Determination of Shape Fixity and Shape Recovery Rate of Carbon Nanotube-filled Shape Memory Polymer Nanocomposites

Abdullah, Sukarnur Che; Jumahat, Aidah; Abdullah, Nik Rosli; Frormann, Lars

doi:10.1016/j.proeng.2012.07.362

Cited by 61 publications

(46 citation statements)

References 13 publications

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“…According to DMTA results, these lower R r values for the first cycle in nanocomposites with high CNC load can probably be ascribed to the limited movement of the polymer chains due to interactions with CNCs. 56 An increased CNC content strongly decreases the magnitude of the transition associated with first delta tangent peak indicating that less mobile units at the recovery temperature of 45 C were participating in the relaxation processes resulting in higher non-reversible deformation for 5 and 10 wt % CNC samples during the first cycle (hysteresis). However, in the second cycle the R r % becomes significantly higher and stabilizes at values of 99% in the third and fourth cycles.…”

Section: Thermally Activated Shape-memory Propertiesmentioning

confidence: 98%

Mechanical and shape‐memory properties of poly(mannitol sebacate)/cellulose nanocrystal nanocomposites

Sonseca

Camarero‐Espinosa

Peponi

et al. 2014

J. Polym. Sci. Part A: Polym. Chem.

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Polyesters based on polyols and sebacic acid, known as poly(polyol sebacate)s (PPS), are attracting considerable attention, as their properties are potentially useful in the context of soft‐tissue engineering applications. To overcome the drawback that PPSs generally display rather low strength and stiffness, we have pursued the preparation of nanocomposites based poly(mannitol sebacate) (PMS), a prominent example of this materials family, with cellulose nanocrystals (CNCs). Nanocomposites were achieved in a two‐step process. A soluble, low‐molecular‐weight PMS pre‐polymer was formed via the polycondensation reaction between sebacic acid and D‐mannitol. Nanocomposites with different CNC content were prepared by solution‐casting and curing under vacuum using two different profiles designed to prepare materials with low and high degree of crosslinking. The as‐prepared nanocomposites have higher stiffness and toughness than the neat PMS matrix while maintaining a high elongation at break. A highly crosslinked nanocomposite with a CNC content of 5 wt % displays a sixfold increase in Young's modulus and a fivefold improvement in toughness. Nanocomposites also exhibit a shape memory effect with a switch temperature in the range of 15 to 45 °C; in particular the materials with a thermal transition in the upper part of this range are potentially useful for biomedical applications. © 2014 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2014, 52, 3123–3133

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Section: Thermally Activated Shape-memory Propertiesmentioning

confidence: 98%

Mechanical and shape‐memory properties of poly(mannitol sebacate)/cellulose nanocrystal nanocomposites

Sonseca

Camarero‐Espinosa

Peponi

et al. 2014

J. Polym. Sci. Part A: Polym. Chem.

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“…Biocompatibility of these polymers is well‐established and they have been used as medical implants such as vascular stents, SMP wires for thrombus removal, and dialysis needle adapters . Additionally, nanocomposites of the Mitsubishi SMPs have been developed to serve as reinforced composites in various applications . MM3520 foams were fabricated by Abdullah et al to enhance the shape memory effect of the materials and their studies showed an increase in the shape fixity of the material at low concentrations of carbon nanotubes …”

Section: Classes Of Porous Smpsmentioning

confidence: 99%

“…Additionally, nanocomposites of the Mitsubishi SMPs have been developed to serve as reinforced composites in various applications . MM3520 foams were fabricated by Abdullah et al to enhance the shape memory effect of the materials and their studies showed an increase in the shape fixity of the material at low concentrations of carbon nanotubes …”

Section: Classes Of Porous Smpsmentioning

confidence: 99%

Porous shape memory polymers: Design and applications

Hasan

Nash

Maitland

2016

J Polym Sci B Polym Phys

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Porous shape memory polymers (SMPs) exhibit geometric and volumetric shape change when actuated by an external stimulus and can be fabricated as foams, scaffolds, meshes, and other polymeric substrates that possess porous three-dimensional macrostructures. These materials have applications in multiple industries such as textiles, biomedical devices, tissue engineering, and aerospace. This review article examines recent developments in porous SMPs, with a focus on fabrication methods, methods of characterization, modes of actuation, and applications.

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“…MWCNTs possibly possessed good interaction with V-fa/ECO matrix and functioned as an additional fixed phase, improving the shape fixity of the composites [51,60]. Similar behavior was also observed in MWCNT-filled shape memory polyurethane nanocomposites [61]. The shape fixity value of MWCNT reinforced V-fa/ECO composites at 0.5 wt% MWCNTs was dropped to 91% because the excess MWCNT mass concentration could induce aggregation of the MWCNTs [62].…”

Section: Resultsmentioning

confidence: 93%

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

et al. 2019

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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.

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Determination of Shape Fixity and Shape Recovery Rate of Carbon Nanotube-filled Shape Memory Polymer Nanocomposites

Cited by 61 publications

References 13 publications

Mechanical and shape‐memory properties of poly(mannitol sebacate)/cellulose nanocrystal nanocomposites

Mechanical and shape‐memory properties of poly(mannitol sebacate)/cellulose nanocrystal nanocomposites

Porous shape memory polymers: Design and applications

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

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