Coordination compounds with siloxane/silane-containing ligands capable of self-assembly at nano/micro scale in solid state and in solution

Zaltariov, Mirela‐Fernanda; Cazacu, Maria

doi:10.1016/bs.adioch.2020.03.003

Cited by 5 publications

(4 citation statements)

References 81 publications

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“…The fillers used for the dielectric elastomers are distinct from materials used as fillers by other researchers due to presence of the organosiloxane chain in the complex that provides compatibility with the silicone matrix. To our knowledge there are few studies on using Schiff base metal complexes as filler for siloxanes [ 28 , 29 ]. With structures built around nitrogen atoms and ease of synthesis, the Schiff bases are desirable chelating agents [ 29 ].…”

Section: Introductionmentioning

confidence: 99%

Siloxane Matrix Molecular Weight Influences the Properties of Nanocomposites Based on Metal Complexes and Dielectric Elastomer

Soroceanu¹,

Stiubianu²

2021

Materials

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Siloxane-based elastomers are some of the most sought-after materials for the construction of actuators and equipment for energy harvesting devices. This article focuses on changes of the mechanical (breaking stress, breaking strain, Young’s modulus) and dielectric properties for elastomers prepared with silicones, induced by the variation of molecular weight of the matrix, with three different silicone polymers having 60,000 g/mol, 150,000 g/mol, and 450,000 g/mol (from GPC measurements). Multiple siloxane elastomers were crosslinked with methyltriacetoxysilane using the sol-gel route. The dielectric permittivity values of the elastomers were also enhanced with two different complex structures containing siloxane bond and 3d transition metals as filler materials for polydimethylsiloxane polymers with various molecular weights. The dielectric spectroscopy tests demonstrated a small decrease (5%) for the values of the dielectric permittivity in relation to increased molecular weight of the siloxane polymer, both for samples prepared with pure polymer and for samples with metal complexes. The samples of nanocomposites showed a >50% increase of dielectric permittivity values relative to samples prepared of pure siloxane elastomer. The thermal tests demonstrated that the nanocomposites retained thermal stability similar with samples prepared of pure siloxane elastomer. The behavior under controlled conditions of humidity showed a trend of increased water vapor sorption with increasing molecular weight but an overall hydrophobic stable character of nanocomposites.

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Section: Introductionmentioning

confidence: 99%

Siloxane Matrix Molecular Weight Influences the Properties of Nanocomposites Based on Metal Complexes and Dielectric Elastomer

Soroceanu¹,

Stiubianu²

2021

Materials

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“…Thus, a series of Schiff bases developed mainly by the reaction of either 1,3-bis(3-aminopropyl)tetramethyldisiloxane or in-lab synthesized diamine 1,3-bis(amino-phenylene-ester-methylene)tetramethyldisiloxane by complexation with metals forming highly crystalline compounds. More than 30 such unique structures have been recorded in the crystallographic database, CCDC [ 125 ]. They are generally molecular compounds, some of which develop weak intermolecular interactions.…”

Section: Highly Ordered Coordination Polymers Containing Silicon or Silicone Motifmentioning

confidence: 99%

From Amorphous Silicones to Si-Containing Highly Ordered Polymers: Some Romanian Contributions in the Field

Cazacu¹,

Racleş²,

Zaltariov³

et al. 2021

Polymers

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Polydimethylsiloxane (PDMS), in spite of its well-defined helical structure, is an amorphous fluid even at extremely high molecular weights. The cause of this behavior is the high flexibility of the siloxane backbone and the lack of intermolecular interactions attributed to the presence of methyl groups. These make PDMS incompatible with almost any organic or inorganic component leading to phase separation in siloxane-siloxane copolymers containing blocks with polar organic groups and in siloxane-organic copolymers, where dimethylsiloxane segments co-exist with organic ones. Self-assembly at the micro- or nanometric scale is common in certain mixed structures, including micelles, vesicles, et cetera, manifesting reversibly in response to an external stimulus. Polymers with a very high degree of ordering in the form of high-quality crystals were obtained when siloxane/silane segments co-exist with coordinated metal blocks in the polymer chain. While in the case of coordination of secondary building units (SBUs) with siloxane ligands 1D chains are formed; when coordination is achieved in the presence of a mixture of ligands, siloxane and organic, 2D structures are formed in most cases. The Romanian research group’s results regarding these aspects are reviewed: from the synthesis of classic, amorphous silicone products, to their adaptation for use in emerging fields and to new self-assembled or highly ordered structures with properties that create perspectives for the use of silicones in hitherto unexpected areas.

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“…Despite their remarkable characteristics, aromatic poly(azomethine)s exhibit limited solubility in organic solvents and elevated melting temperatures, thereby constituting significant impediments for their viable industrial applications. Incorporating polar groups or flexible units like siloxane units into the conjugated aromatic azomethine frameworks presents an alternative way for enhancing their attributes. ,, Ester or ether linkage-containing poly(siloxane-azomethine)s have been appeared in the literature. − Furthermore, it is widely recognized that flame retardants incorporating silicon offer the distinct advantage of exceptional chemical stability and elevated resistance to high temperatures. , In addition, silicon- and phosphorus-incorporating flame retardants are recognized as environmentally benign flame retardant agents, offering an alternative choice for effectively augmenting the thermal stability of materials. − Due to the synergistic interaction between phosphorus and silicon elements, compounds incorporating phosphorus have been recognized as one of the potent flame retardants in many recent investigations. − Besides, the inclusion of phosphorus within the polymer matrix has the potential to enhance solubility and thermal stability. − …”

Section: Introductionmentioning

confidence: 99%

Comparative Study of Bis-Schiff Case Containing Conjugated Oligomers Based on Phosphate and Silane Moieties: Investigation of Photophysical and Thermal Properties

Kolcu,

Çulhaoğlu,

Kaya

2024

ACS Omega

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Coordination compounds with siloxane/silane-containing ligands capable of self-assembly at nano/micro scale in solid state and in solution

Cited by 5 publications

References 81 publications

Siloxane Matrix Molecular Weight Influences the Properties of Nanocomposites Based on Metal Complexes and Dielectric Elastomer

Siloxane Matrix Molecular Weight Influences the Properties of Nanocomposites Based on Metal Complexes and Dielectric Elastomer

From Amorphous Silicones to Si-Containing Highly Ordered Polymers: Some Romanian Contributions in the Field

Comparative Study of Bis-Schiff Case Containing Conjugated Oligomers Based on Phosphate and Silane Moieties: Investigation of Photophysical and Thermal Properties

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