Crazing of polymers in the presence of hyperbranched poly(ethoxysiloxane)

Трофимчук, Е. С.; Никонорова, Н. И.; Nesterova, E. A.; Eliseev, Alexandr; Семенова, Е. В.; Meshkov, I. B.; Kazakova, V. V.; Muzafarov, А. М.; Volynskiĭ, A. L.; Бакеев, Н. Ф.

doi:10.1134/s0965545x07100070

Cited by 5 publications

(3 citation statements)

References 2 publications

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“…Previously, a method was developed for the incorporation of an SiO 2 phase into polymer films and the creation of polymer–silica nanocomposites using the crazing mechanism. In this work, a liquid precursor, hyperbranched polyethoxysiloxane (HPEOS), [45] and its isopropanol solutions with different concentrations were loaded into the pores of the polymer by impregnation.…”

Section: Resultsmentioning

confidence: 99%

“…Recently, we have developed an approach for the preparation of polymer–silica nanocomposites with the use of crazing for the volume filling of matrices with liquid precursors (tetraethoxysilane, hyperbranched polyethoxysiloxane, etc. ), the hydrolytic condensation of which in the presence of acidic or basic catalysts gives rise to the formation of SiO 2 directly in nanopores . The structure of such polypropylene–silica composites varies depending on the content of the inorganic component from discrete silica nanoparticles (less than 15 wt% SiO 2 ) to interpenetrating networks of a polymeric matrix and a 3D silica framework (more than 25 wt% SiO 2 ) .…”

Section: Introductionmentioning

confidence: 99%

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Polyethylene–Silica Nanocomposites with the Structure of Semi‐Interpenetrating Networks

Трофимчук

Meshkov

Kandlina

et al. 2019

Macro Materials & Eng

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Organic–inorganic nanocomposites with the structure of interpenetrating or semi‐interpenetrating networks are considered as advanced materials, since they have improved thermal and mechanical properties. An alternative approach to the preparation of such hybrid systems is proposed. It is based on the synthesis of silica from the precursor of hyperbranched polyethoxysiloxane by the hydrolytic condensation reaction in the volume of pores of a polymer matrix (bulk porosity is 40 vol%) stretched via the environmental crazing mechanism. Polyethylene–silica nanocomposites with the structure of semi‐interpenetrating networks when the content of silica is not less than 20–25 wt% are obtained. These composites can undergo an additional phase separation at a temperature of 160 °C (above the melting point of polyethylene), which is accompanied by an increase in the size of the polymer phase with the formation of macrophases. At the same time, the environment (orthophosphoric acid), in which the composite is heated, fills the pores that have appeared. As a result, the content of the third component with the new functionality increases up to 50 wt%, which allowed us to impart proton‐conducting properties to the composite material and preserve its shape stability.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Polyethylene–Silica Nanocomposites with the Structure of Semi‐Interpenetrating Networks

Трофимчук

Meshkov

Kandlina

et al. 2019

Macro Materials & Eng

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“…The feature of simultaneous development of the pores in the drawn polymer and their filling with the solution underlies the original method of polymer-based nanocomposite production taking advantage of crazing. [27][28][29] In the above-cited studies, polymer deformation via the crazing mechanism in the solutions of various low-molecular weight compounds has been addressed.…”

Section: Introductionmentioning

confidence: 99%

Effects of tensile strain on the peculiarities of PEO penetration into the nanoporous structure of PET deformed via the crazing mechanism

Rukhlya

Yarysheva

Volynskiĭ

et al. 2016

Phys. Chem. Chem. Phys.

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Solvent crazing involves the development of a highly dispersed fibrillar-porous structure with dimensions of pores and craze fibrils of about 2-20 nm, and crazing by itself can be treated as a universal method for the development of nanoscale porosity. The penetration and release of poly(ethylene oxide) macromolecules into and from the crazes during the development of the nanoporous structure of poly(ethylene terephthalate) have been studied. In particular, PET has been deformed in dilute or semidilute (unentangled as well as entangled) solutions of PEO (a Mw of 4 and 40 kDa) via the mechanism of solvent crazing. Hydrodynamic coil radii Rh, blob sizes ξ, and concentration ranges (crossover and entanglement concentrations) have been determined for the PEO solutions. The evolution of the craze structure (change in porosity W and pore diameters d) has been described as a function of the tensile strain of PET during its drawing in an adsorption-active medium and in the PEO solutions. PEO has been shown to penetrate into the nanoporous structure of the crazes under the conditions corresponding to Rh≤d and ξ < d. It has been shown that coagulation processes in the structure of crazed PET, PEO adsorption at the highly developed surface of PET, and the mechanism of PEO transport in the nanopores are equally important factors affecting the direction of the macromolecule mass transfer in the nanopores (penetration or release) and PEO content variation as a function of PET tensile strain.

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Dyeing of polyester and polyamide at low temperature using solvent crazing technique

2015

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Crazing of polymers in the presence of hyperbranched poly(ethoxysiloxane)

Cited by 5 publications

References 2 publications

Polyethylene–Silica Nanocomposites with the Structure of Semi‐Interpenetrating Networks

Polyethylene–Silica Nanocomposites with the Structure of Semi‐Interpenetrating Networks

Effects of tensile strain on the peculiarities of PEO penetration into the nanoporous structure of PET deformed via the crazing mechanism

Dyeing of polyester and polyamide at low temperature using solvent crazing technique

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