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A comparison of the flow behavior of linear polyethylene, poly(butylene terephthalate), and poly(ethylene terephthalate)
Author(s) -
Boudreaux Edwin,
Cuculo John A.
Publication year - 1982
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1982.070270131
Subject(s) - materials science , high density polyethylene , polyethylene terephthalate , composite material , ethylene , shear rate , pressure drop , drop (telecommunication) , polymer chemistry , activation energy , viscosity , shear flow , polyethylene , poly ethylene , thermodynamics , organic chemistry , chemistry , physics , computer science , catalysis , telecommunications
The viscous and elastic properties of linear high density polyethylene (HDPE), poly(butylene terephthalate) (PBT), and poly(ethylene terephthalate) (PET) are investigated using an Instron capillary rheometer and the Philippoff–Gaskins–Bagley analysis. The viscous properties studied are the shear viscosity and the constant shear rate activation energy and the elastic properties studied are the entrance pressure drop and the end correction. The variables are shear rate and temperature. The order of decreasing viscosity is HDPE>PET>PBT; the order of decreasing activation energy is PB>PET>HDPE; the order of decreasing entrance pressure drop is HDPE>PET>PBT; and the order of decreasing end correction is PBT>PET>HDPE. As temperature increases, both viscosity and entrance pressure drop decrease. The observed behavior is discussed in terms of the difference in number of terephthalic acid moities in the polymer chains and in terms of oligomer plasticization.