Development of polymer composite materials based on ultra-high molecular weight polyethylene with the high stability of characteristics under the conditions of sharply continental climate

Currently, when developing new functional polymeric materials, especially for arctic purposes, it is not sufficient to provide an increase in strength, elasticity, wear resistance of these materials, but it is necessary to create polymeric materials taking into account operation requirements. One of the important requirements is the stability of properties during operation under climatic factors. 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 exposition on the climatic field testing ground in Yakutsk. Studies of changes in the physical and mechanical parameters of the exposed samples were carried out after 1, 3, 6, 9, 12, 18, 24 months. Studies of changes in samples structure by IR spectroscopy were also carried out. It has been established that under the conditions of sharply continental climate of Yakutia, ultra-high molecular weight polyethylene and a composite containing 5 wt.% of Belum carbon fibers (CF) are subject to aging by the fourth month of exposure. In this regard, ultra-high molecular weight polyethylene was modified not only with carbon fibers, but also with a stabilizer of the СO-4 brand produced by the NIOCH SB RAS. This stabilizer prevents the propagation of destructive-oxidative processes in the composite material. It is found that PCM based on UHMWPE, containing 0.5 wt.% of a stabilizer, retains its deformation and strength properties at the level of an unexposed sample for 270 days. Thus, on the basis of the studies carried out, it has been established that additional modification of the UHMWPE-CF composite with a stabilizer of the CO-4 grade leads to a slowdown in the oxidative-destructive processes in the composite during exposure. Due to this, physical and mechanical indicators under the influence of unfavorable climatic factors remain unchanged for a long time. This fact allows us to predict high performance of developed materials under the conditions of sharply continental climate of Yakutia.

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