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DTA for control of stability in polyolefin wire and cable compounds
Author(s) -
Howard John B.
Publication year - 1973
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.760130606
Subject(s) - polyolefin , extrapolation , range (aeronautics) , materials science , stabilizer (aeronautics) , atmospheric temperature range , polymer , stability (learning theory) , melting temperature , thermal stability , temperature control , differential thermal analysis , thermodynamics , computer science , nanotechnology , composite material , mechanical engineering , chemical engineering , engineering , physics , mathematics , statistics , optics , layer (electronics) , machine learning , diffraction
Differential thermal analysis offers a convenient and rapid way of determining stabilization levels in polyolefin compositions. Since it is normally used at temperatures in the fabrication range, it provides a direct readout of processing stability. At the same time, because the chemistry of the polymer system at these temperatures may be quite different from that at normal use temperatures, judgment must be exercised in attempting to extrapolate high temperature data. New factors can come in at either end of the temperature range which are inoperative at the other extreme. The experimental procedures used are described, and the special precautions necessary for operation down to the 140–150°C range indicated. Problems arising from sample inhomogeneities are discussed, and the critical importance of stabilizer migration in the solid state pointed out, including invalidation of extrapolation down to normal temperatures of data taken above the melting range.