Synthesis and property evaluations of highly filled polyimide composites under thermal cycling conditions from -190 °C to +200 °C

This paper presents data on the synthesis of composites based on polyimide and modified tungsten (IV) oxide (WO₂). The resulting, highly filled, polyimide/WO₂ composites were investigated by electron microscopy and thermal analysis in a gas environment of oxygen and argon. The maximum content of modified WO₂, in the studied composites, was 60 wt%. The introduction of WO₂ increases the thermal stability of the composite

Synthesis of PI/POSS nanocomposite films based on track nuclear membranes and assessment of their resistance to oxygen plasma flow

This work presents, for the first time, data on the possibility of synthesizing polyimide nanocomposite films based on track nuclear membranes and organosiloxane (polyhedral oligomeric silsesquioxanes) POSS structures. The synthesis of the nanocomposite films was carried out by filling the tracks of a polyimide membrane with POSS structures under hydrothermal conditions in a high-pressure reactor. The surface and mechanical characteristics of the developed nanocomposite films were studied, and the results of their resistance to the flow of oxygen plasma are presente

Gamma radiation attenuation characteristics of composites based on polyimide track membranes filled with nanodispersed Pb

The paper presents data on the effect of γ-radiation on polymer composites based on polyimide track membranes filled with nanodispersed lead. The radiation-protective properties of the composites were studied by theoretical and experimental method

Changes in surface properties of PI/WO₂ сoatings after vacuum ultraviolet irradiation

This paper presents the results of a study on the effects of deep vacuum and vacuum ultraviolet (VUV) irradiation on polymer сoatings based on thermoplastic polyimide (PI) and tungsten oxide (WO₂

Transport of neutrons and γ quanta through a highly filled polymer composite

The transport of neutrons and γ quanta of various energies through a polymer composite based on tungsten-filled track membranes is studie

Effect of Laser Modification on Composite Films with Nanodispersed SiO2

ABSTRACT: Introduction. This research is aimed at studying the effect of laser modification on composite films obtained on the basis of polyimide track (nuclear) membranes and filled with nanodispersed SiO2; to change their optical and structural properties. Materials and research methods. Polyimide track (nuclear) membranes were used as a polymer matrix. Track diameter is 200 nm, membrane thickness is 25 μm. The tracks were filled with nanosized SiO2 by hydrolysis of tetraethoxysilane in the presence of track membranes. For composite film surface modification, we used ytterbium pulsed fiber laser Minimarker 2-20 A4 PA. We studied the change in the surface microscopy of composite films, their optical density, IR-Fourier spectra and surface wettability depending on laser treatment. Results and discussion. The authors have found the possibility of creating a composite film based on a polyimide track (nuclear) membrane and nanodispersed SiO2 by hydrolysis of tetraethoxysilane in the presence of a membrane. It is shown with the energy dispersive analysis method that silicon oxide has completely filled the pore volume of the track membrane. Laser modification of the composite material surface (composite film) leads to an increase in the contact angle of wetting from θ = 66.75 ± 1.55° to θ = 101.52 ± 3.03°. Thus, the material acquires hydrophobic properties. Also, the laser films modification has a positive effect on the transmittance of the films, namely, this coefficient increases. The greatest change is observed in the infrared region of еmitted spectrum, the average increase in transmission is +70.48%. Conclusion. The obtained results of the study are of great importance for understanding the mechanisms of creating composite films with improved optical properties, which can later be used to create composite films with desired optical properties for various application

Using multilayer polymer PI/Pb composites for protection against X-ray bremsstrahlung in outer space

This paper presents data about the radiation-protective characteristics of multilayer polyimide/lead (PI/Pb) composites for X-ray radiation. Multilayer composites were obtained by collecting lead-filled polyimide track membranes into a sandwich of the required thicknes

Gamma radiation attenuation characteristics of polyimide composite with WO2

This study presents the effect of γ-sources on polyimide composites with WO