Macromolecules
Macromolecules
5 years ago

Probing the Utmost Distance of Polymer Dynamics Suppression by a Substrate by Investigating the Diffusion of Fluorinated Tracer-Labeled Polymer Chains

Probing the Utmost Distance of Polymer Dynamics Suppression by a Substrate by Investigating the Diffusion of Fluorinated Tracer-Labeled Polymer Chains
Li Zhang, Yongming Hong, Biao Zuo, Xinping Wang, Yizhi Zhang, Hao Zhou, Jianquan Xu
A facile method was developed to measure the utmost distance of polymer dynamics suppressed by a solid substrate by investigating the diffusion of a fluorinated tracer-labeled polymer in the bottom layer of bilayer samples. Here, a labeled layer of fluorinated tracer-labeled at the polymer chain end of variable thickness was supported on a substrate, and the corresponding homopolymer layer of fixed thickness was deposited on top of the bottom layer. From the critical time (t*) required for the fluorinated component to diffuse from the bottom layer to the bilayer film surface as a function of the thickness of the bottom layer, a critical thickness of the bottom layer (hc*), corresponding to the thickness at which t* started to increase, was obtained. This thickness was related to the distance over which polymer dynamics were altered by the substrate. The results showed that hc* was very sensitive to the surface chemistry of the substrate and exhibited both molecular weight and temperature dependencies.

Publisher URL: http://dx.doi.org/10.1021/acs.macromol.7b01158

DOI: 10.1021/acs.macromol.7b01158

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