polyethylene

ANALYSIS OF PROCESSES WHICH OCCUR DURING THE DESTRUCTION OF A COPPER SHELL ON POLYETHYLENE GRANULES

The geometric dimensions of the copper shell formed by chemical deposition on a spherical polyethylene granule were calculated. It is shown that the main factor determining the thickness of the formed copper layer is the initial size of the polyethylene granule. The processes of destruction of the copper shell formed on the polyethylene granule during thermal expansion of the polymer are considered. The values of the limit temperatures in which the copper shell still retains its integrity depending on its thickness are calculated.

Activation of polyethylene granules by finely dispersed zinc

The results of experimental researches of features of mechanical activation of polyethylene granules with finely dispersed zinc in a ball mill, and also results of research of chemical copper plating of activated polyethylene granules are given. The influence of the ratio of polyethylene granules and fine zinc, the speed of rotation of the ball mill and the duration of activation, as well as the degree of loading of the components in the activation process of polyethylene granules was studied.

PECULIARITIES OF METALIZATION OF PULLED POLYETHYLENE

The results of experimental studies of the peculiarities of metallization of granular polyethylene are presented. The influence of concentration factors on the metallization process of zinc-activated polyethylene granules of brand Liten PL-10 was investigated. It is established that by changing the concentration of copper sulfate and sodium hydroxide, as well as the degree of loading of polymeric raw materials, it is possible to effectively regulate the amount of recovered copper on granules of polyethylene, and therefore the thickness of the metal layer formed on them.

USAGE OF WASTE VEGETABLE OIL FOR MAKING POLYMER COMPOSITES

In the food industry and public catering establishments of Ukraine, a sufficiently large amount of oil is left, which was first used during the roasting and cooking of various food, such as vegetables and fish during canning, french fries, pancakes, pies and the like. At high temperatures during contact with the food and moisture contained in it, the processes of thermal decomposition, oxidation, polymerization and so on, the oil accumulates harmful to man substances such as aldehydes, acids, ketenes, polycyclic compounds, etc. In this case, the oil becomes unsuitable for further food use.

REGULARITIES OF THE TECHNOLOGICAL RAW MATERIAL CREATION FOR EXTRUSION OF POLYETHYLENE PIPES

The growing pace of Ukrainian polymer pipes market is significantly ahead of other markets for polymer products, which is being explained by the successful competition of their operational properties with pipes made of traditional materials - steel, cast iron, concrete.

Regarding this an important task during the production of water pressure pipes is the obtaining of technological raw materials based on polyethylene with the necessary technological capacity, which will solve the above problems.

Rheological properties of melts and x-ray method of study of cross-linked polyethylene

In the paper, the X-ray study of cross-linked polyethylene with isopropenyl styrene or acrylonitrile was carried out. It is shown that cross-linking leads to a significant decrease in the area of the exothermic peak, an increase in the resistance of the structured system to thermal oxidation. These data confirm that the increase in resistance to thermal aging of polyethylene cross-linked with acrylonitrile or isopropenyl styrene fraction.

Ethylene Extrusion Polymerization by Heterogeneous bi-Supported Ziegler-Natta Catalysts

The MCM-41 (Mobil Composition of Matter) and SBA-16 (Santa Barbara Amorphous) supported TiCl4 and TiCl4/MgCl2 catalysts with different molar ratios of Mg/Ti were synthesized and used for ethylene polymerization under atmospheric pressure. The nanochannels of these supports serve as a nanoscale polymerization reactor and the polyethylene nanofibers were extruded during the reaction. The effect of MgCl2 on catalytic activity and morphology of resulting polyethylene has been investigated too.

Brazilian Mineral Clay as Support for Metallocene Catalyst in the Synthesis of Polyethylene

Silica was compared with clays as supports for metallocene. Ethylene homopolymerization with both homogeneous and heterogeneous catalysts was performed. Activation energy was higher for
(n-BuCp)2ZrCl2/SiO2/MAO, although high activities were obtained for catalysts with clay. They showed Ea close to that of homogeneous precursor. Catalyst/clay control polymer morphology until 363 K

 

Influence of the Preparation Technique of MgCl2/TiCl4 Ziegler-Natta Catalyst on the Performance in Ethylene and Propylene Polymerization

Different methods to remove the alcohol of adduct MgCl2nEtOH were studied to obtain Ziegler-Natta catalysts for evaluation in ethylene and propylene polymerization. Thus, the adduct MgCl2nEtOH was submitted to thermal dealcoholation, as well as chemical dealcoholation with different substances: titanium tetrachloride, triethylaluminum, and dichloro-dimethylsilane. Thermogravimetric analyses (TGA) were performed to obtain information on the thermal characteristics of adducts and prepared supported catalysts.