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Synthesis of Cyclic Polymers and Characterization of Their Diffusive Motion in the Melt State at the Single Molecule Level

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Published on: September 26, 2016

Diffusion processes of single fluorescent molecules in a polymer-based thin material with three-dimensional network.

Syoji Ito¹, Takatsugu Kusumi, Satoshi Takei

¹Division of Frontiers Materials Science and Center for Quantum Science and Technology under Extreme Conditions, Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka, Japan. sito@chem.es.osaka-u.ac.jp

Chemical Communications (Cambridge, England)

|October 15, 2009

Summary

Single-molecule imaging shows polymer network formation affects guest dye mobility hierarchically. Initially, translation slows while rotation continues, with increasing crosslinking further restricting movement until both stop.

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Area of Science:

Polymer Science
Materials Science
Physical Chemistry

Background:

Polymer network formation involves crosslinking, altering material properties.
Understanding molecular mobility within polymer films is crucial for material performance.
Guest molecule dynamics can report on the evolving polymer matrix.

Purpose of the Study:

To investigate the hierarchical changes in guest dye mobility during polymer network formation.
To correlate guest dye diffusion and rotation with the degree of crosslinking.
To elucidate the distinct stages of mobility restriction in thin polymer films.

Main Methods:

Utilizing single-molecule imaging techniques.
Monitoring the translational and rotational diffusion of guest dye molecules.
Analyzing mobility changes as a function of reaction progress and crosslinking.

Main Results:

Hierarchical mobility changes observed: translational diffusion inhibited first, rotational diffusion remained active.
Fraction of translationally immobilized dyes increased with crosslinking.
At the final stage, both translational and rotational diffusion ceased.

Conclusions:

Polymer network formation progressively restricts guest molecule mobility in a hierarchical manner.
Translational mobility is more sensitive to early-stage crosslinking than rotational mobility.
Single-molecule imaging provides detailed insights into dynamic processes within forming polymer networks.