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Rheology and interfacial properties ...

Kimerling, Abigail.

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Rheology and interfacial properties of aqueous solutions of the diblock polyelectrolyte poly(styrene-block-acrylic acid).

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	Rheology and interfacial properties of aqueous solutions of the diblock polyelectrolyte poly(styrene-block-acrylic acid)./
作者:	Kimerling, Abigail.
面頁冊數:	220 p.
附註:	Advisers: Surita R. Bhatia; Willie E. "Skip" Rochefort.
Contained By:	Dissertation Abstracts International68-03B.
標題:	Chemistry, Polymer. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3254927

Rheology and interfacial properties of aqueous solutions of the diblock polyelectrolyte poly(styrene-block-acrylic acid).
Kimerling, Abigail.

Rheology and interfacial properties of aqueous solutions of the diblock polyelectrolyte poly(styrene-block-acrylic acid). - 220 p.

Advisers: Surita R. Bhatia; Willie E. "Skip" Rochefort.

Thesis (Ph.D.)--University of Massachusetts Amherst, 2007.

In aqueous solutions diblock polyelectrolytes with amphiphilic character form aggregate structures, which affect physical properties such as viscosity, elasticity, surface tension, and film hydrophilicity. Potential applications for diblock polyelectrolyte solutions include coatings, inks, oil recovery agents, personal care products, and biomaterials. By varying the diblock polyelectrolyte and solution properties, the solutions can be tuned to meet the needs of particular applications.Subjects--Topical Terms:

1018428
Chemistry, Polymer.

Rheology and interfacial properties of aqueous solutions of the diblock polyelectrolyte poly(styrene-block-acrylic acid).
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035 $a (UMI)AAI3254927
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040 $a UMI $c UMI
100 1 $a Kimerling, Abigail. $3 1280690
245 1 0 $a Rheology and interfacial properties of aqueous solutions of the diblock polyelectrolyte poly(styrene-block-acrylic acid).
300 $a 220 p.
500 $a Advisers: Surita R. Bhatia; Willie E. "Skip" Rochefort.
500 $a Source: Dissertation Abstracts International, Volume: 68-03, Section: B, page: 1785.
502 $a Thesis (Ph.D.)--University of Massachusetts Amherst, 2007.
520 $a In aqueous solutions diblock polyelectrolytes with amphiphilic character form aggregate structures, which affect physical properties such as viscosity, elasticity, surface tension, and film hydrophilicity. Potential applications for diblock polyelectrolyte solutions include coatings, inks, oil recovery agents, personal care products, and biomaterials. By varying the diblock polyelectrolyte and solution properties, the solutions can be tuned to meet the needs of particular applications.
520 $a The research objective was to identify the influences of block length, pH, and ionic strength on the rheological and interfacial properties of poly(styrene- b-acrylic acid) (PS-PAA) solutions. Six polymers with varied PS and PAA block lengths were examined, all at 1.0 wt% in aqueous solutions. The hydrophobicity of the PS block causes the formation of spherical micelles in aqueous solutions. Increasing the solution pH ionizes the PAA block, which leads to an increase in micelle corona thickness due to repulsions between chains.
520 $a Major trends observed in the rheological and interfacial properties can be understood in terms of expected changes in the micelle size and interfacial self-assembly with pH, ionic strength, and block length. Addition of NaOH was found to increase the solution pH and initially led to increases in solution viscosity, elasticity, surface tension, and film hydrophilicity. This effect was attributed to creation of larger micelles and greater inter-micellar repulsions as the PAA chain became more fully charged. However, when the concentration of NaOH exceeded a critical value, the solution viscosity, elasticity, and film hydrophilicity decreased. It is believed this was due to charge shielding by excess sodium ions, leading to shrinkage of the micelle corona and smaller micelles. Increasing the PS-PAA solution ionic strength by adding NaCl also provided charge shielding, as observed by decreases in solution viscosity and elasticity. Increasing the length of either block led to an increase in the solution viscosity, presumably due to formation of larger micelles and hence an increased effective micellar volume fraction. The dependence of the interfacial properties on block length was less straightforward. The solution surface tension and film hydrophilicity were both found to correlate well with the ratio of styrene units to acrylic acid units.
590 $a School code: 0118.
650 4 $a Chemistry, Polymer. $3 1018428
650 4 $a Engineering, Chemical. $3 1018531
650 4 $a Engineering, Materials Science. $3 1017759
690 $a 0495
690 $a 0542
690 $a 0794
710 2 $a University of Massachusetts Amherst. $3 1019433
773 0 $t Dissertation Abstracts International $g 68-03B.
790 $a 0118
790 1 0 $a Bhatia, Surita R., $e advisor
790 1 0 $a Rochefort, Willie E. "Skip", $e advisor
791 $a Ph.D.
792 $a 2007
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3254927