M.Deylamian
مدیر بازنشسته
Synthetic Macromolecules
ماکرو مولکول های بشر ساخته
در این مقاله جداول مربوط به شناسایی ساختار اولیه پلیمر ها توسط NMR وجود دارد
Introduction
NMR is an indispensable tool to characterize synthetic macromolecules. For
synthetic macromolecules, NMR is used for several purposes; determination of composition, primary structure, conformation and crystal structure in the solid state, molecular mobility at molecular level, phase structure, imaging and so
on.
In this chapter, NMR work concerning synthetic macromolecules is
reviewed by categorizing primary structure, liquid crystal, characterization in
the solution and solid states, dynamics, gels and crosslinked, and blend.
Saxena et al.1 described recent advances of solid state 2D2 H NMR methods
to study polymer blends. The selective labeling of individual blend components allows unambiguous determination of dynamics for each component in the blend.
The 2D exchange method also provided the motional rate and the motional distributions. Macdonald2 reviewed 2H study of polyelectrolytesurfactant
interactions.
In phase separated polyelectrolyte-surfactant micelle
complexes, 2H NMR can differentiate the loosely packed complexes from the
tightly packed complexes.
This method also reveals the dynamics of thermotropic phase transition. Stilbs3 produced a review about structure and
dynamics of polymer-surfactant system based on NMR parameters such as
chemical shift, relaxation times, line width, self diffusion and so on.
Other reviews have been published about the development of NMR techniques to characterize polymers,4 dynamics of liquid crystal polymers,5,6 polymer interfaces,7 elastomer-carbon black ®ller interactions,8 monosubstituted polyacetylenes, 9 polymerization of diene.10
NMR is an indispensable tool to characterize synthetic macromolecules. For
synthetic macromolecules, NMR is used for several purposes; determination of composition, primary structure, conformation and crystal structure in the solid state, molecular mobility at molecular level, phase structure, imaging and so
on.
In this chapter, NMR work concerning synthetic macromolecules is
reviewed by categorizing primary structure, liquid crystal, characterization in
the solution and solid states, dynamics, gels and crosslinked, and blend.
Saxena et al.1 described recent advances of solid state 2D2 H NMR methods
to study polymer blends. The selective labeling of individual blend components allows unambiguous determination of dynamics for each component in the blend.
The 2D exchange method also provided the motional rate and the motional distributions. Macdonald2 reviewed 2H study of polyelectrolytesurfactant
interactions.
In phase separated polyelectrolyte-surfactant micelle
complexes, 2H NMR can differentiate the loosely packed complexes from the
tightly packed complexes.
This method also reveals the dynamics of thermotropic phase transition. Stilbs3 produced a review about structure and
dynamics of polymer-surfactant system based on NMR parameters such as
chemical shift, relaxation times, line width, self diffusion and so on.
Other reviews have been published about the development of NMR techniques to characterize polymers,4 dynamics of liquid crystal polymers,5,6 polymer interfaces,7 elastomer-carbon black ®ller interactions,8 monosubstituted polyacetylenes, 9 polymerization of diene.10
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