TY - JOUR
T1 - Theoretical models for grafted homopolymers in poor solvents
T2 - Observations of "dimpledrd surfaces
AU - Yeung, Chuck
AU - Huang, Kanglin
AU - Jasnow, David
AU - Balazs, Anna C.
N1 - Funding Information:
A.C.B., C.Y. and K.H. gratefully acknowledge financial support from the Department of Energy through grant DE-FG02-90ER45438, the National Science Foundation through grant number DMR-9107102 and the Dow Chemical Company. D.J. and C.Y. gratefully acknowledge financial support from the National Science Foundation through the Division of Materials Research under grant DMR89-14621.
PY - 1994/7/13
Y1 - 1994/7/13
N2 - We introduce two new methods for determining the effect of solvent quality on a layer of end-grafted homopolymers. In the first investigation, we combine the random phase approximation (RPA) with a numerical self-consistent field analysis to examine the structure of the grafted layer. For sufficiently poor solvents, the laterally homogeneous grafted layer is linearly unstable to fluctuations tangential to the grafting plane. In the unstable regime, the grafted layer forms a "dimpled" surface in which the depth of, and the distance between, the dimples depend on chain length, solvent quality and grafting density. We also developed a two-dimensional self-consistent field model for grafted chains. The model allows us to explicitly calculate the density profiles for the grafted layer. These profiles clearly reveal the dimpled surface. Both methods are sufficiently general to be useful in examining a variety of problems involving polymers at interfaces.
AB - We introduce two new methods for determining the effect of solvent quality on a layer of end-grafted homopolymers. In the first investigation, we combine the random phase approximation (RPA) with a numerical self-consistent field analysis to examine the structure of the grafted layer. For sufficiently poor solvents, the laterally homogeneous grafted layer is linearly unstable to fluctuations tangential to the grafting plane. In the unstable regime, the grafted layer forms a "dimpled" surface in which the depth of, and the distance between, the dimples depend on chain length, solvent quality and grafting density. We also developed a two-dimensional self-consistent field model for grafted chains. The model allows us to explicitly calculate the density profiles for the grafted layer. These profiles clearly reveal the dimpled surface. Both methods are sufficiently general to be useful in examining a variety of problems involving polymers at interfaces.
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U2 - 10.1016/0927-7757(93)02715-Q
DO - 10.1016/0927-7757(93)02715-Q
M3 - Article
AN - SCOPUS:0028465937
SN - 0927-7757
VL - 86
SP - 111
EP - 123
JO - Colloids and Surfaces A: Physicochemical and Engineering Aspects
JF - Colloids and Surfaces A: Physicochemical and Engineering Aspects
IS - C
ER -