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Coefficients of dynamic friction and the mechanical melting mechanism for vinylidene chloride copolymers
Author(s) -
Spalding Mark A.,
Hyun Kun S.,
Jenkins Steven R.,
Kirkpatrick Donald E.
Publication year - 1995
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.760352311
Subject(s) - materials science , high density polyethylene , differential scanning calorimetry , copolymer , composite material , polyethylene , melting temperature , polymer , thermodynamics , physics
Abstract Previous research and this research indicate that the mechanical melting for poly(vinylidene chloride) copolymers (PVDC) is complex. Mechanical melting is defined as the melting (or devitrification) of a polymer when a significant portion of the thermal energy originates from a mechanical energy dissipative process. PVDC mechanically melted on a moving metal surface at temperatures of the test instrument that were considerably lower than the differential scanning calorimetry (DSC) onset melting temperature. PVDC formulated with low levels of high density polyethylene (HDPE), however, melted at metal temperatures near the DSC onset melting temperature. Two different mechanical melting mechanisms are proposed to explan the data, and the frictional data are discussed with respect to solids conveying in a single‐screw, plasticating extruder.