Principal Investigator&
Deputy Director, Changchun Institute of Applied Chemistry
Tel: +86-431-
Fax: +86-431-
E-mail: ljan@
Kinetics of surface phase separation for PMMA/SAN thin film studied
by in situ atomic force microscopy,
Macromolecules,
2005, 38(1): 211
Phase separation
in polymer film is very important to many applications ranging from
biomedical to microelectronic device fabrication. Although there are
many experiments focusing on the kinetics of phase separation in polymer
film, surface phase separation is not well investigated, especially its
kinetics, which is important to control the surface structure and
properties. In addition, most of researches on this topic employ ex
situ technology, which may face some problems to describe the real
kinetics. Therefore, we employ the in situ AFM to investigate its
real kinetics in polymer film. In this work, the temporal evolution
pattern of surface phase separation and its coalescence process for PMMA/SAN
blend thin films have been observed using this technique in real space
directly. From the power law, two distinct regimes are found after the thin films abruptly jumped to
an unstable state. The early stage probably is dominated by one
component’s diffusion to the surface, and the restriction of the surface
geometry to chain mobility, resulting in much slower kinetics than those
obtained from literature while the late stage obeyed the
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