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Materiale Plastice
Cite as: Mater. Plast.
https://doi.org/10.37358/Mat.Plast.1964

OSIM Nr. R102356
ISSN Print 0025-5289
ISSN Online 2668-8220
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Materiale Plastice (Mater. Plast.), Year 2013, Volume 50, Issue 3,





CRISTIAN BOSCORNEA, ADELINA DAVID, LIVIA IOAN, MIRCEA TEODORESCU Effect of Additives upon the Phase Transition Temperature of a,w-(2-Hydroxyethoxy) Oligo(propylene oxide) in Aqueous Solutions


Abstract:
The influence of various additives, like salts, alkohols, surfactants and water-miscible organic solvents, upon the cloud point of a, w - (2-hydroxyethoxy) oligo(propylene oxide) in aqueous solutions was investigated for the first time. The results showed that NaH2PO4, NaCl, NaBr, NaI, 1-butanol, ethylene glycol and dimethylsulfoxide decreased the cloud point, while 1,2-propylene glycol, sodium dodecylsulfate, nonylphenyl ethoxylated with 9 moles of ethylene oxide and dioxane increased it. Addition of N,N-dimethylformamide practically had no influence upon the cloud point on the concentration interval investigated. The LCST of a, w - (2-hydroxyethoxy) oligo(propylene oxide) in aqueous solution was also determined and it was found equal to 19°C. Keywords: a, w-(2-hydroxyethoxy) oligo(propylene oxide), thermosensitive polymers, cloud point, low critical solution temperature (LCST), additives



Issue: 2013 Volume 50, Issue 3
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