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Solution rheology and microstructure...

Abdala, Ahmed A.

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Solution rheology and microstructure of associative polymers.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Solution rheology and microstructure of associative polymers./
Author:	Abdala, Ahmed A.
Description:	219 p.
Notes:	Source: Dissertation Abstracts International, Volume: 64-11, Section: B, page: 5630.
Contained By:	Dissertation Abstracts International64-11B.
Subject:	Engineering, Chemical. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3112792
ISBN:	0496602886

Solution rheology and microstructure of associative polymers.
Abdala, Ahmed A.

Solution rheology and microstructure of associative polymers. - 219 p.

Source: Dissertation Abstracts International, Volume: 64-11, Section: B, page: 5630.

Thesis (Ph.D.)--North Carolina State University, 2003.

This study focuses on understanding the structure-property relationship for hydrophobically modified alkali soluble emulsion (HASE) polymers with emphasis on their microstructure and rheological properties.

ISBN: 0496602886Subjects--Topical Terms:

1018531
Engineering, Chemical.

Solution rheology and microstructure of associative polymers.
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008 130614s2003 eng d
020 $a 0496602886
035 $a (UnM)AAI3112792
035 $a AAI3112792
040 $a UnM $c UnM
100 1 $a Abdala, Ahmed A. $3 1925714
245 1 0 $a Solution rheology and microstructure of associative polymers.
300 $a 219 p.
500 $a Source: Dissertation Abstracts International, Volume: 64-11, Section: B, page: 5630.
500 $a Co-Chairmen: Alan E. Tonelli; Saad A. Khan.
502 $a Thesis (Ph.D.)--North Carolina State University, 2003.
520 $a This study focuses on understanding the structure-property relationship for hydrophobically modified alkali soluble emulsion (HASE) polymers with emphasis on their microstructure and rheological properties.
520 $a In the first part of this study, we investigate the effects of the concentrations of methacrylic acid (MAA) and macromonomers on the solution rheology. We find that polymers with low MAA content have smaller hydrodynamic size and weaker network structures compared to larger hydrodynamic size and stronger network structures for polymers with high MAA content. However, due to chain-increased stiffness at higher MAA and lower contribution from the aggregation of ethyl-acrylate groups, a broad maximum in the viscoelastic properties of the polymer solution is observed at about 40--50 mole% MAA.
520 $a In the second part of this study, co-solvents of water and propylene glycol (PG) in different proportions are used to investigate the effect of the solvent quality. The steady and dynamic properties show the presence of two regimes with respect to solvent composition. In "water-rich" solvents, the hydrophobic associations dominate the solution rheology. In contrast, in "PG-rich" solvents, the hydrophobic associations are suppressed due to lower tendency of the hydrophobes to aggregate, smaller coil size and changes in the PEO conformations. These different types of behavior are discussed and confirmed by different concentration dependences in each regime.
520 $a In the third part of the study, we find that diffusing wave spectroscopy (DWS) accurately probes the structural changes induced by the change in the solvent quality and polymer concentration. Moreover, comparison with conventional rheometry data reveals excellent qualitative agreement. The scaling of the creep compliance, elastic modulus and relaxation time with polymer concentration shows power-law dependences.
520 $a An approach to modulate the hydrophobic association is presented in the last part of the study. The encapsulation of the hydrophobic groups with inclusion compound forming hosts (alpha- or beta-cyclodextrin) leads to significant reduction in solution viscosity and viscoelastic properties On the other hand, addition of surfactants reactivate the hydrophobic groups and thus recover the solution rheological properties.
590 $a School code: 0155.
650 4 $a Engineering, Chemical. $3 1018531
650 4 $a Chemistry, Polymer. $3 1018428
690 $a 0542
690 $a 0495
710 2 0 $a North Carolina State University. $3 1018772
773 0 $t Dissertation Abstracts International $g 64-11B.
790 1 0 $a Tonelli, Alan E., $e advisor
790 1 0 $a Khan, Saad A., $e advisor
790 $a 0155
791 $a Ph.D.
792 $a 2003
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3112792