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Degradation of polymeric compositions in vacuum to 10 −9 mm Hg in evaporation and sliding friction experiments
Author(s) -
Buckley D. H.,
Hohnson R. L.
Publication year - 1964
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.760040412
Subject(s) - materials science , polymer , evaporation , composite material , fluorocarbon , ambient pressure , coefficient of friction , ultra high vacuum , vacuum evaporation , friction coefficient , thermodynamics , nanotechnology , thin film , physics
Abstract Solid compositons studied included PTFE, PCFE, polyimides, both filled and unfilled, and fluorocarbon telomers. Evaporation experiments were conducted at ambient temperatures to fluorocarbon telomers. Evaporaton experiments were conducted at ambient temperatures to 1100°F and pressures to 10 −8 mm Hg. Various molecular weights of different polymers were examined. Results indicate that evaporation rates in vacuum for polymers vary with molecular weight. Friction and wear experiments were conducted with a 3‐16‐inch‐radius rider hemisphere (usually polymer) sliding on a flat disk (various materials) at speeds to 1480 feet per minute with a 1000‐gram load on the rider specimen and at an ambient pressure of 10 −9 mm Hg. Fillers were found to influence markedly the wear of PTFE and PCFE in vacuum as a result of changes in heat dissipation properties, but they showed little or no influence on friction.