Preparation and properties of novel binary and ternary highly amorphous poly(vinyl alcohol)-based composites with hybrid nanofillers

Smart protective coatings and devices are currently of great interest. In particular, they can absorb or reflect harmful waves of electromagnetic interference (EMI). In this work, novel binary and ternary composites with highly amorphous poly(vinyl alcohol) (HAVOH) as a matrix and single-walled carbon nanotubes (SWCNTs) and MXenes as nanofillers were prepared. HAVOH is a recently patented kind of poly(vinyl alcohol) (PVOH) that was modified with diol monomers. MXenes are a new type of inorganic two-dimensional (2D) nanoparticle consisting of carbides, nitrides and carbonitrides. Three series of composites, HAVOH/SWCNTs, HAVOH/MXenes and HAVOH/SWCNTs/MXenes, were prepared using the solvent casting method. Samples were tested with various methods to study their structure, electrical properties, thermal behavior and EMI-shielding properties. HAVOH/3.0 wt.% SWCNTs/3.0 wt.% MXene specimens revealed a shielding effectiveness of 55 dB, which is 122 times better than that of the neat matrix. These results are promising for the fabrication of films with protective effects against EMI.Drexel University; Horizon 2020 Framework Programme, H2020; H2020 Marie Skłodowska-Curie Actions, MSCA, (777810, APVV 19–0465, VEGA 02/0006/22); European Cooperation in Science and Technology, COST, (CA19118)Authors greatly appreciate Prof. Yury Gogotsi and Dr. Christopher Shuck (Drexel University, USA) for providing the MXene paste

Preparation and characterization of selected types of inorganic nanomaterials

Byly připraveny různé druhy nanočástic ZnO do nátěrových systémů s různou hydrofobicitou (vodného, alkydového a polyakrylátového). Připravené vzorky ZnO a vytvrzených disperzí byly charakterizovány pomocí různých metod. Systémy obsahující nanočásticový ZnO vykazovaly ve srovnání s neplněnými systémy lepší mechanické a fyzikálně chemické vlastnosti.Various sorts of zinc oxide nanoparticles designed for paint systems with different hydrophobicity (water, alkyde and polyacrylate system) were prepared. Samples of ZnO and hardened dispersions were characterized using different methods. Systems containing ZnO nanoparticles showed better mechanical and physico-chemical properties in comparison with unfilled systems.Fakulta chemicko-technologick

Preparation of zinc oxide nanoparticles for polymeric systems

The aim of the work was the synthesis of zinc oxide nanoparticles incorporated into water-based polymer systems together with assessment of their effect on the mechanical properties of the prepared nanocomposites. ZnO nanoparticles were prepared by basic precipitation of zinc salts in water. To ensure perfect compatibility with the polymeric systems and to control the particle size, the ZnO nanoparticle surface was modified by polymeric surfactants tailored for this purpose. ZnO particles were physically bonded to the water-based system via electrostatic interactions. All the composites have shown improved mechanical properties compared to the unmodified systems depending on the ZnO concentration in the water-based system

Příprava nanočástic oxidu zinečnatého pro polymerní systémy

The aim of the work was the synthesis of zinc oxide nanoparticles in corporated into water-based polymer systems together with assessment of thein effect on the mechanical properties of the prepared nanocomposites. ZnO nanoparticles were prepared by basic precipitation of zinc salts in water. To ensure perfekt kompatibility with the polymeric systems and to kontrol the partije size, the ZnO nanoparticle surface was modified by polymeric surfactants tailored for this purpose. ZnO particles were physically bonded to the water-based system via electrostatic interactions. All the composites have shown improved mechanical properties compared to the unmodified systems depending on the ZnO concentration in the water-based system.zabudované do vodorozpustného polymerního systému a zhodnotit vliv částic na mechanické vlastnosti připravených nanokompozitů. Nanočástice ZnO byly připraveny srážecí reakcí zinečnaté soli a příslušné báze ve vodném prostředí.Pro zajištění dokonalé kompatibility s polymerními systémy a pro kontrolu velikosti částic byl povrch nanočástic ZnO modifikován pomocí polymerních povrchově aktivních látek upravených pro tento účel. Modifikátor na částicíchZnO bylna vodorozpustný systém navázán elektrostaticky. Všechny kompozity vykazovaly zlepšené mechanické vlastnosti ve srovnání s nemodifikovanými systémy v závislosti na koncentraci ZnO ve vodorozpustném systému

Příprava nanočástic oxidu zinečnatého pro polymerní systémy

The aim of the work was the synthesis of zinc oxide nanoparticles in corporated into water-based polymer systems together with assessment of thein effect on the mechanical properties of the prepared nanocomposites. ZnO nanoparticles were prepared by basic precipitation of zinc salts in water. To ensure perfekt kompatibility with the polymeric systems and to kontrol the partije size, the ZnO nanoparticle surface was modified by polymeric surfactants tailored for this purpose. ZnO particles were physically bonded to the water-based system via electrostatic interactions. All the composites have shown improved mechanical properties compared to the unmodified systems depending on the ZnO concentration in the water-based system.zabudované do vodorozpustného polymerního systému a zhodnotit vliv částic na mechanické vlastnosti připravených nanokompozitů. Nanočástice ZnO byly připraveny srážecí reakcí zinečnaté soli a příslušné báze ve vodném prostředí.Pro zajištění dokonalé kompatibility s polymerními systémy a pro kontrolu velikosti částic byl povrch nanočástic ZnO modifikován pomocí polymerních povrchově aktivních látek upravených pro tento účel. Modifikátor na částicíchZnO bylna vodorozpustný systém navázán elektrostaticky. Všechny kompozity vykazovaly zlepšené mechanické vlastnosti ve srovnání s nemodifikovanými systémy v závislosti na koncentraci ZnO ve vodorozpustném systému