A “trampoline” nanocomposite: Tuning the interlayer spacing in graphene oxide/polyurethane to achieve coalesced mechanical and memory properties

Zhang, Yuanchi; Hu, Jinlian; Zhu, Song; Qin, Tingwu; Jiang, Feng

doi:10.1016/j.compscitech.2019.04.033

Cited by 16 publications

(20 citation statements)

References 56 publications

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“…Figure 3C is the SEM images of various fibers. Pristine PU showed a rough surface that being consistent with previous references [25]. By comparison, white particles could be found in the surface of the PU/TN fiber.…”

Section: Structures and Morphologies Of Pu And Its Nanocomposites Fiberssupporting

confidence: 90%

“…Previously, our group found that mineral nanoparticles like hydroxyapatite in the physical blending PU composites could have an aggregation to decrease the modulus of the composite [22]. Good news is the negative effects could be improved through forming a stable molecular construction and we found graphene oxide (GO) is an effective tool to consolidate the PU composite [22,25]. It is well known that graphene composed of sp 2 -bonded carbon atoms has excellent mechanical, optical, conductive properties and good biocompatibility due to its special structure [26,27].…”

Section: Introductionmentioning

confidence: 94%

“…Compared with neat PU, Tg of PU/TN decreased to 63 °C. Based on published reports, Tg could represent the mobility of the soft segment (polymer chains) in the matrix [25,36]. In this case, after adding TN, dispersed nanoparticles might reduce molecular interaction among polymer chains leading to an increase of mobility.…”

Section: Thermal and Mechanical Properties Of Pu And Its Nanocomposites Fibersmentioning

confidence: 99%

“…In this case, after adding TN, dispersed nanoparticles might reduce molecular interaction among polymer chains leading to an increase of mobility. In addition, after introducing GO, T g was further decreased to 57 • C. According to the literature, GO based PU composite could form an intercalated structure [25]. Besides, TN could weaken the electrostatic repulsion between GO sheets due to its electrostatic field effect [30].…”

Section: Thermal and Mechanical Properties Of Pu And Its Nanocomposites Fibersmentioning

confidence: 99%

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Robust Effects of Graphene Oxide on Polyurethane/Tourmaline Nanocomposite Fiber

Zhang

2020

Polymers

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The use of energy therapy including tourmaline/negative ions has gained huge popularity due to their long-standing historical evidence in improving human health and the technology development. However, the limitations of tourmaline based polyurethane fibers including the unsatisfied mechanical properties and negative ions releasing performances hind their further applications for wearable energy therapy. In this study, graphene oxide was modified within the polyurethane/tourmaline nanocomposite and then the wet-spinning method was used to prepare the fibers. As expected, the results proved that polyurethane/tourmaline/graphene oxide fiber had enhanced Young’s modulus (8.4 MPa) and tensile stain at break (335%). In addition, the number of released negative ions from polyurethane/tourmaline/graphene oxide fiber was significantly improved 17 times and 1.6 times more than that of neat polyurethane fiber and polyurethane/tourmaline fiber, respectively. Moreover, the releasing number of negative ions was significantly decreased after being applying voltage. We envision that the proposed polyurethane/tourmaline/graphene oxide fiber will provide valuable insights into the development of the wearable energy products.

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Section: Structures and Morphologies Of Pu And Its Nanocomposites Fiberssupporting

confidence: 90%

Section: Introductionmentioning

confidence: 94%

Section: Thermal and Mechanical Properties Of Pu And Its Nanocomposites Fibersmentioning

confidence: 99%

Section: Thermal and Mechanical Properties Of Pu And Its Nanocomposites Fibersmentioning

confidence: 99%

See 2 more Smart Citations

Robust Effects of Graphene Oxide on Polyurethane/Tourmaline Nanocomposite Fiber

Zhang

2020

Polymers

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“…We assumed that the device made of SMP/iGO was implanted into the defected bone at a compressed size, and we investigated the recovery stress at the interface when the temperature was 40 • C. The device-bone system was simplified to a cylinder-cube (materials and bone, respectively) model in this case, where all materials were regarded to be isotropic, homogeneous, and linearly elastic. According to the literature, the properties of the cylinder (materials) and the cube (bone) were set respectively as follows-Young's modulus: 339 MPa/1.5 GPa, Poisson's ratio: 0.25/0.3, CTE: 0.13511/0 [29,30].…”

Section: Finite Element Analysismentioning

confidence: 99%

Isocyanate Modified GO Shape-Memory Polyurethane Composite

Zhang

2020

Polymers

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Shape-memory composites have benefits for minimally invasive surgery, but their wider applications for bone repair are hindered by conflicts between the mechanical and memory performances, especially at load-bearing locations. In this study, we fabricated a graphene oxide shape-memory polyurethane composite through the chemical combination of graphene oxide and isocyanate, in order to realize satisfactory mechanical and shape-memory effects. As desired, a modulus of ~339 MPa and a shape recovery ratio of 98% were achieved, respectively, in the composite. In addition, finite element analysis demonstrated that, after being implanted in a defective bone through a minimally invasive treatment, where the highest stress was distributed at the implant–bone interface, this composite could offer a generated force during the recovery process. Furthermore, we also discuss the origins of the improved mechanical and memory properties of the composites, which arise from increased net-points and the stable molecular structure inside. Therefore, with its superior structure and properties, we envision that this shape-memory composite can provide new insights toward the practical application of shape-memory polymers and composites in the field of bone repair.

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Design and development of graphene oxide/shape memory nanocomposite based on hexamethylene diisocyanate mixing segment

Mohanty,

Garg,

Gupta

et al. 2024

J of Applied Polymer Sci

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Shape memory polymers are remarkable materials renowned for their distinctive ability to fix and recover their original shape in response to specific stimuli. However, the lower shape fixity (SF) of conventional thermally triggered shape memory polyurethane (SMPU) has limited its broad application potential. This study investigates the transformative influence of graphene oxide (GO) nanofillers when incorporated into a linear diisocyanate‐based mixing segment SMPU (SMPU‐GO). The lower SF issue of SMPU is ingeniously addressed by leveraging the interactive properties of GO with the 4,4′‐methylene bis‐phenyl diisocyanate hard segment and the introduction of additional physical cross‐links via hexamethylene diisocyanate mixing segment. At 1 wt.% GO incorporation, the modulus increased by 178%, an 8% increase in tensile strength, while the elasticity was maintained. Excellent improvement in SF and shape recovery (SR) was attained at 1 wt.% GO incorporated SMPU, and the SMPU nanocomposite showed the highest SF (65%) and SR (100%) at 70°C temperature and 50% strain.

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A “trampoline” nanocomposite: Tuning the interlayer spacing in graphene oxide/polyurethane to achieve coalesced mechanical and memory properties

Cited by 16 publications

References 56 publications

Robust Effects of Graphene Oxide on Polyurethane/Tourmaline Nanocomposite Fiber

Robust Effects of Graphene Oxide on Polyurethane/Tourmaline Nanocomposite Fiber

Isocyanate Modified GO Shape-Memory Polyurethane Composite

Design and development of graphene oxide/shape memory nanocomposite based on hexamethylene diisocyanate mixing segment

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