Water-Soluble Polymers. 78. Viscosity and NRET Fluorescence Studies of pH-Responsive Twin-Tailed Associative Terpolymers Based on Acrylic Acid and Methacrylamide

2001 ◽  
Vol 34 (4) ◽  
pp. 918-924 ◽  
Author(s):  
Geoffrey L. Smith ◽  
Charles L. McCormick
Keyword(s):  
Acrylic Acid ◽  
Water Soluble ◽  
Ph Responsive ◽  
Water Soluble Polymers ◽  
Fluorescence Studies ◽  
Soluble Polymers

Luminescence studies of hydrophobically modified, water-soluble polymers. I. Fluorescence anisotropy and spectroscopic investigations of the conformational behaviour of copolymers of acrylic acid and styrene or methyl methacrylate

1995 ◽  
Vol 73 (11) ◽  
pp. 1982-1994 ◽  
Author(s):  
J.R. Ebdon ◽  
B.J. Hunt ◽  
D.M. Lucas ◽  
I. Soutar ◽  
L. Swanson ◽  
...  
Keyword(s):  
Acrylic Acid ◽  
Methyl Methacrylate ◽  
Fluorescence Anisotropy ◽  
Aqueous Media ◽  
Water Soluble ◽  
Copolymer Composition ◽  
Segmental Motion ◽  
Hydrophobic Modification ◽  
Water Soluble Polymers ◽  
Soluble Polymers

Fluorescence spectroscopy and anisotropy measurements have been used to study a series of styrene – acrylic acid, STY–AA, and methyl methacrylate – acrylic acid, MMA–AA, copolymers in dilute methanolic and aqueous solutions. Copolymerization of either STY or MMA with AA has little effect upon the rate of intramolecular segmental motion in methanol solutions. In aqueous media, intramolecular hydrophobic aggregation occurs and restricts the macromolecular dynamics to an extent dependent upon pH, nature of the comonomer, and copolymer composition. The hydrophobic domains formed in these copolymer systems can solubilize organic guests. In this respect, STY is a more powerful modifier of AA-based polymer behaviours than is MMA. In general, the hydrophobic modification increases the solubilization power of the resultant polymer. Furthermore, the copolymers retain their solubilization capacities to higher values of pH the more hydrophobic the comonomer and the greater its content in the copolymer. The interiors of the hydrophobic aggregates reduce the mobilities of occluded guests: the microviscosities of the domain interiors depend upon the nature of the hydrophobe, pH, and copolymer composition. Keywords: fluorescence, anisotropy, water-soluble polymers, acrylic acid, hydrophobic modification.

MOLECULAR DYNAMICS SIMULATION THE HYDROXYAPATITE SCALE INHIBITION MECHANISM OF WATER-SOLUBLE POLYMERS

2010 ◽  
Vol 09 (05) ◽  
pp. 889-902 ◽  
Author(s):  
SHU-GUANG ZHANG ◽  
FENG-YUN WANG ◽  
XIAO-YAO TAN
Keyword(s):  
Molecular Dynamics ◽  
Acrylic Acid ◽  
Binding Energies ◽  
Water Soluble ◽  
Polymer Chains ◽  
Dynamics Simulation ◽  
Inhibition Mechanism ◽  
Water Soluble Polymers ◽  
Soluble Polymers ◽  
Hydroxyapatite Crystal

Molecular dynamics (MD) method was used to simulate the interaction between water-soluble polymers, such as polyacrylic acid (PAA), polymethylacrylic acid (PMAA), acrylic acid-methylacrylate copolymer (AA-MAE), acrylic acid-hydroxypropyl acrylate copolymer (AA-HPA), hydrolyzed polymaleic anhydride (HPMA), acrylic acid-maleic acid copolymer (AA-MA), and hydroxyapatite crystal. The sequence of binding energies of polymers binding with the (100) crystal surface of hydroxyapatite was as follows: AA-HPA > AA-MA > HPMA > PAA > AA-MAE > PMAA. After analyzing various energy components and pair correlation functions of all systems, it could be concluded that binding energies were mainly determined by Coulomb interaction. Polymers deformed during their combining with the hydroxyapatite crystal, but all the deformation energies were far less than respective nonbond energies. The dynamics behavior of carboxyls located at different positions of the polymer chains manifested different features during the processes of MD runs. Carboxyls at the ends of the polymer chains oscillated more acutely than those in the middle of the chains; therefore, the latter ones inhibited scale crystal growth more effectively than the former ones because they combined with hydroxyapatite crystal more firmly.

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