Keyword: «polymer composite material»

This paper presents the results of comparative studies of the physical and mechanical properties of ultra-high molecular weight polyethylene and modified polymer composite materials (PCM) before and after bench full-scale tests at the climatic test site in Yakutsk. It is established that in the conditions of the sharply continental climate of Yakutia, ultra-high molecular weight polyethylene and a composite containing 5 wt. % of carbon fibers of the brand "Belum" are aging by the fourth month of exposure. In this regard, ultra-high molecular weight polyethylene was modified not only with carbon fibers to increase the physico-mechanical and tribotechnical parameters, but also a stabilizer of the SO-4 brand produced by NIOH SB RAS was introduced. Based on the conducted studies, it was found that the additional modification of the UHMWPE-UV composite with a stabilizer of the CO-4 brand leads to a slowdown in the photo-oxidative processes of the composite in the open air, which has a positive effect on the preservation of physical and mechanical parameters for a long time under the influence of adverse climatic factors. This fact allows us to predict the high performance of products made of the developed material in the conditions of the sharply continental climate of Yakutia.

This paper presents the results of a study of the effect of functional fillers on the properties and structure of ultra-high molecular weight polyethylene (UHMWPE). 2-Mercaptobenzthiazole (MBT), diphenylguanidine (DPG), tetramethylthiuram disulfide (TMTD) and sulfenamide (CBS) were used as functional additives. The concentration of fillers in UHMWPE was 0.5, 1 and 2 wt.%. It has been established that the introduction of functional additives significantly increases the tensile strength characteristics of the initial polymer. Thus, the maximum increase in tensile strength is observed with the introduction of TMTD and DPG, which showed an increase of 44% and 41% compared to the original UHMWPE, respectively. Relatively high wear resistance is observed in composites containing MBT and CBS. The effectiveness of the use of functional additives as UHMWPE modifiers is shown.

A protective epoxy-polymer composition has been developed, including a filler, a binder and an accelerator for curing the resin of the binder, with the following ratio of components, masses. %: binder – 81; accelerator – 9, filler – 10. The composition allows to increase resistance of polymer composite materials, in particular basalt-plastic reinforcement to mold fungi in water environment and in soil substrate. The advantage of the composition is that it is easy to perform and economical as it does not require complex technological equipment and expensive components for its implementation, and it also has the ability to increase the material stability in mycological environment, which is promising for protection of composites with mechanical damages from fungal attack.

As part of this study, a testing program was developed based on an analysis of the operating conditions of pile foundations in Arctic conditions to determine the type of material and manufacturing technology for polymer composite piles. It was shown that the most significant factors are the combined effects of humidity, thermal cycling, air and soil salinity, and UV radiation. Protective coatings minimize changes in properties and surface damage to the polymer composite. It was determined that basalt-fiber reinforced plastic or fiberglass tubular elements manufactured using a wet winding method can be used for the manufacture of bored piles. Based on the conducted research, an analysis of the types and consequences of PCM pile failures in Arctic conditions was conducted. It was determined that the most hazardous areas of an installed PCM pile are the aboveground portion and the section located in the seasonal thaw zone. These results were verified by field tests at the Yakut Scientific Center of the Siberian Branch of the Russian Academy of Sciences.