title: Nanostructurization and thermal properties of polyethylenes' welds.
abstract: As it is known, polyethylene (PE) is one of the common materials in the modern world, and PE products take the major share on industrial and trade markets. For example, various types of technical PE like PE-63, PE-80, and PE-100 have wide industrial applications, i.e., in construction, for pipeline systems etc. A rapid development of plastics industry outstrips detailed investigation of welding processes and welds' formation mechanism, so they remain unexplored. There is still no final answer to the question how weld's microstructure forms. Such conditions limit our way to the understanding of the problem and, respectively, prevent scientific approaches to the welding of more complicated (from chemical point of view) types of polymers than PE. Taking into account state-of-the-art, the article presents results of complex studies of PE weld, its structure, thermophysical and operational characteristics, analysis of these results, and basing on that some hypotheses of welded joint and weld structure formation. It is shown that welding of dissimilar types of polyethylene, like PE-80 and PE-100, leads to the formation of better-ordered crystallites, restructuring the crystalline phase, and amorphous areas with internal stresses in the welding zone.
authors.affiliation: Plastics Welding Department, E.O.Paton Electric Welding Institute, National Academy of Sciences of Ukraine, B.8, 11, Bozhenko Str, 03680 Kyiv-150, Ukraine.
authors.forename: Anatoliy
authors.initials: A
authors.lastname: Galchun
authors.affiliation: Plastics Welding Department, E.O.Paton Electric Welding Institute, National Academy of Sciences of Ukraine, B.8, 11, Bozhenko Str, 03680 Kyiv-150, Ukraine.
authors.forename: Nikolay
authors.initials: N
authors.lastname: Korab
authors.affiliation: Plastics Welding Department, E.O.Paton Electric Welding Institute, National Academy of Sciences of Ukraine, B.8, 11, Bozhenko Str, 03680 Kyiv-150, Ukraine.
authors.forename: Volodymyr
authors.initials: V
authors.lastname: Kondratenko
authors.affiliation: Plastics Welding Department, E.O.Paton Electric Welding Institute, National Academy of Sciences of Ukraine, B.8, 11, Bozhenko Str, 03680 Kyiv-150, Ukraine ; Institute of Macromolecular Chemistry, National Academy of Sciences of Ukraine, 48 Kharkivske Avenue, 02160 Kiev, Ukraine.
authors.forename: Valeriy
authors.initials: V
authors.lastname: Demchenko
authors.affiliation: Plastics Welding Department, E.O.Paton Electric Welding Institute, National Academy of Sciences of Ukraine, B.8, 11, Bozhenko Str, 03680 Kyiv-150, Ukraine.
authors.forename: Andriy
authors.initials: A
authors.lastname: Shadrin
authors.affiliation: Plastics Welding Department, E.O.Paton Electric Welding Institute, National Academy of Sciences of Ukraine, B.8, 11, Bozhenko Str, 03680 Kyiv-150, Ukraine.
authors.forename: Vitaliy
authors.initials: V
authors.lastname: Anistratenko
authors.affiliation: Plastics Welding Department, E.O.Paton Electric Welding Institute, National Academy of Sciences of Ukraine, B.8, 11, Bozhenko Str, 03680 Kyiv-150, Ukraine ; Institute of Macromolecular Chemistry, National Academy of Sciences of Ukraine, 48 Kharkivske Avenue, 02160 Kiev, Ukraine.
authors.forename: Maksym
authors.initials: M
authors.lastname: Iurzhenko
keywords: 81.05.Lg; 81.07.-b; 81.20.Vj