TY - JOUR
T1 - Mechanical behavior of temperature-sensitive gels under equilibrium and transient swelling
AU - Drozdov, A. D.
PY - 2018/7/1
Y1 - 2018/7/1
N2 -
Water uptake by a thermo-responsive gel is strongly affected by temperature: the gel swells below its volume phase transition temperature T
c
and shrinks above T
c
. Observations reveal two types of equilibrium swelling diagrams: discontinuous (with degree of swelling Q falling abruptly at T
c
) and continuous (with Q decreasing smoothly with temperature). A constitutive model is developed for the mechanical behavior of a temperature-sensitive gel subjected to swelling that accounts for changes in its structure (phase separation) at T
c
. Adjustable parameters are found by fitting experimental data in equilibrium swelling tests, transient deswelling–reswelling tests, and tensile-compressive tests on poly(N, N-diethylacrylamide) gel with a continuous equilibrium swelling curve and poly(N−n-propylacrylamide) gel with a discontinuous diagram. Numerical simulation demonstrates qualitatively different responses of gels with discontinuous and continuous swelling diagrams.
AB -
Water uptake by a thermo-responsive gel is strongly affected by temperature: the gel swells below its volume phase transition temperature T
c
and shrinks above T
c
. Observations reveal two types of equilibrium swelling diagrams: discontinuous (with degree of swelling Q falling abruptly at T
c
) and continuous (with Q decreasing smoothly with temperature). A constitutive model is developed for the mechanical behavior of a temperature-sensitive gel subjected to swelling that accounts for changes in its structure (phase separation) at T
c
. Adjustable parameters are found by fitting experimental data in equilibrium swelling tests, transient deswelling–reswelling tests, and tensile-compressive tests on poly(N, N-diethylacrylamide) gel with a continuous equilibrium swelling curve and poly(N−n-propylacrylamide) gel with a discontinuous diagram. Numerical simulation demonstrates qualitatively different responses of gels with discontinuous and continuous swelling diagrams.
KW - Constitutive modeling
KW - Hydrophobic association
KW - Temperature-responsive gel
KW - Volume phase transition
UR - http://www.scopus.com/inward/record.url?scp=85044463833&partnerID=8YFLogxK
U2 - 10.1016/j.ijengsci.2018.03.009
DO - 10.1016/j.ijengsci.2018.03.009
M3 - Journal article
AN - SCOPUS:85044463833
SN - 0020-7225
VL - 128
SP - 79
EP - 100
JO - International Journal of Engineering Science
JF - International Journal of Engineering Science
ER -