The effect of controlled phase separation of PEG/PCL-2000 homopolymer polyols using their PCL500-PEG1000-PCL500 tri-block copolymer and CNCs in the final polyurethane hydrogels on their shape memory behavior

Jafari, Safora; Nourany, Mohammad; Zakizadeh, Mehrad; Taghilou, Arefe; Ranjbar, Hanieh Aghaiee; Noormohammadi, Fatemeh

doi:10.1016/j.coco.2020.03.016

Cited by 33 publications

(49 citation statements)

References 8 publications

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“…[ 181 ] Hybrid gels of CNC with poly(caprolactone)‐ block ‐poly(ethylene glycol)‐ block ‐poly(caprolactone) were used in cell culturing applications. [ 303 ] Next we will focus on selected recent examples on nanocellulose based scaffolds.…”

Section: Nanocellulose‐based Hybrid and Functional Hydrogelsmentioning

confidence: 99%

Nanocellulose: Recent Fundamental Advances and Emerging Biological and Biomimicking Applications

et al. 2020

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In the effort toward sustainable advanced functional materials, nanocelluloses have attracted extensive recent attention. Nanocelluloses range from rod‐like highly crystalline cellulose nanocrystals to longer and more entangled cellulose nanofibers, earlier denoted also as microfibrillated celluloses and bacterial cellulose. In recent years, they have spurred research toward a wide range of applications, ranging from nanocomposites, viscosity modifiers, films, barrier layers, fibers, structural color, gels, aerogels and foams, and energy applications, until filtering membranes, to name a few. Still, nanocelluloses continue to show surprisingly high challenges to master their interactions and tailorability to allow well‐controlled assemblies for functional materials. Rather than trying to review the already extensive nanocellulose literature at large, here selected aspects of the recent progress are the focus. Water interactions, which are central for processing for the functional properties, are discussed first. Then advanced hybrid gels toward (multi)stimuli responses, shape‐memory materials, self‐healing, adhesion and gluing, biological scaffolding, and forensic applications are discussed. Finally, composite fibers are discussed, as well as nanocellulose as a strategy for improvement of photosynthesis‐based chemicals production. In summary, selected perspectives toward new directions for sustainable high‐tech functional materials science based on nanocelluloses are described.

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Section: Nanocellulose‐based Hybrid and Functional Hydrogelsmentioning

confidence: 99%

Nanocellulose: Recent Fundamental Advances and Emerging Biological and Biomimicking Applications

et al. 2020

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“…Based onFigure 5A, presence of an increment in the temperature range of −32 C and −7 C for CNC (0.25%, 0.50%, and 1.0%) samples is a sign of cold crystallization, which occurs in the heating regime for chains with limited dynamic 29,30. The CNC(x) samples show a relatively sharp fall in storage modulus at Tg transition, showing a limited crystallization thermodynamics due to increased disorder and chemical confinement through urethane linkage 14,24. Based onFigure 5C, it can be seen that the Tg transitions have broadened indicating increased chain dynamics and crystallization by increasing PCL grafts' content.…”

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confidence: 94%

“…The effect of the change in crystallization of the polyol chains and the change in the size of the hard domains on shape memory performance of the PUs was studied in detail. 14 There was little information about phase separation of PEG/PCL soft segments. 15 Phua et al reported preparation of nanocomposite of a polyether-based thermoplastic PU with polydopamine-modified clay.…”

Section: Introductionmentioning

confidence: 99%

“…Jafari et al evaluated the effect of PCL 500 ‐PEG 1000 ‐PCL 500 block copolymer content on controlling phase and crystallization behavior of the PEG/PCL‐2000 homopolyol blend and the results indicated an intense change in crystallization ability of the semi‐crystalline chains. The effect of the change in crystallization of the polyol chains and the change in the size of the hard domains on shape memory performance of the PUs was studied in detail 14 . Liu et al reported synthesis of a multi‐stimulus PU nanocomposite based on PEG/PCL‐4000 and CNC reacted through methylene diphenyl diisocyanate (MDI) with a relative change in PEG and PCL content.…”

Section: Introductionmentioning

confidence: 99%

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Stimuli‐responsive polyurethane bionanocomposites of poly(ethylene glycol)/poly(ε‐caprolactone) and [poly(ε‐caprolactone)‐grafted‐] cellulose nanocrystals

Ranjbar

Nourany

Mollavali³

et al. 2020

Polymers for Advanced Techs

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In this study, in situ polyurethane (PU) bionanocomposites of poly(ethylene glycol) (PEG)/poly(ε-caprolactone) (PCL) polyols, bare cellulose nanocrystals (CNCs) and PCLgrafted CNCs (G-CNC) were synthesized with different contents of CNCs as crosslinking agent to control the extent of phase separation. The effect of confining the chains between CNCs through urethane linkages and presence of PCL grafts on phase and crystallization behavior was evaluated. Crystallization and chemical networking were controlled to tune the shape fixity (SF) and recovery (SR) of the specimens, resulting in a SF of 100% for linear and PU nanocomposites of G-CNC (0.5% and 1%) samples. The PU nanocomposite of G-CNC (0.5%) was selected as the optimum sample with the highest SR of 100%. The effect of surface hydrophobicity on cellular behavior of Human Foreskin Fibroblast (as a normal cell) and HepG2 (as a cancerous cell) cells was evaluated. Cell adhesion analysis of the prepared samples indicated two different behaviors possibly due to the difference in the epigenetic nature of the cells and cellular integrin-based bonds showing a great potential for a variety of tissue engineering applications.

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“…The shape-memory polymers (SMPs) have the advantages of low density, excellent shape-recovery capacity, electrical insulation, easy processability, and low cost. [1][2][3][4][5] Thus, SMPs are widely used in electronics, aircraft, and aerospace fields, such as in actuators and self-deployable space structures. [6][7][8][9][10] An SMP shifts between rigid and elastic states through thermal stimuli at the critical temperature (T c ).…”

Section: Introductionmentioning

confidence: 99%

Deployment Analysis of Aramid Fiber Reinforced Shape-Memory Epoxy Resin Composites

Jing¹,

Wei²,

Liu³

et al. 2020

Eng. Sci.

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This work aims to study the shape recovery of aramid fiber-reinforced shape-memory epoxy resin composite (SMERs). A circular tube can be assumed to be composed of a pair of curved tape with the same radius before being folded, and the middle position of this tubular structures is folded with a small curvature. The cylindrical shell is deformed into a flat shape at the folding line. So the shape memory fold-deploy experiments of the three deployable structures, flat tape, curved tape, and circular tube prepared with SMERs, were performed respectively, and the shape memory deployable processes were also simulated with finite element model. The temperature dependences of deployment angle, axial stress and axial strain in the shape memory folding step, cooling step, constraint removal step and reheating step were analyzed. The results showed that the full deployable process of each deployable structure was simulated well compared with experimental results. The strength failure in structure component occurred during the fold-deploy shape memory process. The long-term shear modulus of viscoelastic materials had a great influence on shape memory performance.

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The effect of controlled phase separation of PEG/PCL-2000 homopolymer polyols using their PCL500-PEG1000-PCL500 tri-block copolymer and CNCs in the final polyurethane hydrogels on their shape memory behavior

Cited by 33 publications

References 8 publications

Nanocellulose: Recent Fundamental Advances and Emerging Biological and Biomimicking Applications

Nanocellulose: Recent Fundamental Advances and Emerging Biological and Biomimicking Applications

Stimuli‐responsive polyurethane bionanocomposites of poly(ethylene glycol)/poly(ε‐caprolactone) and [poly(ε‐caprolactone)‐grafted‐] cellulose nanocrystals

Deployment Analysis of Aramid Fiber Reinforced Shape-Memory Epoxy Resin Composites

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