TY - JOUR
T1 - Triboelectrification of molten linear low-density polyethylene under continuous extrusion
AU - Pérez-Trejo, L.
AU - Pérez-González, J.
AU - de Vargas, L.
AU - Moreno, E.
N1 - Funding Information:
This research was supported by CGPI-IPN (010565, 2003-555) and CONACYT (34971-U). L. P-T has COTEPABE and CONACYT scholarships. J. P-G, L. deV and E. M-G are COFFA-EDI-EDD fellows. We acknowledge the reviewers for very useful references and comments to improve this paper.
PY - 2004/8
Y1 - 2004/8
N2 - The triboelectrification of molten linear low-density polyethylene under continuous extrusion through brass and stainless steel dies was studied in this work within a temperature range from 180 to 210 °C. The electric charge build-up was only observed during the extrusion through the brass die at all the temperatures studied and is attributed to slip at the die wall, namely, to a dynamic friction between the polymer melt and the die wall. The magnitude of the electric charge in the melt increased along with temperature and was dependent on the flow conditions (shear stress and sliding velocity). The electric charge exhibited a maximum for each studied temperature; the lower the temperature the lower the shear stress at which the maximum appeared. The results in this work suggest that such maxima and the further reduction in the electric charge as the shear stress is increased stem from a decrease of the contribution of slip to the average fluid velocity, because of shear thinning in the melt. Finally, friction curves were monotonic for all the temperatures and shear rates studied.
AB - The triboelectrification of molten linear low-density polyethylene under continuous extrusion through brass and stainless steel dies was studied in this work within a temperature range from 180 to 210 °C. The electric charge build-up was only observed during the extrusion through the brass die at all the temperatures studied and is attributed to slip at the die wall, namely, to a dynamic friction between the polymer melt and the die wall. The magnitude of the electric charge in the melt increased along with temperature and was dependent on the flow conditions (shear stress and sliding velocity). The electric charge exhibited a maximum for each studied temperature; the lower the temperature the lower the shear stress at which the maximum appeared. The results in this work suggest that such maxima and the further reduction in the electric charge as the shear stress is increased stem from a decrease of the contribution of slip to the average fluid velocity, because of shear thinning in the melt. Finally, friction curves were monotonic for all the temperatures and shear rates studied.
KW - Continuous extrusion
KW - Polyethylene melts
KW - Slip
KW - Steel and brass dies
KW - Triboelectrification
UR - http://www.scopus.com/inward/record.url?scp=3042821932&partnerID=8YFLogxK
U2 - 10.1016/j.wear.2004.01.004
DO - 10.1016/j.wear.2004.01.004
M3 - Artículo
SN - 0043-1648
VL - 257
SP - 329
EP - 337
JO - Wear
JF - Wear
IS - 3-4
ER -