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Characterization of the rheological behavior of UHMWPE gels using parallel plate rheometry
Author(s) -
Chiu HsienTang,
Wang JyhHorng
Publication year - 1998
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/(sici)1097-4628(19981031)70:5<1009::aid-app22>3.0.co;2-1
Subject(s) - rheometry , rheology , materials science , composite material , spinning , shear rate , strain rate , polyethylene , gel point , dynamic mechanical analysis , shear modulus , shear stress , shear flow , shear (geology) , polymer chemistry , polymer , thermodynamics , physics
The effects of shear flow, temperature, and gel concentration on the rheological behavior of the ultrahigh‐molecular‐weight polyethylene (UHMWPE) gel in gel spinning process were investigated. The gel point was determined using parallel plate rheometry in rotation mode with controlled stress. Likewise, the flow curves at various temperatures were determined with controlled shear rate from 10 −2 to 10 s −1 . Whereas the shear storage modulus ( G ′) was obtained in oscillation mode with controlled strain from 1 to 100%. The result shows that the gel point of the UHMWPE gel increases with increasing gel concentration. The result from the strain sweep indicates that G ′ of the gel is 1.5 × 10 3 Pa, and it exhibits a plateau at low strain, but it is reduced with increasing strain. At low shear rates, for temperatures above gel point, all flow curves exhibit a plateau, then go down with increasing shear rate. Studying contributions from UHMWPE gel concentration, temperature, and shear rate for rheological view, we found that spinning at 6% UHMWPE (MW : 1.4 × 10 6 g/mol) gel and 140°C gives the best effect on formation of fiber structure. © 1998 John Wiley & Sons, Inc. J. Appl. Polym. Sci. 70: 1009–1016, 1998