Implemented assessment of the mechanical behavior of reinforced synthetic fibers of polyethylene pipes, which are provided in the construction adhesive layer connecting the reinforcing plastic shells and pipes. Presents the results of quasistatic tests the tensile strength of model samples in the range of low climatic temperature and speed tests 25-100mm/min. The dependence of the temperature of ductile-brittle transition in the mechanism of destruction of model samples of speed tests, which at 100 mm/min up to 0°С. The mechanism of destruction of a model sample of the reinforced polyethylene pipe, consisting in cracking of the technological layer connected with layers of PE80 which ability to braking of a crack and defines transition from viscous destruction to fragile at fall of temperature of tests is interpreted. It appears that this result emphasizes the need to further clarify and harmonize the existing regulatory requirements on the use and operation of pipes and polyethylene pipelines in cold climate regions.
Keywords: reinforced polyethylene pipe, pipeline, temperature, adhesive layer, strength, crack, viscosity, brittleness, cold climate
The investigated nanocomposites are characterized by more uniform distribution of amorphous and crystal phases. An optimal number of crystallization centers - nanoparticles leads to improve mechanical properties of polyethylenes. Introduction of nanofillers into a polymer matrix leads to the formation of cryptocrystalline supermolecular structure by reducing of the thermodynamic threshold of crystallization.
Keywords: low-pressure polyethylene, magnesium spinel, zeolites, nanofiller, the degree of crystallinity, X-ray diffraction, atomic force microscopy
Information about authors of issue №4 (2011)
Keywords: authors