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Evidence of shear‐induced polymer release from a swollen gel particle
Author(s) -
Vervoort Sylvie,
Budtova Tatiana
Publication year - 2003
Publication title -
polymer international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.592
H-Index - 105
eISSN - 1097-0126
pISSN - 0959-8103
DOI - 10.1002/pi.1131
Subject(s) - materials science , particle (ecology) , shear flow , polymer , shear (geology) , composite material , particle size , aqueous solution , polyelectrolyte , shear rate , shear stress , deformation (meteorology) , simple shear , chemical engineering , polymer chemistry , rheology , chemistry , mechanics , organic chemistry , physics , oceanography , engineering , geology
The influence of simple shear flow on the behaviour of an isolated polyelectrolyte hydrogel particle swollen in an aqueous hydroxypropylcellulose solution was studied by rheo‐optics. When submitted to a constant shear stress, an initially spherical particle deforms quickly to adopt a stable ellipsoidal form. Upon reaching a first stress threshold, some liquid is released from the particle. This liquid release is determined by a critical deformation value above which the gel cannot retain all of its solvent. At stresses above a second threshold value, small droplets of liquid are secreted from the particle and move away in the flow direction. © 2003 Society of Chemical Industry