Behaviour of crosslinked and linear poly[1-(3-sulphopropyl)-2-vinyl-pyridinium-betaine] in aqueous salt solutions
✍ Scribed by Xue, Wei; Huglin, Malcolm B; Khoshdel, Ezat
- Publisher
- John Wiley and Sons
- Year
- 1999
- Tongue
- English
- Weight
- 233 KB
- Volume
- 48
- Category
- Article
- ISSN
- 0959-8103
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✦ Synopsis
Linear and crosslinked poly [ 1-(3-sulphopropyl)-2-vinyl-pyridinium-betaine ] (PSPV) samples have been prepared by free radical polymerization of the zwitterionic monomer (SPV) in the absence and presence, respectively, of N,Nº-methylene-bisacrylamide (MBA). The crosslinked xerogel was swollen to equilibrium at ambient temperature in water and in aqueous solutions of KSCN, KBr and KCl having concentrations ( [ salt ] ) extending up to 2 mol dm-3. In aqueous salt the degree of swelling exceeded the value in pure water (0.70), the enhancement in swelling being most marked at low values of [ salt ] . The content of water within hydrogel increased with salt concentration in swelling medium for low values of [ salt ] but thereafter fell with further increase in [ salt ] . In contrast, the salt content within swollen hydrogel displayed a continuous increase with increasing [ salt ] . The partition coefficient expressing concentration of salt in hydrogel relative to that in swelling medium increased sharply with [ salt ] at low values, but levelled out to values of 0.8-1.2 at higher values of [ salt ] . The diþ erence in behaviour among the three salts was not dramatic, but indicated that the affinity of salt for the polymer lay generally in the order KSCN > KBr > KCl. This affinity was conürmed by conductometric determinations of the coefficient of selective adsorption of salt to polymer in solutions of linear PSPV.