The influence of different ions on the phase separation of poly (vinyl alcohol) and poly (sodium 4-styrene sulphonate) in aqueous solution. | [Journal of Chemical Society of Pakistan • 2013]

Author(s):

1. Iram Bibi: Department of Chemistry, Quaid-i-Azam University, Islamabad, Pakistan; Department of Chemistry, Hazara University Mansehra, Khyber-Pukhtoonkhwa, Pakistan

2. Khalid Mahmood: Department of Chemistry, Hazara University Mansehra, Khyber-Pukhtoonkhwa, Pakistan

3. Syed Sakhawat Shah: Department of Chemistry, Hazara University Mansehra, Khyber-Pukhtoonkhwa, Pakistan

4. Rashid Saeed: Department of Chemistry, Hazara University Mansehra, Khyber-Pukhtoonkhwa, Pakistan

5. Mohammad Siddiq: Department of Chemistry, Quaid-e-Azam University, Islamabad, Pakistan

Abstract:

In aqueous solution the phase separation behavior of mixture of PVA-PSSNa has been studied. The critical concentration at which macroscopic phase separation occur is 1.0 mol/L. The cloud point curve is typically of (lower critical solution temperature) LCST type. The driving force responsible for shifting the LCST is hydrogen bonding and hydrophobic interaction of the macromolecules. When both the polymers have close molecular weight the polymer hetero- association increases which in turn decreases the intramolecular interaction within PVA chains. Addition of Hofmeister series of salts enhances the formation of complex between PVA-PSSNa which in turn decreases the LCST of mixture of polymers. The decrease of the LCST is in the order Na2SO4 3 3

Page(s): 1496-1501

DOI: DOI not available

Published: Journal: Journal of Chemical Society of Pakistan, Volume: 35, Issue: 6, Year: 2013

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