Nickel(II)-pyridinedicarboxamide-co-polydimethylsiloxane complexes as elastic self-healing silicone materials with reversible coordination

Deriabin, Konstantin V.; Ignatova, Nina A.; Kirichenko, Sergey O.; Novikov, Alexander S.; Islamova, Regina M.

doi:10.1016/j.polymer.2020.123119

Cited by 31 publications

(46 citation statements)

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“…In turn, the homoleptic complexes transformed into heteroleptic species at room temperature by absorbing humidity from undried air. Thus, we assume a H 2 O-driven equilibrium (Figure a) and/or reversible ligation between the homoleptic and heteroleptic complexes in 3D polymer networks, as previously reported in the case of Ni-Py-PDMSs …”

Section: Results and Discussionmentioning

confidence: 94%

“…Co-Bipy-PDMSs probably contain a homoleptic complex composed of Co 2+ and Bipy-PDMSs (Figure ). As in the case of Co-Py-PDMSs, the complex provided coordination cross-linking of the linear polymer chains and resulting SH properties, , and its concentration directly affected the cross-linking degree of Co-Bipy-PDMSs.…”

Section: Results and Discussionmentioning

confidence: 99%

“…To summarize, the current work has revealed the key role of the design of ligands and PMCs in terms of the broad variation of mechanical and SH properties and provides a route to produce a variety of cobalt-incorporated SH materials exhibiting useful elastic properties. The obtained cobalt(II)-incorporating polysiloxanes, particularly Co-Bipy-PDMSs, are promising polymers for the fabrication of highly elastic SH membranes, e.g., for optoelectronic devices, , and as coatings for electrokinetic separations and electrostatic discharge materials. , …”

Section: Discussionmentioning

confidence: 99%

“…Polymer–metal complexes (PMCs; in other words, metal centers bound by polymers exhibiting ligation properties) have gained considerable attention in view of the expressed kinetic lability of metal–ligand bonds, particularly when this bonding includes the labile metal centers in Taube’s definition (for instance, aluminum(III), , iron(II,III), − cobalt(II), , nickel(II), zinc(II), ,− and copper(II)) . In such systems, the consequence of coordination bond breaking–coordination bond making plays the role of a zipper, which unzips during the damage of SHMs and zips up upon SH (Figure ).…”

Section: Introductionmentioning

confidence: 99%

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Structural Features of Polymer Ligand Environments Dramatically Affect the Mechanical and Room-Temperature Self-Healing Properties of Cobalt(II)-Incorporating Polysiloxanes

et al. 2021

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Cobalt(II)-pyridinedicarboxamide-co-polydimethylsiloxane (Co-Py-PDMSs) and cobalt(II)-bipyridinedicarboxamide-co-polydimethylsiloxane (Co-Bipy-PDMSs) polymer−metal complexes were prepared by complexation between Py-PDMSs or Bipy-PDMSs ligands and cobalt(II); the metal content in these complexes varied from 0.09 to 2.41 wt %. The Co II binding patterns (the Co−N Py and Co−O coordination in Co-Py-PDMSs and Co−N Bipy in Co-Bipy-PDMSs) were established by UV−vis and IR methods and by comparison with model Co II complexes exhibiting relevant O,N,O-and N,N-coordination environments, respectively. The mechanical properties of the polymer−metal complexes were controlled by the coordination of Py-PDMSs or Bipy-PDMSs to Co II at various metal-toligand molar ratios (1:(1−6)) and by the variation of the polydimethylsiloxane unit length (M n : 850−900, 5000, or 25 000 g•mol −1 ). Utilization of the chelated Py-PDMSs and Bipy-PDMSs polymer ligands, which are capable of tri-or bidentate binding of Co II , led to (2−4)-fold increases in tensile strength (up to 1.75 MPa) and much higher elongation at break ((2−3)-fold increase up to 2100%) compared with the previously reported Co II -based polymer− ligand systems featuring monodentate ligation entities. Changing the main-chain ligand from Py-PDMSs to Bipy-PDMSs led to an increase in tensile strength of (2−4)-fold in comparison with Py-PDMS and a lower hysteresis (4%). The room temperature selfhealing efficiency was up to 96% for Co-Py-PDMSs and 40% for Co-Bipy-PDMSs, as measured for a polydimethylsiloxane unit with M n = 25 000 g•mol −1 .

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Section: Results and Discussionmentioning

confidence: 94%

Section: Results and Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Structural Features of Polymer Ligand Environments Dramatically Affect the Mechanical and Room-Temperature Self-Healing Properties of Cobalt(II)-Incorporating Polysiloxanes

et al. 2021

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“…In order to fabricate C-FRTP with excellent mechanical properties, a new molding method should be developed not only for FRP composites production, but also for a wider range of composites material manufacturing; for example, serving as a new basic method for producing thermoplastic biocomposite [ 8 , 9 ] and other functional composite materials [ 10 , 11 , 12 ]. Currently, there are two main types of technologies being used for FRTP [ 13 , 14 , 15 , 16 ].…”

Section: Introductionmentioning

confidence: 99%

A Facile Molding Method of Continuous Fiber-Reinforced Thermoplastic Composites and Its Mechanical Property

et al. 2022

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The mechanical properties of continuous fiber-reinforced thermoplastic (C-FRTP) composites are commonly lower than those of continuous fiber-reinforced thermosetting plastic (C-FRP) composites. We have developed a new molding method for C-FRTP. In this study, pre-impregnated materials were successfully prepared by polymer solution impregnation method and, finally, C-FRTP was fabricated. The viscosity of the thermoplastic matrix was decreased to approximately 3dPa×s, the same level of epoxy, and the fiber volume fraction was increased from approximately 45 to 60%. The cross-section of specimens were polished by an ion milling system and impregnation condition was investigated by scanning electron microscopy (SEM). The micrographs suggested that thermoplastic polymer was impregnated to every corner of the fiber, and no void was found on the cross-section. It revealed that void-free composites with perfect mechanical properties can be manufactured with this new molding method. All specimens were submitted to a mechanical measuring equipment, and the mechanical properties of the composite specimens were investigated. Mechanical analysis revealed that tensile property and flexural property of C-FRTP were enhanced up to the same level with C-FRP.

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Fabrication of Highly Thermally Resistant and Self‐Healing Polysiloxane Elastomers by Constructing Covalent and Reversible Networks

Cai,

Wang,

Long

et al. 2023

Macromol. Rapid Commun.

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The fabrication of self‐healing elastomers with high thermal stability for use in extreme thermal conditions such as aerospace remains a major challenge. A strategy for preparing self‐healing elastomers with stable covalent bonds and dynamic metal–ligand coordination interactions as crosslinking sites in polydimethylsiloxane (PDMS) is proposed. The added Fe (III) not only serves as the dynamic crosslinking point at room temperature which is crucial for self‐healing performance, but also plays a role as free radical scavenging agent at high temperatures. The results show that the PDMS elastomers possessed an initial thermal degradation temperature over 380 °C and a room temperature self‐healing efficiency as high as 65.7%. Moreover, the char residue at 800 °C of PDMS elastomer reaches 7.19% in nitrogen atmosphere, and up to 14.02% in air atmosphere by doping a small amount (i.e., 0.3 wt%) of Fe (III), which is remarkable for the self‐healing elastomers that contain weak and dynamic bonds with relatively poor thermal stability. This study provides an insight into designing self‐healing PDMS‐based materials that can be targeted for use as high‐temperature thermal protection coatings.

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Nickel(II)-pyridinedicarboxamide-co-polydimethylsiloxane complexes as elastic self-healing silicone materials with reversible coordination

Cited by 31 publications

References 43 publications

Structural Features of Polymer Ligand Environments Dramatically Affect the Mechanical and Room-Temperature Self-Healing Properties of Cobalt(II)-Incorporating Polysiloxanes

Structural Features of Polymer Ligand Environments Dramatically Affect the Mechanical and Room-Temperature Self-Healing Properties of Cobalt(II)-Incorporating Polysiloxanes

A Facile Molding Method of Continuous Fiber-Reinforced Thermoplastic Composites and Its Mechanical Property

Fabrication of Highly Thermally Resistant and Self‐Healing Polysiloxane Elastomers by Constructing Covalent and Reversible Networks

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