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.

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

Thermally activated shape memory behavior of melt-mixed polyurethane/cellulose nanocrystal composites

2017 ◽  
Vol 134 (27) ◽  
pp. 45033 ◽  
Author(s):  
Apiradee Nicharat ◽  
Anuja Shirole ◽  
E. Johan Foster ◽  
Christoph Weder
Keyword(s):  
Shape Memory ◽  
Cellulose Nanocrystal ◽  
Shape Memory Behavior ◽  
Thermally Activated

scholarly journals Thermally activated shape memory behavior of copolymers based on ethylene reinforced with silica nanoparticles

2018 ◽  
Vol 4 (2) ◽  
pp. 19-35 ◽  
Author(s):  
Valentina Sessini ◽  
David Brox ◽  
Antonio Julio López ◽  
Alejandro Ureña ◽  
Laura Peponi
Keyword(s):  
Shape Memory ◽  
Silica Nanoparticles ◽  
Shape Memory Behavior ◽  
Thermally Activated

Thermo-Mechanical Testing of Epoxy Shape Memory Polymer Composites

2012 ◽  
Vol 570 ◽  
pp. 15-23 ◽  
Author(s):  
Abdul Basit ◽  
Gildas L’Hostis ◽  
Bernard Durand
Keyword(s):  
Composite Material ◽  
Glass Transition ◽  
Transition Temperature ◽  
Shape Memory ◽  
Shape Memory Polymer ◽  
Epoxy Composites ◽  
Shape Memory Property ◽  
Recovery Test ◽  
Thermally Activated ◽  
Displacement Measurements

In this work the two epoxy composites the controlled behavior of composite material (CBCM) and the thermally activated symmetrical composite (SYMM) have been tested for their shape memory property. These composites have been heated above their glass transition temperature (Tg) and deformed to the same displacement. The activated position has been taken as the reference point for displacement measurements during the fixing cycle. During the recovery, two types of tests have been conducted: Unconstrained recovery test and constrained recovery test. It has been found that the recovery of CBCM plate is better as compared to the SYMM plate (unconstrained recovery test). Similarly, it has been found that CBCM plate produces larger forces of recovery than SYMM plates (constrained recovery test).

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