Improving autonomous self healing via combined chemical/physical principles

Michael, Philipp; Döhler, Diana; Binder, Wolfgang H.

doi:10.1016/j.polymer.2015.01.041

Cited by 58 publications

(23 citation statements)

References 130 publications

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“…Those crosslinks can be achieved either physically or chemically, while the chemical crosslinks are covalent and therefore usually irreversible. 35 On the other hand, physical crosslinks, some examples of which have been mentioned above, are non-covalent and reversible. For instance, hydrogen bonds show temperature-dependent behavior; i.e., at elevated temperatures, the hydrogen bonds dissociate 36 and the resulting material exhibits a lower viscosity and therefore a better processability.…”

Section: Introductionmentioning

confidence: 99%

Hydrogen bonding and thermoplastic elastomers – a nice couple with temperature-adjustable mechanical properties

et al. 2018

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ab Styrene-butadiene copolymers are modified with varying fractions of benzoic acid moieties being able to perform hydrogen bonding. This is done by using a simple synthetic approach which utilizes click chemistry. Temperature-dependent dynamic mechanical properties are studied, and it turns out that even the apparently rather simple hydrogen bonding motif has a marked impact on the material properties due to the fact that it facilitates the formation of a supramolecular polymer network. Besides a glass transition, the investigated functionalized copolymers exhibit a second endothermic transition, known as a quasi-melting. This is related to the opening of the hydrogen bonding complexes.Additionally to dynamic mechanical analysis (DMA), differential scanning calorimetry (DSC), temperaturedependent infrared (IR) spectroscopy and small angle X-ray scattering (SAXS) are used to understand the structure-property relationships.

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Section: Introductionmentioning

confidence: 99%

Hydrogen bonding and thermoplastic elastomers – a nice couple with temperature-adjustable mechanical properties

et al. 2018

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“…Polymer systems containing covalent bonds of thermoreversible nature form an important class of materials that is extensively researched for application as self‐healing materials . Below the switching temperature (range) such bonds are typically closed and the high strength associated to covalent bonds can be used to improve the crosslink density, mechanical properties, adhesion and solvent resistance of the system.…”

Section: Introductionmentioning

confidence: 99%

Polyurethane adhesives containing Diels–Alder‐based thermoreversible bonds

Turkenburg¹,

Bracht²,

Funke³

et al. 2017

J of Applied Polymer Sci

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A facile two‐step process is developed to obtain polyester urethanes that contain various concentrations of thermoreversible Diels–Alder adduct–based bonds for the development of adhesives. Besides linear systems thermoreversible networks have been included in the study. The reactions are verified using IR‐spectroscopy and gel permeation chromatography analysis. The material properties are characterized with solvent exposure tests, dynamic scanning calorimetry, microindentation and rheology and the potential for application as adhesives is tested with an elcometer. Material properties have been found highly tunable for the system, and high adhesive strengths (off‐scale) are found for polyester urethanes that are doped with an intermediate level Diels–Alder functional groups. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 44972.

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“…Covalent reactions employed in hydrogel self‐healing often require the reapplication of the conditions used for polymerization or the application of an external stimulus, e.g., pH, alternating current (AC), or UV light . There has been extensive research conducted on hydrogels and other polymeric materials that self‐heal in response to a stimulus, and a number of reviews have been published summarizing this work . Hydrogels that utilize dynamic covalent reactions that require no external intervention are less common .…”

Section: Introductionmentioning

confidence: 99%

Self‐Healing Hydrogels

2016

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Over the past few years, there has been a great deal of interest in the development of hydrogel materials with tunable structural, mechanical, and rheological properties, which exhibit rapid and autonomous self-healing and self-recovery for utilization in a broad range of applications, from soft robotics to tissue engineering. However, self-healing hydrogels generally either possess mechanically robust or rapid self-healing properties but not both. Hence, the development of a mechanically robust hydrogel material with autonomous self-healing on the time scale of seconds is yet to be fully realized. Here, the current advances in the development of autonomous self-healing hydrogels are reviewed. Specifically, methods to test self-healing efficiencies and recoveries, mechanisms of autonomous self-healing, and mechanically robust hydrogels are presented. The trends indicate that hydrogels that self-heal better also achieve self-healing faster, as compared to gels that only partially self-heal. Recommendations to guide future development of self-healing hydrogels are offered and the potential relevance of self-healing hydrogels to the exciting research areas of 3D/4D printing, soft robotics, and assisted health technologies is highlighted.

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Improving autonomous self healing via combined chemical/physical principles

Cited by 58 publications

References 130 publications

Hydrogen bonding and thermoplastic elastomers – a nice couple with temperature-adjustable mechanical properties

Hydrogen bonding and thermoplastic elastomers – a nice couple with temperature-adjustable mechanical properties

Polyurethane adhesives containing Diels–Alder‐based thermoreversible bonds

Self‐Healing Hydrogels

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