Mechanics of innovative responsive polymers

Brighenti, Roberto; Artoni, Federico; Cosma, Mattia Pancrazio

doi:10.1016/j.mechrescom.2019.103403

Cited by 5 publications

(2 citation statements)

References 36 publications

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“…Mechanophore-containing polymers have been recently studied from the mechanics viewpoint in order to provide a quantitative description of their response to external stimuli (Silberstein et al, 2013(Silberstein et al, , 2014Wang et al, 2015;Takaffoli et al, 2016). In general, when dealing with a system characterized by two different stable configurational states, namely s 1 and s 2 , the dynamic equilibrium quantifying how much the equilibrium of the system is closer to the state s 1 or to the state s 2 is provided by a differential equation of the form (Brighenti et al, 2018(Brighenti et al, , 2019…”

Section: Modeling Aspectsmentioning

confidence: 99%

Smart Polymers for Advanced Applications: A Mechanical Perspective Review

2020

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Responsive materials, as well as active structural systems, are today widely used to develop unprecedented smart devices, sensors, or actuators; their functionalities come from the ability to respond to environmental stimuli with a detectable reaction. Depending on the responsive material under study, the triggering stimuli can have a different nature, ranging from physical (temperature, light, electric or magnetic field, mechanical stress, etc.), chemical (pH, ligands, etc.), or biological (enzymes, etc.) type. Such a responsiveness can be obtained by properly designing the meso-or macroscopic arrangement of the constitutive elements, as occurs in metamaterials, or can be obtained by using responsive materials per se, whose responsiveness comes from the chemistry underlying their microstructure. In fact, when the responsiveness at the molecular level is properly organized, the nanoscale response can be collectively detected at the macroscale, leading to a responsive material. In the present article, we review the enormous world of responsive polymers, by outlining the main features, characteristics, and responsive mechanisms of smart polymers and by providing a mechanical modeling perspective, both at the molecular as well as at the continuum scale level. We aim at providing a comprehensive overview of the main features and modeling aspects of the most diffused smart polymers. The quantitative mechanical description of active materials plays a key role in their development and use, enabling the design of advanced devices as well as to engineer the materials' microstructure according to the desired functionality.

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Section: Modeling Aspectsmentioning

confidence: 99%

Smart Polymers for Advanced Applications: A Mechanical Perspective Review

2020

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“…The importance of smart materials is increasing daily due to their multiple uses in the medical and biological fields. , Smart materials, also known as stimuli-responsive materials, are physicochemical-sensitive materials that can change their behavior according to the surrounding environment. − Scientists classified such materials according to their acting stimuli, such as temperature, pH, solvent, mechanical, ionic strength, magnetic, and light. − Moreover, researchers combined multiple stimuli for the fabrication of di- and triresponsive polymeric materials. − Poly N -isopropylacrylamide (PNIPAAm) is the most popular material among the thermoresponsive (TR) group. It possesses both hydrophilic and hydrophobic groups, which result in phase separation of the polymer solution by raising its temperature above a lower critical solution temperature (LCST) (32 °C) due to a change from a hydration (hydrophilic) to dehydration (hydrophobic) state.…”

Section: Introductionmentioning

confidence: 99%

Thermo-pH-Salt Environmental Terpolymers Influenced by 2-((Dimethylamino)methyl)-4-methylphenyl Acrylate: A Comparative Study for Tuning Phase Separation Temperature

Abdelaty,

Abu-Zahra

2023

ACS Omega

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This study offers a comparison between three different types of thermoresponsive (TR) and thermo-pH-salt (TPR) multiresponsive polymers including homopoly(N-isopropylacrylamide) (PNIPAAm), copolymers with three different monomers, 2-hydroxyethyl methacrylate (HEMA), N,N-dimethylacrylamide (DMAAm), and styrene (S) at three different concentrations (5, 10, and 20 mol %), and a PNIPAAm terpolymer with 5, 10, and 20 mol % 2-((dimethylamino)methyl)-4-methylphenyl acrylate (DMAMCA) and 10 mol % HEMA, DMAAm, and S monomers. All polymers were chemically analyzed with 1H NMR and Fourier transform infrared spectroscopy (FT-IR) as well as gel permeation chromatography (GPC) for the molecular weights and dispersity and differential scanning calorimeter (DSC) for the glass transition temperatures. The cloud point, also known as the phase separation temperature (C p), was determined for all polymers by a turbidity test using a UV–vis spectrophotometer; a micro-differential scanning calorimeter was used for measuring the cloud point in deionized water. The influence of a tertiary amine cationic group of DMAMCA changed the behavior of TR copolymers into TPR by shifting the cloud point of the TPR to higher values in acidic solutions (lower pH) and to lower values in alkaline solutions. The C p was measured at different concentrations of Hofmeister kosmotropic and chaotropic anion salt solutions in a range of pH solutions for the terpolymers. It demonstrated the same behavior as mentioned in pH solutions besides the effect of salt ions. By measuring the T c and C p of these polymers, we can exploit various applications of stimuli-responsive materials for sensors and biomedical technology.

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Comprehensive study of the phase transition temperature of poly (NIPAAm-co-DEAMCA-co-VA) terpolymers, post-serine and valine: thermal/pH and Hofmeister anions

Abdelaty

2022

Polym. Bull.

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Mechanics of innovative responsive polymers

Cited by 5 publications

References 36 publications

Smart Polymers for Advanced Applications: A Mechanical Perspective Review

Smart Polymers for Advanced Applications: A Mechanical Perspective Review

Thermo-pH-Salt Environmental Terpolymers Influenced by 2-((Dimethylamino)methyl)-4-methylphenyl Acrylate: A Comparative Study for Tuning Phase Separation Temperature

Comprehensive study of the phase transition temperature of poly (NIPAAm-co-DEAMCA-co-VA) terpolymers, post-serine and valine: thermal/pH and Hofmeister anions

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