UV curable micro‐structured shape memory epoxy with tunable performance

2021 ◽  
pp. 51319
Author(s):  
Hua Ren ◽  
Lulin Xie ◽  
Yang Xu ◽  
Qian Zhao ◽  
Ning Zheng
Keyword(s):  
Shape Memory ◽  
Uv Curable

Shape‐Memory Polymers: Mechanically Robust and UV‐Curable Shape‐Memory Polymers for Digital Light Processing Based 4D Printing (Adv. Mater. 27/2021)

2021 ◽  
Vol 33 (27) ◽  
pp. 2170210
Author(s):  
Biao Zhang ◽  
Honggeng Li ◽  
Jianxiang Cheng ◽  
Haitao Ye ◽  
Amir Hosein Sakhaei ◽  
...  
Keyword(s):  
Shape Memory ◽  
Shape Memory Polymers ◽  
4D Printing ◽  
Digital Light Processing ◽  
Uv Curable

Bio-based UV curable polyurethane acrylate: Morphology and shape memory behaviors

2019 ◽  
Vol 118 ◽  
pp. 514-527 ◽  
Author(s):  
Samaneh Salkhi Khasraghi ◽  
Akbar Shojaei ◽  
Uttandaraman Sundararaj
Keyword(s):  
Shape Memory ◽  
Uv Curable ◽  
Polyurethane Acrylate

scholarly journals Electrical Properties of Thiol-ene-based Shape Memory Polymers Intended for Flexible Electronics

Polymers ◽  
2019 ◽  
Vol 11 (5) ◽  
pp. 902 ◽  
Author(s):  
Christopher L. Frewin ◽  
Melanie Ecker ◽  
Alexandra Joshi-Imre ◽  
Jonathan Kamgue ◽  
Jeanneane Waddell ◽  
...  
Keyword(s):  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Electrical Properties ◽  
Shape Memory ◽  
Flexible Electronics ◽  
Shape Memory Polymers ◽  
Curing Process ◽  
Uv Curable ◽  
Processing Technologies

Thiol-ene/acrylate-based shape memory polymers (SMPs) with tunable mechanical and thermomechanical properties are promising substrate materials for flexible electronics applications. These UV-curable polymer compositions can easily be polymerized onto pre-fabricated electronic components and can be molded into desired geometries to provide a shape-changing behavior or a tunable softness. Alternatively, SMPs may be prepared as a flat substrate, and electronic circuitry may be built directly on top by thin film processing technologies. Whichever way the final structure is produced, the operation of electronic circuits will be influenced by the electrical and mechanical properties of the underlying (and sometimes also encapsulating) SMP substrate. Here, we present electronic properties, such as permittivity and resistivity of a typical SMP composition that has a low glass transition temperature (between 40 and 60 °C dependent on the curing process) in different thermomechanical states of polymer. We fabricated parallel plate capacitors from a previously reported SMP composition (fully softening (FS)-SMP) using two different curing processes, and then we determined the electrical properties of relative permittivity and resistivity below and above the glass transition temperature. Our data shows that the curing process influenced the electrical permittivity, but not the electrical resistivity. Corona-Kelvin metrology evaluated the quality of the surface of FS-SMP spun on the wafer. Overall, FS-SMP demonstrates resistivity appropriate for use as an insulating material.

Mechanically Robust and UV‐Curable Shape‐Memory Polymers for Digital Light Processing Based 4D Printing

2021 ◽  
pp. 2101298
Author(s):  
Biao Zhang ◽  
Honggeng Li ◽  
Jianxiang Cheng ◽  
Haitao Ye ◽  
Amir Hosein Sakhaei ◽  
...  
Keyword(s):  
Shape Memory ◽  
Shape Memory Polymers ◽  
4D Printing ◽  
Digital Light Processing ◽  
Uv Curable

Self-healing, recyclable, and shape memory UV-curable coatings derived from tung oil and malic acid

2021 ◽  
Author(s):  
Jinshuai Zhang ◽  
Jia Huang ◽  
Guoqiang Zhu ◽  
Xixi Yu ◽  
Jianwen Cheng ◽  
...  
Keyword(s):  
Shape Memory ◽  
Malic Acid ◽  
Renewable Resources ◽  
Microwave Assisted Synthesis ◽  
Self Healing ◽  
Uv Curable ◽  
Dynamic Covalent Chemistry ◽  
Tung Oil ◽  
Microwave Assisted ◽  
Smart Coatings

This study reports the development of super “green” smart coatings by integrating renewable resources, microwave-assisted synthesis, and dynamic covalent chemistry into UV-curable coatings. First, a novel UV-curable oligomer (TMG) was...

A UV-curable epoxy with “soft” segments for 3D-printable shape-memory materials

2018 ◽  
Vol 53 (17) ◽  
pp. 12650-12661 ◽  
Author(s):  
Jing Wang ◽  
Zhongmin Xue ◽  
Gang Li ◽  
Yu Wang ◽  
Xuewei Fu ◽  
...  
Keyword(s):  
Shape Memory ◽  
Uv Curable ◽  
Soft Segments ◽  
Shape Memory Materials

Tensile Failure of 55-Nitinol Wire

1975 ◽  
Vol 33 ◽  
pp. 46-47
Author(s):  
F. I. Grace
Keyword(s):  
Shape Memory ◽  
Shape Memory Effect ◽  
Memory Effect ◽  
Stoichiometric Composition ◽  
Tensile Failure ◽  
Initial State ◽  
Initial Shape ◽  
Nitinol Wire ◽  
Cscl Type ◽  
Shear Transformation

An interest in NiTi alloys with near stoichiometric composition (55 NiTi) has intensified since they were found to exhibit a unique mechanical shape memory effect at the Naval Ordnance Laboratory some twelve years ago (thus refered to as NITINOL alloys). Since then, the microstructural mechanisms associated with the shape memory effect have been investigated and several interesting engineering applications have appeared.The shape memory effect implies that the alloy deformed from an initial shape will spontaneously return to that initial state upon heating. This behavior is reported to be related to a diffusionless shear transformation which takes place between similar but slightly different CsCl type structures.

TEM study of order, structure and defects of β and martensite in Cu-Al-Mn shape memory alloys

1990 ◽  
Vol 48 (4) ◽  
pp. 188-189
Author(s):  
J.M. Guilemany ◽  
F. Peregrin
Keyword(s):  
Shape Memory ◽  
Orthophosphoric Acid ◽  
Isopropyl Alcohol ◽  
Metastable Phase ◽  
Characteristic Temperature ◽  
Ethanol Solution ◽  
Order Structure ◽  
Thin Foils ◽  
Polycrystalline Alloys ◽  
Diamond Saw

The shape memory effect (SME) shown by Cu-Al-Mn alloys stems from the thermoelastic martensitic transformation occuring between a β (L2,) metastable phase and a martensitic phase. The TEM study of both phases in single and polycrystalline Cu-Al-Mn alloys give us greater knowledge of the structure, order and defects.The alloys were obtained by vacuum melting of Cu, Al and Mn and single crystals were obtained from polycrystalline alloys using a modified Bridgman method. Four different alloys were used with (e/a) ranging from 1.41 to 1.46 . Two different heat treatments were used and the alloys also underwent thermal cycling throughout their characteristic temperature range -Ms, Mf, As, Af-. The specimens were cut using a low speed diamond saw and discs were mechanically thinned to 100 μm and then ion milled to perforation at 4 kV. Some thin foils were also prepared by twin-jet electropolishing, using a (1:10:50:50) urea: isopropyl alcohol: orthophosphoric acid: ethanol solution at 20°C. The foils were examinated on a TEM operated at 200 kV.

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