Local and global dynamics of transient polymer networks and swollen gels anchored on solid surfaces

被引:36
作者
Gianneli, M.
Beines, P. W.
Roskamp, R. F.
Koynov, K.
Fytas, G.
Knoll, W.
机构
[1] Max Planck Inst Polymer Res, D-55128 Mainz, Germany
[2] Univ Crete, Dept Mat Sci & Technol, FORTH, GR-71110 Iraklion, Greece
关键词
D O I
10.1021/jp0728959
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
We employ fluorescence correlation spectroscopy to study length dependent dynamics in transient and grafted cross-linked poly(N-isopropylacrylamide) (PNIPAAm) networks at different concentrations and cross-link densities, respectively. For nondilute PNIPAAm solutions, the molecular diffusants appear to sense local dynamic; on the length scale of the mesh size obtained from photon correlation spectroscopy, whereas a polymer probe, comparable to the PNIPAAm size, reveals global chain motions. The relation of the tracer Brownian diffusion to the mesh size can be utilized to characterize permanently cross-linked and grafted PNIPAAm networks.
引用
收藏
页码:13205 / 13211
页数:7
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