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Morphology in thermally oxidized high density polyethylene pipes
Author(s) -
Gedde U. W.,
Jansson J.F.,
Terselius B.
Publication year - 1987
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.760271005
Subject(s) - materials science , high density polyethylene , polyethylene , crystallization , composite material , morphology (biology) , optical microscope , texture (cosmology) , melting point , kinetics , polarized light microscopy , chemical engineering , optics , scanning electron microscope , image (mathematics) , physics , quantum mechanics , artificial intelligence , biology , computer science , engineering , genetics
In a continuation of previous work (1), the melting and crystallization behavior of the layered oxidized skin on thermally oxidized inner wall surfaces of different high density polyethylene (HDPE) pipes was studied. By hot stage polarized light microscopy on 5 μm thick cross‐sections of the skin, melting was shown to proceed successively as a front moving inwards as temperature was raised. Analogously, crystallization of the skin layers proceeded with the front advancing outwards towards the skin surface at decreasing temperature. The kinetics were followed and the data was compared with previous DSC thermograms (1) on similar samples. The high temperature melting peak of the oxidized skin reported in earlier DSC‐work (1) is shown to be associated with material with normal spherulitic texture.