3D printing of polyurethane/nanocellulose shape memory composites with tunable glass transition temperature

Zhou, Yufan; Wang, Rui; Yang, Zhijie; Hu, Xiangzhou; Pan, Yuanyuan; Lu, Yuan; Jiang, Man

doi:10.1016/j.indcrop.2022.114831

Cited by 29 publications

(15 citation statements)

References 30 publications

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“…During the solvent casting procedure, ODA-CNF can provide a solid surface for the nucleating sites to increase the crystallinity of both the SS and HS microdomains. [43,46,47,52,70,71] However, the presence of long alkyl chain on ODA-CNFs would exert adverse effect on the long-range ordering of HS. Therefore, the original crystalline endothermic (T m ) peak of HS could be sacrificed to increase the new endothermic peak at T 1 .…”

Section: Resultsmentioning

confidence: 99%

“…In this sense, HS chains dissolved in SS-rich regions can reduce the mobility of SS chains, whereas SS chains dissolved in HS-rich regions can soften HS-rich regions. [43,52] Under this circumstance, the introduction of ODA-CNF, which has a nucleating effect, can increase the degree of microphase separation and interrupt the original HS-SS interaction. [52] Consequently, the mixing effect of HS and SS on the transition temperatures can be alleviated, resulting in a decreased T g of the SS and an increased T m of the HS with ODA-CNFs.…”

Section: Resultsmentioning

confidence: 99%

“…In several studies, hydrogen bonding between nanocellulose and TPU has been the focus of investigations to discuss the thermal, dispersion, and mechanical behavior of nanocomposites. [35,[46][47][48][49][50][51][52] Beyond the mechanical reinforcement, nanocellulose-based polymer composites have been applied to a wide range of emerging fields such as shape-memory materials, [50] wearable electronics, [53] additive manufacturing, [54] energy harvesting, [55] and others. [56] In this study, we investigated the surface modification of highaspect-ratio CNFs with alkyl chains and its effect on TPU-CNF interactions.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Mechanical Reinforcement of Thermoplastic Polyurethane Nanocomposites by Surface‐Modified Nanocellulose

Kim

Huh

Yoo

2023

Macro Chemistry & Physics

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Utilization of biodegradable nanofillers is an emerging approach for the sustainable development of polymer composites. Among numerous green nanofillers, nanocellulose has garnered significant attention because of its abundance, high mechanical strength, and reinforcing capability. However, the intrinsic hydrophilicity of nanocellulose often restricts its homogeneous dispersion in the hydrophobic polymer matrix, resulting in a poor reinforcement effect. In this study, a simple surface modification of cellulose nanofibrils (CNFs) using small hydrophobic molecules is presented. Hydrophobic-modified CNFs have better solubility in organic solvents and exhibit homogeneous dispersion in a thermoplastic polyurethane (TPU) matrix. The molecular interaction between CNFs and the hard/soft segments (HS/SS) of TPU induces surface-mediated crystallization with improved microphase separation of SS and HS. By bridging multiple HS and SS microdomains, hydrophobic-modified CNFs improve the tensile modulus and ultimate tensile strength of the polymer nanocomposites. On the other hand, unmodified CNFs are strongly aggregated in the TPU matrix, which restricts the mechanical reinforcement. These results demonstrate that surface modification of nanocelluloses can engineer their dispersion state and interfacial interaction with matrix polymers, which are crucial for the mechanical reinforcement of polymer nanocomposites.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Mechanical Reinforcement of Thermoplastic Polyurethane Nanocomposites by Surface‐Modified Nanocellulose

Kim

Huh

Yoo

2023

Macro Chemistry & Physics

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“…Due to its outstanding properties such as high specific surface area and superior mechanical properties, 8 NC was employed in many studies conducted toward the development of green or sustainable nanocomposite materials. Up to now, NC has been used in composite formulations based on different polymers including poly(vinyl alcohol) (PVA), 9 polyurethane, 10 epoxy resin, 11 poly(lactic acid), 12 polyethylene, 13 and polypropylene. 14 Nevertheless, NC-based nanomaterials possess specific shortcomings; the main drawbacks come from the incompatibility of the hydrophilic filler with the hydrophobic polymers, which will consequently lead to difficulties in terms of dispersion 15,16 A very important issue that needs to be considered when developing nanocomposites is the interfacial interaction of the continuous polymeric phase and the nanofiller and also the compatibility of the components.…”

Section: ■ Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Tailoring an Effective Interface between Nanocellulose and the Epoxidized Linseed Oil Network through Functionalization

et al. 2023

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Sustainable nanocomposite materials based on different functionalized nanocellulose (NC) structures embedded in epoxidized linseed oil (ELO) were developed as foundation toward a greener approach for anticorrosive coating evolution. The work leans on functionalization with (3-aminopropyl) triethoxysilane (APTS), (3-glycidyloxypropyl)trimethoxysilane (GPTS), and vanillin (V) of NC structures isolated from plum seed shells, evaluated as potential reinforcing agents for the increase of thermomechanical properties and water resistance of epoxy nanocomposites from renewable resources. The successful surface modification was confirmed from the deconvolution of X-ray photoelectron spectra for C 1s and correlated with Fourier transform infrared (FTIR) data. The secondary peaks assigned to C−O−Si at 285.9 eV and C−N at 286 eV were observed with the decrease of the C/O atomic ratio. Compatibility and efficient interface formation between the functionalized NC and the biobased epoxy network from linseed oil were translated as decreased values for the surface energy of bio-nanocomposites and better dispersion imaged through scanning electron microscopy (SEM). Thus, the storage modulus of the ELO network reinforced with only 1% APTS-functionalized NC structures reached 5 GPa, an almost 20% increase compared with that of the neat matrix. Mechanical tests were applied to assess an increase of 116% in compressive strength for the addition of 5 wt % NCA to the bioepoxy matrix.

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Multifunctional properties optimization and stimuli‐responsivity of shape memory polymeric nanoarchitectures and applications

Idumah

2023

Polymer Engineering & Sci

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As a result of nanotechnological advancement, parameters inducing flaws in shape memory polymers (SMP), such as weak mechanical properties, low electrical, and thermal conductivities, and so on, were mitigated through the inclusion of a versatile range of nanomaterials such as montmorillonites, carbon nanotubes, graphene and derivatives, cellulose nanocrystals, carbon nanofibers, and so on, thereby forming shape memory polymeric nanoarchitectures (SMPNs). Hence, this work elucidates most recently emerging advancements on multifunctional SMPNs filled by differing nanoparticulates. Varying multifunctional SMPNs exhibit responsivity to varying forms of stimulation strategies, including thermal responsivity, electroactivated, alternating magnetic field responsivity, light sensitivity, and water induced SMPs. Therefore, this article presents very recently emerging advancements in the construction, characterization, properties, and multifunctional applications of stimuliresponsive SMPNs, with special emphasis on functional and stimuli-responsive SMPNs. Furthermore, important functions of SMPNs such as stimuli-memory effect and self-mending abilities, as well as prospective strategies for future progress of these materials are highlighted.

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3D printing of polyurethane/nanocellulose shape memory composites with tunable glass transition temperature

Cited by 29 publications

References 30 publications

Mechanical Reinforcement of Thermoplastic Polyurethane Nanocomposites by Surface‐Modified Nanocellulose

Mechanical Reinforcement of Thermoplastic Polyurethane Nanocomposites by Surface‐Modified Nanocellulose

Tailoring an Effective Interface between Nanocellulose and the Epoxidized Linseed Oil Network through Functionalization

Multifunctional properties optimization and stimuli‐responsivity of shape memory polymeric nanoarchitectures and applications

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