Improved shape memory effects in multiwalled-carbon-nano-tube reinforced thermosetting polyurethane composites

2016 ◽  
Vol 134 (7) ◽  
Author(s):  
Harish Chandra Prasad ◽  
S. A. R Hashmi ◽  
Ajay Naik ◽  
Hari Narayan Bhargaw
Keyword(s):  
Shape Memory ◽  
Memory Effects ◽  
Multiwalled Carbon ◽  
Shape Memory Effects ◽  
Polyurethane Composites ◽  
Carbon Nano Tube

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.

Liquid crystalline polyurethane composites based on supramolecular structure with reversible bidirectional shape memory and multi-shape memory effects

2019 ◽  
Vol 43 (1) ◽  
pp. 103-110 ◽  
Author(s):  
Funian Mo ◽  
Jianfeng Ban ◽  
Lulu Pan ◽  
Bo Shi ◽  
Shaorong Lu
Keyword(s):  
Shape Memory ◽  
Supramolecular Structure ◽  
Liquid Crystalline ◽  
Memory Effects ◽  
Molar Ratio ◽  
Shape Memory Effects ◽  
Polyurethane Composites

In this study, a novel series of supramolecular liquid crystalline (LC) polyurethane composites, named SMPU–#HOBA (# represents the molar ratio of HOBA/BINA), were successfully prepared by incorporating hexadecyloxybenzoic acid (HOBA) into pyridine-containing polyurethane (PU).

scholarly journals Multiwalled Carbon Nanotube Reinforced Bio-Based Benzoxazine/Epoxy Composites with NIR-Laser Stimulated Shape Memory Effects

Nanomaterials ◽  
2019 ◽  
Vol 9 (6) ◽  
pp. 881 ◽  
Author(s):  
Wassika Prasomsin ◽  
Tewarak Parnklang ◽  
Chaweewan Sapcharoenkun ◽  
Sunan Tiptipakorn ◽  
Sarawut Rimdusit
Keyword(s):  
Shape Memory ◽  
Shape Recovery ◽  
Recovery Process ◽  
Memory Effects ◽  
Molecular Characteristics ◽  
Multiwalled Carbon ◽  
Dynamic Mechanical ◽  
Good Shape ◽  
Shape Memory Effects ◽  
Nir Laser

Smart materials with light-actuated shape memory effects are developed from renewable resources in this work. Bio-based benzoxazine resin is prepared from vanillin, furfurylamine, and paraformaldehyde by utilizing the Mannich-like condensation. Vanillin-furfurylamine-containing benzoxazine resin (V-fa) is subsequently copolymerized with epoxidized castor oil (ECO). When the copolymer is reinforced with multiwalled carbon nanotubes (MWCNTs), the resulting composite exhibits shape memory effects. Molecular characteristics of V-fa resin, ECO, and V-fa/ECO copolymers are obtained from Fourier transform infrared (FT-IR) spectroscopy. Curing behavior of V-fa/ECO copolymers is investigated by differential scanning calorimetry. Dynamic mechanical properties of MWCNT reinforced V-fa/ECO composites are determined by dynamic mechanical analysis. Morphological details and distribution of MWCNTs within the copolymer matrix are characterized by transmission electron microscopy. Shape memory performances of MWCNT reinforced V-fa/ECO composites are studied by shape memory tests performed with a universal testing machine. After a significant deformation to a temporary shape, the composites can be recovered to the original shape by near-infrared (NIR) laser actuation. The shape recovery process can be stimulated at a specific site of the composite simply by focusing NIR laser to that site. The shape recovery time of the composites under NIR actuation is four times faster than the shape recovery process under conventional thermal activation. Furthermore, the composites possess good shape fixity and good shape recovery under NIR actuation.

scholarly journals Harnessing reversible dry adhesion using shape memory polymer microparticles

RSC Advances ◽  
2021 ◽  
Vol 11 (32) ◽  
pp. 19616-19622
Author(s):  
Wenbing Li ◽  
Junhao Liu ◽  
Wanting Wei ◽  
Kun Qian
Keyword(s):  
Shape Memory ◽  
Shape Memory Polymer ◽  
Shape Memory Polymers ◽  
Memory Effects ◽  
Reversible Adhesion ◽  
Dry Adhesion ◽  
Bonding Property ◽  
Shape Memory Effects ◽  
Polymer Microparticles

Shape memory polymers can provide excellent bonding property because of their shape memory effects. This paper proposes an adhesive unit that is capable of repeatable smart adhesion and exhibits reversible adhesion under heating.

Multi-shape-memory effects in a wavelength-selective multicomposite

2015 ◽  
Vol 3 (26) ◽  
pp. 13953-13961 ◽  
Author(s):  
Li Yu ◽  
Qian Wang ◽  
Jian Sun ◽  
Chenyue Li ◽  
Cheng Zou ◽  
...  
Keyword(s):  
Shape Memory ◽  
Memory Effects ◽  
Shape Memory Effects

Tuneable shape-memory effects can be achieved in a wavelength-selective multicomposite.

Polyurethane foam/silica chemical hybrids for shape memory effects

2012 ◽  
Vol 27 (22) ◽  
pp. 2837-2843 ◽  
Author(s):  
S.M. Kang ◽  
M.J. Kim ◽  
S.H. Kwon ◽  
H. Park ◽  
H.M. Jeong ◽  
...  
Keyword(s):  
Shape Memory ◽  
Polyurethane Foam ◽  
Memory Effects ◽  
Shape Memory Effects ◽  
Image Position

Abstract

scholarly journals Epoxy Resin Composite Bilayers with Triple-Shape Memory Effect

2015 ◽  
Vol 2015 ◽  
pp. 1-8 ◽  
Author(s):  
Xixi Li ◽  
Yaofeng Zhu ◽  
Yubing Dong ◽  
Meng Liu ◽  
Qingqing Ni ◽  
...  
Keyword(s):  
Glass Transition ◽  
Electron Microscope ◽  
Shape Memory ◽  
Memory Effects ◽  
Epoxy Composites ◽  
Transition Temperatures ◽  
Glass Transition Temperatures ◽  
Shape Memory Effects ◽  
Triple Shape Memory ◽  
Nanosilica Particles

Triple-shape memory epoxy composites with bilayer structures of well-separated glass transition temperatures have been successfully prepared. The different glass transition temperatures of the epoxy composites were obtained by physically incorporating various amounts of nanosilica particles, which were introduced into the epoxy by utilizing polyethylene glycol. A scanning electron microscope and a transmission electron microscope were used to analyze the dispersibility of the nanosilica particles. The effects of nanosilica particles on the mechanical properties as well as on the dual-shape memory effects (DSME) and triple-shape memory effects (TSME) of the nanocomposites were studied. The nanosilica particles were homogenously dispersed in the matrix and well incorporated into the epoxy matrix. The resulting nanocomposites exhibited excellent TSME, and their shape fixity properties were significantly improved by nanosilica particles.

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