Structure and Segmental Dynamics Heterogeneity in Hybrid Polycyanurate-Polyurethane Networks

Bershteĭn, V. A.; Egorova, L. M.; Ryzhov, V. A.; Yakushev, P. N.; Fainleib, Alexander; Shantalii, T.A.; Pissis, P.

doi:10.1081/mb-100000057

Cited by 27 publications

(13 citation statements)

References 33 publications

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“…Early a series of hybrid materials based on CER networks and LPU were synthesized [18,19], and their structure and segmental dynamics (in the temperature region from -133 to 327 o C) were studied by FTIR, SAXS, DSC, and laser-interferometric creep rate spectroscopy (CRS) techniques [18,19]. Hybridization effect via cyanate/urethane groups chemical interaction was evidenced in these systems, which led to the formation of completely homogeneous structures on a scale of >2 nm, irrespective of material composition.…”

Section: Resultsmentioning

confidence: 99%

“…Our previous experiences showed that the introduction of 30 wt.% of a thermoplastic modifier and the final curing at 180 ºC used did not provide the desirable mechanical strength of the resulting porous films after etching [18]. Therefore, in the present study, we involved the more effective catalytic complex along with increasing the final curing temperature up to 210 °C, and the amount of the modifier was reduced to 10 wt.%.…”

Section: Synthesis Of Cer/lpu Hybrid Network and Preparation Of Thin Filmsmentioning

confidence: 96%

“…Usually, to improve the elastic properties of film-forming materials based on thermosetting polymers, some amount of a linear polymer with suitable elasticity is added. In our previous publications [18,19] we studied different combinations of CERs with some monomers, oligomers and polymers, and effect of the modifier type, chemical structure and concentration on the basic physical properties of the modified CERs based networks. CER/LPU compositions have appeared to be the most suitable because they had improved mechanical properties without any significant loss in thermal stability.…”

Section: Introductionmentioning

confidence: 99%

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Thermally stable nanoporous cyanate ester resin/linear polyurethane hybrid networks created by nuclear technologies

Grigoryeva

Fainleib

Starostenko

et al. 2021

Polymer

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Thermally stable nanoporous polymer films have been created as promising materials for membrane technologies. Thermosetting Cyanate Ester Resins (CERs) and linear polyurethane (LPU) were combined by stepwise thermal curing, and the films of resulting hybrid polymers were irradiated with α-particles followed by chemical etching. Well-defined highly regular nanoporous structures were developed in the films as evidenced by using SEM. No significant changes in chemical structure of the polymer systems obtained after α-irradiation were observed by FTIR spectroscopy measurements. The polymer films obtained on the basis of hybrid networks with the CER/LPU composition equal to 90/10 wt.% had quite narrow pore diameter distribution with average pore diameters around 12 nm. DSC and TGA measurements showed that the thermal characteristics of the nanoporous films were sufficiently high (Тg ~ 167 °C to ~199 °C, Тd5% ~ 293-359 o C, and Тd max ~ 429-457 o C). The CER/LPU nanoporous thermosetting materials demonstrated effective gas transport properties tested with gases, such as О2, СО2, N2, and СН4. The combination of an additional sensitization step using -rays and longer time of chemical etching improved the properties of the nanoporous systems developed. Such materials open the way to numerous applications, for example, as ultrafiltration membranes for advanced technologies, especially under extreme conditions.

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Section: Resultsmentioning

confidence: 99%

Section: Synthesis Of Cer/lpu Hybrid Network and Preparation Of Thin Filmsmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Thermally stable nanoporous cyanate ester resin/linear polyurethane hybrid networks created by nuclear technologies

Grigoryeva

Fainleib

Starostenko

et al. 2021

Polymer

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“…The presence of various nanofillers, such as silica, nanoclays, titania, and metal nanoparticles, leads, in most of the cases, to the restriction of polymer mobility and ability to thermal transitions 7–10. In some exceptions, the impact of the filler is completely differing11–13 mainly due to different type of polymer matrix and filler and/or due to different preparation/processing conditions. Considering all the different results obtained for different nanocomposite systems, it has to be noticed that there is still a high number of open questions to be solved.…”

Section: Introductionmentioning

confidence: 99%

Dielectric and thermal studies of the segmental dynamics of poly(methyl methacrylate)/silica nanocomposites prepared by the sol–gel method

Kyriakos

Raftopoulos

Pissis

et al. 2012

J of Applied Polymer Sci

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ABSTRACT:Poly(methyl methacrylate)/silica (PMMA/SiO x ) nanocomposites were synthesized via sol-gel method and studied by various techniques. The dispersion of the silica particles (10-100 nm) in the matrix was probed by transmission electron microscopy (TEM), while solid-state NMR and Raman spectroscopy detected the formation of an inorganic network with high degree of crosslinking. To elucidate the impact of the filler on the molecular dynamics of the PMMA, different methods were used; namely differential scanning calorimetry, thermally stimulated depolarization current and broadband dielectric relaxation spectroscopy. All three methods observed a significant impact of the nanoparticles on the segmental dynamics of the matrix, which was expressed as an increase of the glass transition temperature (T g ) in terms of calorimetry and as a shift of the a (segmental) relaxation to lower frequencies in terms of dielectric spectroscopy.

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“…Most rubber or thermoplastic additives used have had amino-, epoxy-, phenoxy-or carboxyend groups. Recently, the results of a study of a polycyanurate modi®ed with polyurethane have been published [20 ± 29], where the authors [20,22,28,29] have assumed the ability of urethane groups to react with cyanate groups of the developing polycyanurate network.…”

Section: Introductionmentioning

confidence: 99%

Structure-Properties Relationships for Bisphenol A Polycyanurate Network Modified with Polyoxytetramethylene Glycol

Fainleib¹,

Grigoryeva

Hourston

2002

International Journal of Polymeric Materials

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A series of polycyanurate networks (PCNs), based on the dicyanate of bisphenol A monomer (DCBA), were synthesized in the presence of dierent contents of hydroxylterminated polyoxytetramethylene glycol (PTMG). The chemical structure, T g behaviour, modulus-composition relations and mechanical properties of the modi®ed PCNs were investigated by Fourier transform infrared (FTIR) spectroscopy, dynamic mechanical thermal analysis (DMTA) and mechanical testing. The oligomer modi®er in¯uences the structure of the ®nal networks insofar as it is partly incorporates and partly dissolves in the polycyanurate matrix, and, thus, decreases the ®nal T g of these modi®ed thermosets. All modi®ed polycyanurate networks exhibit a single, broad glass transition that shifted to lower temperature as the modi®er content was increased.

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Structure and Segmental Dynamics Heterogeneity in Hybrid Polycyanurate-Polyurethane Networks

Cited by 27 publications

References 33 publications

Thermally stable nanoporous cyanate ester resin/linear polyurethane hybrid networks created by nuclear technologies

Thermally stable nanoporous cyanate ester resin/linear polyurethane hybrid networks created by nuclear technologies

Dielectric and thermal studies of the segmental dynamics of poly(methyl methacrylate)/silica nanocomposites prepared by the sol–gel method

Structure-Properties Relationships for Bisphenol A Polycyanurate Network Modified with Polyoxytetramethylene Glycol

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