Influence of Microwave on the Structure and Properties of Nanomodified Fluoroplastic

Polymers modified with carbon nanomaterials exhibit enhanced electrical conductivity. The modifier, which is qualitatively distributed in the polymer matrix, actively absorbs microwave waves even with an extremely small introduced volume (up to 1.5 mass parts). Photographs obtained by scanning electron microscopy indicate a uniform distribution of carbon nanotubes in the matrix of fluoroplastic 4. The microwave treatment of the obtained composites showed a significant increase in the temperature of the samples with a heating time of up to 100 sec. even with minimal amounts of modifier added. Strength characteristics for a uniaxial plant of modified materials after microwave increase by 40-50%. The obtained modified materials based on a non-polar polymer matrix have enhanced characteristics of absorption of microwave radiation.

Structure and dynamics of an aqueous solution containing poly-(acrylic acid) and non-ionic surfactant octaethylene glycol n-decyl ether (C10E8) aggregates and their complexes investigated by molecular dynamics simulations

A detailed MD simulation study of the self-assembly structure and thermodynamics of an aqueous solution containing non-ionic surfactant octa ethylene glycol n-decyl ether (C10E8) and non-ionic polar polymer poly(acrylic acid) PAA is presented.

High loading BaTiO3 nanoparticles chemically bonded with fluorinated silicone rubber for largely enhanced dielectric properties of polymer nanocomposites

Integrating high-loading dielectric nanoparticles into polar polymer matrices potentially can profit the intrinsic polarization of each phase and allow for greatly enhanced dielectric properties in polymer nanocomposites. It is however...

Modifying the Metal Oxide Filler with a Silicon-Organic Oligomer in a Solution of an Organic Solvent

The use of tungsten dioxide as a filler for a non-polar polymer matrix is limited due to its high hydrophilicity and abrasiveness, which degrades the properties of the filled polymers. The paper presents the results of studies on the surface modification of tungsten oxide with organosilicon polyethylsiloxane. The mechanisms for modifying the surface of tungsten dioxide, based on the fixation of the modifier under the action of intermolecular forces of attraction and interaction of the hydroxyl groups of the oxide surface with the reactive bonds of the Si-H oligomer, have been established. To create additional active centers in the form of groups (–OH) on the surface of tungsten dioxide, it was boiled, which contributes to the forced hydroxylation of the surface. The adsorption of polyethylsiloxane with powdered tungsten dioxide from n-hexane solution was investigated. The results on determination of the wetting angle of unmodified and modified tungsten dioxide powder are presented. It has been established that modification with polyethylsiloxane leads to an increase in the wetting angle of tungsten dioxide to 121o, which indicates its hydrophobic properties.

Improved Mechanical Properties of Jute Fiber/Polypropylene Composite with Interface Modified by Sodium Lignosulfonate

How to improve the interfacial compatibility between polar fibers and non-polar polymer matrices is still a challenge for the application of natural fiber/polymer composites. In this study, the jute fibers (JF) was firstly treated by coating sodium lignosulfonate (SL) layer, then the JF-SL/polypropylene (PP) composite was fabricated by injection molding technique. The morphology, surface chemical property, surface energy, mechanical properties of JF and JF-SL, as well as the mechanical properties of JF/PP and JF-SL/PP composites were systematically studied. The results showed that the SL coating layer successfully formed on the surface of JF, and the dipole bond and hydrogen bond interaction occurred between the SL and JF. Compared with JF/PP composite, the tensile modulus, tensile strength, flexural modulus and flexural strength of JF-SL/PP composite increased by 8.25%, 16.79%, 16.87% and 19.71%, respectively, due to the enhancement of the interfacial binding force between JF-SL and PP matrix. These results indicate that SL possesses great potential to be used as a compatibilizer to effectively improve the mechanical properties of JF-SL/PP composite. It could provide an reference basis for the feasibility of SL used as a compatibilizer for natural fiber/polymer composites.

Crystallization and co-crystallization of CL-20. Influence of some process conditions on product properties

Crystallization of CL-20 (HNIW) with all the variety of methods faces a number of problems caused by heterogeneous nucleation, polymorphic transformations of the product in the process of crystallization, stability most polymorphic modifications of HNIW under normal conditions, difficulty reproducing granulometric composition and polymorphic purity of the product in laboratory, pilot and industrial facilities. Analysis of literary data shows that important but little researched factors that determine the properties of crystalline product obtained by different methods are: the properties of the crystallizer material; properties of solvents to process the surface of the devices after crystallization; properties of solvents and sediments used in HNIW crystallization. An important element is the analysis of the influence of the type of plasticizers of mixed energy materials (MEM) on the crystallization and co-crystalization processes of HNIW in MEM compositions. It is of some interest to obtain HNIW ultra-dispersing and nanoscale powders in the MEM plasticizer environment, if used as sediments in HNIW crystallization processes. The article presents the results of experimental studies of influence: the type of material from which the crystallizer is made, the influences of the type of polar solvents used to wash the crystallizer before its subsequent use, influences of the type of MEM plasticizers, as sediments or environments for the creation of the emulsion of HNIW solution in emulsion and sedimentary methods, on crystallization (recrystalization) HNIW; polar polymer-type material for co-crystalization in the polar polymer/HNIW system in thin layers under normal conditions and at cryogenic temperature. The results of the research on the co-crystalization of octogen and HNIW in the environment of inert and nitroester plasticizers of MEM are also presented. Glass, aluminum, stainless steel, porcelain and fluoroplast crystallizers were used to crystallize HNIW/acetone/o-xylol. Acetone, water, ethanol, o-xylol in different combinations or sequences were used to wash crystallizers or to process them further before crystallizing. MEM plasticizers were used as sediments instead of o-xylol: transformer oil, dioctyladipineate, propylene glycol, diethylene, triethylene glycol and nitroglycerin. Polar polymer/HNIW casseators used glass, aluminum, stainless steel, fluoroplast and poly-ethylene to co-crystallize in thin layers at room and cryogenic temperatures. Polyvinilacetate, acetyleulose, nitrocellulose were used as polar polymers. The co-crystalization of HNIW with the octogen was considered in model blends with the above MEM plasticizers. Studies allow you to choose the conditions for the crystallization and co-crystallization of HNIW with the provision of reproducible characteristics of variability, polymorphic composition, including for the receipt of a high-dispersive product  -modifications. The possibility of obtaining a high-dispersal product (crystalline HNIW and its co-crystallizates with MEM components) using SEM plasticizers as sediments or components of mixtures has been confirmed, which is a promising direction alternative technologies for making MEM based on high-dispersal fillers.

Influence of zinc oxide in a polar polymer matrix

The creation of films constituted by semiconductor oxides of zinc oxide (ZnO) incorporated into a polar polymer matrix was proposed, looking for such films to be easy to apply, friendly to the environment and compatible with materials. Within the experimental process, the synthesis of styrene copolymers with a polar monomer (methyl methacrylate) was carried out through the suspension and emulsion polymerization processes.