Compression creep of molten low-density polyethylene

Autor:	J. V. Aleman
Rok vydání:	1992
Předmět:	Polymers and Plastics Thermodynamics General Chemistry Polyethylene Compression (physics) Viscoelasticity Surfaces Coatings and Films Stress (mechanics) Viscosity chemistry.chemical_compound Low-density polyethylene Creep chemistry Materials Chemistry Extrusion
Zdroj:	Journal of Applied Polymer Science. 44:1017-1025
ISSN:	1097-4628 0021-8995
Popis:	Viscoelastic parameters of low-density polyethylene melt (LDPE) in compression creep have been measured. Volume deformation (k%) increases as pressure (P) increases and temperature (T) decreases. Plots of the bulk creep compliance B(t) vs. time (t) may be shifted to provide master curves. As the pressure and the temperature increase, the pressure shift factors (bp and ap) increase almost linearly [activation volumes (ΔV*) varying from 1.0 to 15.0 cm3 mol], while the temperature-shift factors (bT and aT) decrease. The steady-state creep compliance (Bs) describes the recoverable storage of elastic energy (Be) and seems to be related to the extrusion die-swell (Bsc/Bsd). Volume viscosity (ηK) decreases with increasing stress (P) and increasing temperature (T).
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::cb641601c071c7ccb95a15b6f926e033 https://doi.org/10.1002/app.1992.070440611 Zobrazit plný text záznamu Plný text