Hierarchy of relaxation times in supramolecular polymer model networks

Koziol, Martha; Nguyen, Phuong L. N.; Gallo, Shannon; Olsen, Bradley D.; Seiffert, Sebastian

doi:10.1039/d1cp04213k

Cited by 6 publications

(3 citation statements)

References 42 publications

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“…54 Another possibility to overcome the ill-posedness of eqns (4)-( 6) is to set H() to be of a meaningful functional form, such as a Gaussian distribution or a log-normal distribution. 55,56 The distribution parameters, such as mean relaxation time or standard deviation can then be determined by nonlinear curve-fitting of eqns (4)-( 6). However, this method is only useful in cases, where the expected functional form of H() is already known.…”

Section: The Generalized Maxwell Modelmentioning

confidence: 99%

Comparison of Classical and Fractional Viscoelastic Models for Describing Entangled Polymer Solutions

Schmidt,

Winter,

Gradzielski

2024

Preprint

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Fractional viscoelastic models provide an excellent description of rheological data for polymer systems with power-law behavior. However, the physical interpretation of their model parameters, which carry fractional units of time, remains elusive. We show that for poly(ethylene oxide) (PEO) solutions, the fractional Maxwell model (FMM) requires fewer model elements than classical spring-dashpot models for a reasonable description of the data and that it can be applied consistently to solutions with varying degrees of viscoelasticity. The fractional parameters exhibit scaling laws similar to classical parameters as a function of polymer concentration. To attach physical meaning to the fractional parameters, we derive an analytical expression for the relaxation time spectrum associated with the FMM and find it to be equivalent to the empirical dual asymptote model.

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Section: The Generalized Maxwell Modelmentioning

confidence: 99%

Comparison of Classical and Fractional Viscoelastic Models for Describing Entangled Polymer Solutions

Schmidt,

Winter,

Gradzielski

2024

Preprint

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“…Adjustments in the ratio of these components and polymer chain lengths, along with the addition of multiple additives and fillers, are necessary for tailoring the mechanical integrity and elasticity of silicone elastomers. This enables their adaptation to a wide range of applications [19], [20]. The functionalization of silicone materials, through the incorporation of novel cross-linkers and chemical modifications, such as co-hydrosilylation, significantly boosts their thermal and dielectric performance, making them suitable for advanced electronic and biomaterial applications.…”

Section: Introductionmentioning

confidence: 99%

Unveiling design criteria of hollow fibers dielectric elastomer actuators: a computational and experimental study

Jafarzadeh,

Gokova,

Kang

et al. 2024

Electroactive Polymer Actuators and Devices (EAPAD) XXVI

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Dielectric elastomer actuators (DEAs) have been proclaimed as a transformative technology with applications spanning from robotics to biomedical devices. They are especially appealing because of their key characteristics, including low weight and lifetime. However, there are still challenges in tuning these actuators for desirable mechanical performance. Here, we examine the effects of geometry and material characteristics like inner diameter and Young's modulus on the performance of hollow fiber dielectric elastomer actuators (HFDEAs). These parameters were chosen because they are amenable to experimental validation and play a straightforward, yet significant, role in DEA performance. The model's parameters are based on experimental data, giving our computational simulations a solid foundation. The study takes into consideration the electro-mechanical coupling using finite element method (FEM) simulations in COMSOL Multiphysics. While the electrodes' attraction to one another results in length expansion, the results suggest that the larger surface charge density on the internal electrode compared to the inner one in hollow fiber DEAs results in radial expansion as well. This model also provides an estimation on the actuator holding force which is challenging to evaluate experimentally. According to preliminary results, careful parameter selection can indeed increase the holding force, thereby enhancing the actuator's overall effectiveness. In conclusion, this study provides an understanding of design parameters of HFDEA offering a comprehensive framework for HFDEA design by integrating both experimental and computational approaches.

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“…At last, when combing self-healing, adhesivity, transparency, stretchability, and other mechanical properties of gels into the information storage system, the information process ability may be further enhanced. In previous works, we and others have reported a series of terpyridine-based organogels, metallogels, and hydrogels, which exhibit extended applications in various fields, such as optics, sensing platforms, catalysis, phase separation absorption of VOC, stimuli-responsive materials, and so on. − However, the practical application of terpyridine-based gels in information security is seldom studied. Meanwhile, the practical application of a low-molecular-weight gel is restricted because of the gel fragility, which can be improved through the introduction of a polymeric network usually with excellent mechanical properties. , By combining the dual base and acid responsiveness of the functionalized terpyridine derivative with mechanical properties of a polymer gel, the resulted terpyridine-based gels will provide a facile and programmable approach to adjust fluorescence in order to enhance information security, anticounterfeiting, and processing capabilities.…”

Section: Introductionmentioning

confidence: 99%

Dual Lewis Acid- and Base-Responsive Terpyridine-Based Hydrogel: Programmable and Spatiotemporal Regulation of Fluorescence for Chemical-Based Information Security

Chen

Pang

et al. 2023

Inorg. Chem.

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A huge amount of data inundated in our daily life; there is an ever-increasing need to develop a new strategy of information encryption–decryption–erasing. Herein, a polymeric DCTpy/PAM hydrogel has been fabricated to store information via controllable Eu3+/Zn2+ ionoprinting for hierarchical and multidimensional information decryption. Eu3+ and Zn2+ have a competition and dynamic interaction toward DCTpy under NH3 stimuli in the polymeric DCTpy/PAM hydrogel network. The Eu(III)/Zn(II)@DCTpy/PAM hydrogel exhibits light red fluorescence of Eu3+ due to the antenna effect. Upon the addition of NH3, dissociation of the Eu3+–DCTpy complex takes place, and the Zn(II)/DCTpy/NH3 complex is formed with both ICT (intramolecular charge-transfer) and PET (photo-induced electron-transfer) process characteristics that exhibits yellow emission color. Subsequently, HCl can quench the fluorescence of the resulting hydrogel. By integrating transparency, adhesiveness, and programmable stimuli responsiveness of the hydrogel blocks in to one system, complex, multistage, and time-controlled information storage–encryption–decryption–erasing in sequence with multidimensions is illustrated via the molecule diffusion method. This work provides a novel and representative strategy in fabricating information encryption–decryption-erasing materials with high capacity and complexity by a simple terpyridine-based hydrogel.

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Hierarchy of relaxation times in supramolecular polymer model networks

Abstract: Supramolecular polymer gels are an evolving class of soft materials with a vast number of properties that can be tuned to desired applications. Despite continous advances concerning polymer synthesis, sustainability...

Cited by 6 publications

References 42 publications

Comparison of Classical and Fractional Viscoelastic Models for Describing Entangled Polymer Solutions

Comparison of Classical and Fractional Viscoelastic Models for Describing Entangled Polymer Solutions

Unveiling design criteria of hollow fibers dielectric elastomer actuators: a computational and experimental study

Dual Lewis Acid- and Base-Responsive Terpyridine-Based Hydrogel: Programmable and Spatiotemporal Regulation of Fluorescence for Chemical-Based Information Security

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