dihydroxy-3-propanesulfonic acid salt were used to compose the segment of SMP materials. The structure and properties of these IPU films were characterized by Fourier Transform infrared, X-ray diffraction, Thermal gravimetric analysis and Differential scanning calorimeter. The results showed that the glass transition temperature of the IPU increased with the increase of hard segment content. The physical properties in terms of swelling property, water absorption and ion-exchange capacity increased with the improving of sulfonic group content in IPU. The shape memory property of IPU exhibited that the shape fixity ratio and recovery rate improved remarkably with the increase of hard segment content.

scholarly journals Efficacy of Gold Photothermal-Activated Shape Memory Polyurethane

2020 ◽  
Vol 2020 ◽  
pp. 1-8 ◽  
Author(s):  
Christopher J. Ward ◽  
Robert Tonndorf ◽  
Alicia Eustes ◽  
Maria L. Auad ◽  
Edward W. Davis
Keyword(s):  
Composite Material ◽  
Shape Memory ◽  
Gold Nanorods ◽  
Hard Segment ◽  
Infrared Irradiation ◽  
Shape Memory Behavior ◽  
Irradiation Intensity ◽  
Thermally Activated ◽  
Solution Blending ◽  
Shape Memory Polyurethane

The addition of gold nanorods to a commercial polyurethane enabled shape memory behavior activation via infrared irradiation. The fraction of the set strain recovered was found to be dependent on the nanorod loading and irradiation intensity. A nanocomposite consisting of gold nanorods with an aspect ratio of ~3.25 and a diameter of ~11.5 nm and the polyurethane IROGRAN PS455-203 was prepared via a simple solution blending technique. Gold loadings up to 3.2 ppm by weight were evaluated. The glass transition temperature and melting point of the hard-segment phase was slightly depressed at the highest loading evaluated. Other thermal properties were not affected by the addition of gold nanorods. Also, the thermally activated shape memory behavior of the composite material was not affected by the presence of the gold nanorods.

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...

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