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Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives

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Cyclodextrins modify the properties of cationic polyacrylamides.

Ying Wang¹, Sujit Banerjee

¹Institute of Paper Science and Technology, School of Chemical & Biomolecular Engineering, Georgia Institute of Technology, 500 Tenth Street NW, Atlanta, GA 30332-0620, United States.

Journal of Colloid and Interface Science

|September 4, 2009

Summary

Beta-cyclodextrin (beta-CD) significantly alters cationic polyacrylamide (c-PAM) size in water, enhancing its ability to flocculate wood pulp fibers for improved dewatering applications.

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Published on: September 26, 2016

Area of Science:

Polymer Science
Colloid and Surface Chemistry
Water Treatment Technologies

Background:

Cationic polyacrylamides (c-PAM) are widely used as flocculants in water treatment and sludge dewatering.
The behavior of c-PAM in aqueous solutions is sensitive to environmental factors, including the presence of additives.
Understanding polymer-additive interactions is crucial for optimizing flocculation processes.

Purpose of the Study:

To investigate the effect of beta-cyclodextrin (beta-CD) on the hydrodynamic diameter (D(h)) of c-PAM in water.
To elucidate the mechanism by which beta-CD influences c-PAM conformation and aggregation.
To evaluate the impact of beta-CD-c-PAM interactions on the flocculation of wood pulp fibers.

Main Methods:

Dynamic Light Scattering (DLS) to measure the hydrodynamic diameter (D(h)) of c-PAM.
Turbidity measurements to assess the efficiency of c-PAM in flocculating wood pulp fibers.
Varying concentrations of beta-CD and c-PAM to study interaction effects.

Main Results:

Beta-cyclodextrin (beta-CD) addition caused a significant decrease or increase in the hydrodynamic diameter (D(h)) of cationic polyacrylamide (c-PAM).
Beta-CD was found to enhance c-PAM-induced flocculation of wood pulp fibers, correlating with reduced D(h) of c-PAM.
The most effective CD-polymer combinations for fiber flocculation corresponded to the greatest reduction in c-PAM's D(h).

Conclusions:

Beta-cyclodextrin interacts with cationic polyacrylamide, potentially by dispersing polymer charges, leading to altered polymer associations.
Beta-CD enhances the flocculation of wood pulp fibers by c-PAM, suggesting improved performance in applications like sludge dewatering.
The compaction of c-PAM by beta-CD results in a more tightly packed fiber network and improved floc characteristics.