Effect of poly(acrylic acid) molecular mass and end-group functionality on calcium oxalate crystal morphology and growth


Autoria(s): East, Chris P.; Wallace, Andrew D.; Al-Hamzah, Ali; Doherty, William O.S.; Fellows, Christopher M.
Data(s)

15/02/2010

Resumo

A number of series of poly(acrylic acids) (PAA) of differing end-groups and molecular mass were used to study the inhibition of calcium oxalate crystallization. The effects of the end-group on crystal speciation and morphology were significant and dramatic, with hexyl-isobutyrate end groups giving preferential formation of calcium oxalate dihydrate (COD) rather than the more stable calcium oxalate monohydrate (COM), while both more hydrophobic end-groups and less-hydrophobic end groups led predominantly to formation of the least thermodynamically stable form of calcium oxalate, calcium oxalate trihydrate. Conversely, molecular mass had little impact on calcium oxalate speciation or crystal morphology. It is probable that the observed effects are related to the rate of desorption of the PAA moiety from the crystal (lite) surfaces and that the results point to a major role for end-group as well as molecular mass in controlling desorption rate.

Identificador

http://eprints.qut.edu.au/34326/

Publicador

John Wiley & Sons, Inc

Relação

DOI:10.1002/app.31342

East, Chris P., Wallace, Andrew D., Al-Hamzah, Ali , Doherty, William O.S., & Fellows, Christopher M. (2010) Effect of poly(acrylic acid) molecular mass and end-group functionality on calcium oxalate crystal morphology and growth. Journal of Applied Polymer Science, 115(4), pp. 2127-2135.

Direitos

Copyright 2009 Wiley Periodicals, Inc.

Fonte

Chemistry; Centre for Tropical Crops and Biocommodities; Faculty of Science and Technology

Palavras-Chave #030399 Macromolecular and Materials Chemistry not elsewhere classified #039903 Industrial Chemistry #crystallization #polyelectrolytes #SEM (Scanning Electron Microscopy) #XRD (X-Ray Diffraction)
Tipo

Journal Article