Assessing the Influence of Temperature‐Memory Creation on the Degradation of Copolyesterurethanes in Ultrathin Films

Machatschek, Rainhard; Saretia, Shivam; Lendlein, Andreas

doi:10.1002/admi.202001926

Cited by 5 publications

(6 citation statements)

References 28 publications

(53 reference statements)

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“…[1,2] The properties of interfaces can be knowledge of the interfacial viscoelasticity is beneficial for diverse formulations concerning emulsification, wetting and dewetting behavior, foaming, high-speed coating, etc. [22][23][24] There are two general techniques to measure the viscoelastic properties of interfaces. In interfacial dilatational rheology, the area is increased or decreased resulting in a stress applied to the interface.…”

Section: Introductionmentioning

confidence: 99%

Interfacial Rearrangements of Block Copolymer Micelles Toward Gelled Liquid–Liquid Interfaces with Adjustable Viscoelasticity

Prasser

Steinbach

Münch

et al. 2022

Small

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modified by several types of additives such as low molecular weight surfactants and proteins, [3][4][5] particles, [6][7][8][9] or polymers. [10][11][12][13][14][15][16] Hereby, the adsorption of surface-active entities can occur by adsorption of unimers to form eventually more or less homogeneous monolayers. However, amphiphiles are often present in colloidal form as micelles. Since other colloidal particles, e.g., nanoparticles and microgels, can adsorb to interfaces in a pickeringlike fashion, intact micelles might also be prone to adsorb to the interface. [10,17,18] However, little is known on the fate of such interfacially attached micelles. In most cases, the kinetics of the rearrangements toward a monolayer are hard to capture.Generally, the interfacial tension is regarded as a primary indicator of adsorption processes, often deemed sufficient to trace changes at liquid interfaces. However, the involvement of certain substances or combinations can lead to complex interfaces with additional rheological properties, completely different to the ones of the pure interface. [1,19,20] Examples could involve, e.g., interfacial polymerization [21] (including classical nylon thread fabrication) or even interfacial crosslinking (bubble tea preparation). In some of these cases, the interfacial film is rather thick. However, also monolayers of amphiphiles can exhibit viscoelastic properties being essential for the properties of the whole system. Hence, Though amphiphiles are ubiquitously used for altering interfaces, interfacial reorganization processes are in many cases obscure. For example, adsorption of micelles to liquid-liquid interfaces is often accompanied by rapid reorganizations toward monolayers. Then, the involved time scales are too short to be followed accurately. A block copolymer system, which comprises poly(ethylene oxide) 110 -b-poly{[2-(methacryloyloxy)ethyl]diisopropylmethylammonium chloride} 170 (i.e., PEO 110 -b-qPDPAEMA 170 with quaternized poly(diisopropylaminoethyl methacrylate)) is presented. Its reorganization kinetics at the water/n-decane interface is slowed down by electrostatic interactions with ferricyanide ([Fe(CN) 6 ] 3-). This deceleration allows an observation of the restructuring of the adsorbed micelles not only by tracing the interfacial pressure, but also by analyzing the interfacial rheology and structure with help of atomic force microscopy. The observed micellar flattening and subsequent merging toward a physically interconnected monolayer lead to a viscoelastic interface well detectable by interfacial shear rheology (ISR). Furthermore, the "gelled" interface is redox-active, enabling a return to purely viscous interfaces and hence a manipulation of the rheological properties by redox reactions. Additionally, interfacial Prussian blue formation stiffens the interface. Such manipulation and in-depth knowledge of the rheology of complex interfaces can be beneficial for the development of emulsion formulations in industry or medicine, where colloidal stability or adapted permeabil...

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Section: Introductionmentioning

confidence: 99%

Interfacial Rearrangements of Block Copolymer Micelles Toward Gelled Liquid–Liquid Interfaces with Adjustable Viscoelasticity

Prasser

Steinbach

Münch

et al. 2022

Small

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“…The crystalline structures in Langmuir film based on shape‐memory PDLCL copolymers can be confirmed by XRR, and the thickness of the film can be determined between 1.5 and 3 nm. [ 86 ]…”

Section: Optical/spectroscopic Techniques For Characterization Of Smpsmentioning

confidence: 99%

Light and Shape‐Memory Polymers: Characterization, Preparation, Stimulation, and Application

Fang,

Yan,

Chen

et al. 2023

Macro Materials & Eng

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Shape‐memory polymers (SMPs) are smart materials that change shape when exposed to stimuli and have various applications in different fields due to their unique properties. Light, as a kind of electromagnetic radiation, plays an important role in understanding the structure‐property relations of SMPs, preparing original shapes, using them as non‐contact stimuli sources, and tuning the optical properties of SMPs. This review provides a comprehensive review of the involvement of light in structure‐preparation‐stimuli‐application of SMPs. The review is divided into four sections. First, applications of optical/spectroscopic approaches that provide information for understanding structure‐property relations in SMPs, especially during programming and recovery. Second, describes how to build SMPs with light, including different photochemical reactions and 3D photocuring technologies. Third, discusses how light is used to trigger the shape change of SMPs through both photochemical and photothermal mechanisms. Last, focuses on how to take advantage of the shape‐memory effect to tune the optical characteristics of polymers, including various structures of SMP color‐changing materials and their synthetic strategies. Future research could focus on developing efficient photothermal fillers, new 3D printing techniques for SMPs, exploring their use in biomedical and wearable devices, and optimizing SMPs for industrial applications.

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“…93,106,[120][121][122] To achieve an SME instead, oligo(-caprolactone) (OCL) segments were added to methacrylate-based networks. 123 Designing SMPs for biological applications is made possible by the soft PCL blocks' biodegradability. 124…”

Section: Melting Transition-based Shape Memory Polymersmentioning

confidence: 99%

Recent trends in thermo‐responsive elastomeric shape memory polymer nanocomposites

et al. 2023

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Shape memory polymers (SMPs) are polymeric smart materials, a class of stimuli‐responsive polymers that can return to their initial shape from a programmed temporary shape under the application of external stimuli, such as light, heat, magnetism, and electricity. Because of these unique features, SMPs can find applications in many fields, like aerospace, biomedical devices, flexible electronics, soft robotics, shape memory arrays, and 4D printing. The comparatively low density, low cost, easy biodegradability, and biocompatibility make SMPs a better candidate for shape memory applications. Among them, thermo‐responsive SMPs can revert to their permanent shape depending on a temperature greater than their polymer transition temperature. Thermo‐responsive SMPs combine semi‐crystalline or elastomeric polymers with improved mechanical and electrical properties. Integrating nanofillers into the polymer elastomer matrices can further enhance these properties, forming shape‐memory polymer nanocomposites (SMPNCs). This review focuses on the basics, design, and classifications of thermo‐responsive SMPs and the characteristics of elastomers and blends of polymers used. Incorporating various nanofillers to get SMPNCs to have improved properties over SMPs is also presented. The importance of Tg (glass transition temperature) and Tm (melting temperature) based SMPs and SMPNCs, various elastomers used, and the methods for preparation like solution casting, melt compounding, in situ polymerization, and their possible future applications are also discussed.

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Assessing the Influence of Temperature‐Memory Creation on the Degradation of Copolyesterurethanes in Ultrathin Films

Cited by 5 publications

References 28 publications

Interfacial Rearrangements of Block Copolymer Micelles Toward Gelled Liquid–Liquid Interfaces with Adjustable Viscoelasticity

Interfacial Rearrangements of Block Copolymer Micelles Toward Gelled Liquid–Liquid Interfaces with Adjustable Viscoelasticity

Light and Shape‐Memory Polymers: Characterization, Preparation, Stimulation, and Application

Recent trends in thermo‐responsive elastomeric shape memory polymer nanocomposites

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