Open-chain poly(organophosphazenes). Synthesis and properties

Виноградова, С. В.; Tur, D. R.; Васнев, В. А.

doi:10.1070/rc1998v067n06abeh000342

Cited by 23 publications

(13 citation statements)

References 127 publications

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“…Figure 2a illustrates this behavior. As seen, the polymer layer was compressed to the middle of the second plateau, where biand trilayers coexist (1), then decompressed to the middle of the first plateau (2), then compressed to the complete formation of a tetralayer (3), and decompressed to the initial state (4). During the first decompression the pressure decreases immediately to a constant value below the pressure of monolayer-to-bilayer transformation.…”

Section: ■ Results and Discussionmentioning

confidence: 91%

“…(a) π−A isotherm of PFP-C3 compressed to the middle of the second plateau (1), then decompressed to about a middle of the first plateau (2), then compressed until formation of the complete tetralayer(3), and decompressed to the initial state (4). (b) Surface pressure relaxation of PFP-C3 during pause after compression to the middle of the first plateau (1) with another pause after following partial decompression(2).…”

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Structural Characterization of Self-Organized Mono- and Multilayers of Poly[bis(2,2,3,3-tetrafluoropropoxy)phosphazene] at the Air/Water Interface

et al. 2015

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The layering transitions of mesomorphic poly-[bis(2,2,3,3-tetrafluoropropoxy)phosphazene] induced by compression were found to result in the formation of stable multilayers directly at the air/water interface. This phenomenon is discussed with particular emphasis on its in situ structural characterization by Brewster angle microscopy, infrared spectroscopy, synchrotron grazing incidence X-ray diffraction, and X-ray reflectivity data. Compression of Langmuir monolayer is followed by layer-by-layer growth manifested by pronounced steps in the pressure/area isotherm. Grazing incidence X-ray diffraction reveals only one diffraction peak for the monolayer as well as for multilayers, which corresponds to an interchain spacing d = 12.3 Å. The in-plane correlation length ξ xy reaches an impressive 345 Å for the uncompressed monolayer and 470 Å for the tetralayer, implying a certain mesoscale order similar to a quasi-long-range one. After formation of the four-layer thick film the transition into a 3D crystalline triclinic phase with a = 13.19 Å, b = 11.42 Å, c = 4.83 Å, α = 90°, β = 102°, and γ = 116°is observed. ■ INTRODUCTIONPolyphosphazenes are an important class of polymers due to their structural flexibility, synthetic versatility, and very wide range of properties. 1−4 Among them, fluorinated polyalkoxyphosphazenes (PAPh) attract special attention of the researchers not only as polymer materials possessing a number of such useful practical properties as high hydrophobic and lipophobic behavior, high hydrolytic stability, and low glass transition temperatures 3−6 but also as interesting objects to study various examples of self-ordering of macromolecules. These macromolecules like some linear and cyclolinear polyorganosiloxanes form mesophases with a structure quite different from that of classical liquid crystals; i.e., they possess flexible backbones and do not have mesogenic fragments neither in the main nor in the side chains. Despite their structural flexibility, they have extended main chain conformations in the mesomorphic state. This mesophase, named as condis-crystal or columnar mesophase, is partly disordered as a result of losing of some elements of 3D order and possesses certain intramolecular mobility. However, it behaves as thermodynamically equilibrium crystal. 7−10 The phase behavior of fluorinated PAPh in bulk is determined by an interplay between the overall packing of macromolecules and the arrangement of side groups. In this respect, it is expedient to study formation and behavior of the Langmuir monolayers of polyphosphazenes as they are an excellent model for understanding of specific interactions leading to the formation of 3D ordered systems coming from ordering in two dimensions.The development of novel experimental techniques or enhancements of traditional ones for investigation of selfassembly of amphiphilic molecules at the air/water interface in the 1990s (see, e.g., reviews 11−13 ) allowed a detailed description of the ordered structure of Langmuir monolayers and their changes due to va...

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Section: ■ Results and Discussionmentioning

confidence: 91%

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confidence: 99%

Structural Characterization of Self-Organized Mono- and Multilayers of Poly[bis(2,2,3,3-tetrafluoropropoxy)phosphazene] at the Air/Water Interface

et al. 2015

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“…The potential release of these fluorinated alcohol groups by hydrolysis, should degradation take place, has been related to local antiinflammatory activity (14,15). However, Welle et al (6) and other investigators (16,17) showed that the molecule retains stability and chemical integrity for as long as 24 months. With respect to biocompatibility, some further chemical features are also noteworthy: PTFEP selectively adsorbs albumin (6) and albumin is known to reduce platelet apposition on surfaces (18).…”

Section: Discussion Thrombogenicitymentioning

confidence: 96%

Efficacy of a Polyphosphazene Nanocoat in Reducing Thrombogenicity, In-stent Stenosis, and Inflammatory Response in Porcine Renal and Iliac Artery Stents

Henn¹,

Satzl²,

Christoph³

et al. 2008

Journal of Vascular and Interventional Radiology

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“…The advances in the study of carborane-147 and sulfur-containing 148 condensation polymers and polyorganophosphazenes 149,150 have been adequately covered in recently published papers. Suffice it to mention yet another promising trend which has been successfully developed over the past decade, viz., design and investigation into highly branched dendritic polymers which are considered in detail in special reviews.…”

Section: Discussionmentioning

confidence: 99%

Trends in the development of polycondensation and condensation polymers

Виноградова¹,

Васнев²

2004

Russ. Chem. Rev.

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New trends in the development of polycondensation New trends in the development of polycondensation methods, elucidation of the main principles of macromolecular methods, elucidation of the main principles of macromolecular design of polymeric chains and preparation of novel promising design of polymeric chains and preparation of novel promising condensation polymers are considered and analysed. The biblio-condensation polymers are considered and analysed. The bibliography includes 152 references graphy includes 152 references. . S V Vinogradova, V A Vasnev A N Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, ul. Vavilova 28, 119991 Moscow, Russian Federation. Fax (7-095) 135 50 85. Tel. (7-095) 135 92 25 (S V Vinogradova), (7-095) 135 92 12. E-mail: vasnev@ineos.ac.ru (V A Vasnev)

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Open-chain poly(organophosphazenes). Synthesis and properties

Cited by 23 publications

References 127 publications

Structural Characterization of Self-Organized Mono- and Multilayers of Poly[bis(2,2,3,3-tetrafluoropropoxy)phosphazene] at the Air/Water Interface

Structural Characterization of Self-Organized Mono- and Multilayers of Poly[bis(2,2,3,3-tetrafluoropropoxy)phosphazene] at the Air/Water Interface

Efficacy of a Polyphosphazene Nanocoat in Reducing Thrombogenicity, In-stent Stenosis, and Inflammatory Response in Porcine Renal and Iliac Artery Stents

Trends in the development of polycondensation and condensation polymers

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