Electromagnetic Activation of Shape Memory Polymer Networks Containing Magnetic Nanoparticles

2006 ◽  
Vol 27 (14) ◽  
pp. 1168-1172 ◽  
Author(s):  
Annette M. Schmidt
Keyword(s):  
Magnetic Nanoparticles ◽  
Shape Memory ◽  
Shape Memory Polymer ◽  
Polymer Networks ◽  
Electromagnetic Activation

Photo-Cross-Linkable Coumarin-Based Poly(ε-caprolactone) for Light-Controlled Design and Reconfiguration of Shape-Memory Polymer Networks

2018 ◽  
Vol 52 (2) ◽  
pp. 444-456 ◽  
Author(s):  
Thomas Defize ◽  
Jean-Michel Thomassin ◽  
Heidi Ottevaere ◽  
Cédric Malherbe ◽  
Gauthier Eppe ◽  
...  
Keyword(s):  
Shape Memory ◽  
Shape Memory Polymer ◽  
Polymer Networks

Shape memory polymer networks from styrene copolymer

2007 ◽  
Author(s):  
Dawei Zhang ◽  
Xiaoguang Wang ◽  
Wuyi Zhang ◽  
Yanju Liu ◽  
Jinsong Leng
Keyword(s):  
Shape Memory ◽  
Shape Memory Polymer ◽  
Polymer Networks ◽  
Styrene Copolymer

Shape-memory polymer networks from oligo(?-caprolactone)dimethacrylates

2005 ◽  
Vol 43 (7) ◽  
pp. 1369-1381 ◽  
Author(s):  
Andreas Lendlein ◽  
Annette M. Schmidt ◽  
Michael Schroeter ◽  
Robert Langer
Keyword(s):  
Shape Memory ◽  
Shape Memory Polymer ◽  
Polymer Networks

Thermo-mechanical Behavior of (Meth)Acrylate Shape-Memory Polymer Networks

2011 ◽  
Vol 1312 ◽  
Author(s):  
Carl P. Frick ◽  
Nishant Lakhera ◽  
Christopher M. Yakacki
Keyword(s):  
Shape Memory ◽  
Shape Memory Polymer ◽  
Polymer Network ◽  
Polymer Networks ◽  
Weight Fraction ◽  
Crosslinking Density ◽  
Mechanical Stiffness ◽  
Actuation Force ◽  
Order Of Magnitude ◽  
Cross Linker

ABSTRACTOur overall approach is based on developing a photocrosslinkable polymer network with a favorable shape-memory response, using polymer chemistry and crosslinking density to control thermo-mechanical properties. Three polymer networks were created and thermo-mechanically tested, each from tert-Butyl acrylate linear builder co-polymerized with a poly(ethylene glycol) dimethacrylate cross-linker. By systematically altering the molecular weight and the weight fraction of the cross-linker, it was possible to create three polymers that exhibited the same glass transition temperature, but varied by almost an order of magnitude in rubbery modulus. Therefore, the mechanical stiffness could be tailored to suit a given application. Recovery behavior of the polymers was characterized over a range of deformation temperatures. It has been implicitly assumed a linear relationship between Free-Strain (i.e. no actuation force) and Fixed-Stress (i.e. maximum actuation force), however, this has never been confirmed experimentally. The energy per unit volume performed by the shape-memory polymer was quantified, and observed to be a function of strain recovered. The maximum recoverable work was shown to increase with cross-linking density, although the overall efficiency is similar for all materials tested.

Body temperature-responsive two-way and moisture-responsive one-way shape memory behaviors of poly(ethylene glycol)-based networks

2017 ◽  
Vol 8 (25) ◽  
pp. 3833-3840 ◽  
Author(s):  
Guang Yang ◽  
Xueyang Liu ◽  
Alfred Iing Yoong Tok ◽  
Vitali Lipik
Keyword(s):  
Free Radical ◽  
Ethylene Glycol ◽  
Shape Memory ◽  
Shape Memory Polymer ◽  
Polymer Networks ◽  
Poly Ethylene Glycol ◽  
Thermally Induced ◽  
Temperature Responsive ◽  
Shape Memory Effects ◽  
Poly Ethylene

In this work, crosslinked shape-memory polymer networks were prepared by thermally induced free-radical polymerizations of methacrylate-terminated poly(ethylene glycol) (PEG) and n-butyl acrylate (BA), which integrate thermal-responsive two-way and moisture-responsive one-way shape memory effects (SME).

scholarly journals Shape memory polymer networks based on methacrylated fatty acids

2019 ◽  
Vol 116 ◽  
pp. 321-329 ◽  
Author(s):  
Guillermina Capiel ◽  
Norma E. Marcovich ◽  
Mirna A. Mosiewicki
Keyword(s):  
Fatty Acids ◽  
Shape Memory ◽  
Shape Memory Polymer ◽  
Polymer Networks

Cytotoxicity and thermomechanical behavior of biomedical shape-memory polymer networks post-sterilization

2008 ◽  
Vol 3 (1) ◽  
pp. 015010 ◽  
Author(s):  
C M Yakacki ◽  
M B Lyons ◽  
B Rech ◽  
K Gall ◽  
R Shandas
Keyword(s):  
Shape Memory ◽  
Shape Memory Polymer ◽  
Polymer Networks ◽  
Thermomechanical Behavior

Thermally-Induced Actuation of Magnetic Nanocomposites Based on Oligo(ω-Pentadecalactone) and Covalently Integrated Magnetic Nanoparticles

MRS Advances ◽  
2018 ◽  
Vol 3 (63) ◽  
pp. 3783-3791 ◽  
Author(s):  
M. Yasar Razzaq ◽  
M. Behl ◽  
A. Lendlein
Keyword(s):  
Magnetic Nanoparticles ◽  
Mechanical Performance ◽  
Shape Memory Polymer ◽  
Polymer Network ◽  
Polymer Networks ◽  
Melting Range ◽  
Magnetite Nanoparticle ◽  
Thermally Induced ◽  
Inorganic Particles ◽  
Chain Mobility

AbstractThe incorporation of inorganic particles in a polymer matrix has been established as a method to adjust the mechanical performance of composite materials. We report on the influence of covalent integration of magnetic nanoparticles (MNP) on the actuation behavior and mechanical performance of hybrid nanocomposite (H-NC) based shape-memory polymer actuators (SMPA). The H-NC were synthesized by reacting two types of oligo(ω-pentadecalactone) (OPDL) based precursors with terminal hydroxy groups, a three arm OPDL (3AOPDL, Mn = 6000 g mol·1-1) and an OPDL (Mn =3300 g · mol-1) coated magnetite nanoparticle (Ø = 10 ± 2 nm), with a diisocyanate. These H-NC were compared to the homopolymer network regarding the actuation performance, contractual stress (σcontr) as well as thermal and mechanical properties. The melting range of the OPDL crystals (ΔTm,OPDL) was shifted in homo polymer networks from 36 °C – 76 °C to 41°C – 81 °C for H-NC with 9 wt% of MNP content. The actuators were explored by variation of separating temperature (Tsep), which splits the OPDL crystalline domain into actuating and geometry determining segments. Tsep was varied in the melting range of the nanocomposites and the actuation capability and contractual stress (σcontr) of the nanocomposite actuators could be adjusted. The reversible strain (εrev) was decreased from 11 ± 0.3% for homo polymer network to 3.2±0.3% for H-NC9 with 9 wt% of MNP indicating a restraining effect of the MNP on chain mobility. The results show that the performance of H-NCs in terms of thermal and elastic properties can be tailored by MNP content, however for higher reversible actuation, lower MNP contents are preferable.

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