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Open AccessArticle

Upper Critical Solution Temperature (UCST) Behavior of Polystyrene-Based Polyampholytes in Aqueous Solution

Department of Applied Chemistry, Graduate School of Engineering, University of Hyogo, 2167 Shosha, Himeji, Hyogo 671-2280, Japan
Tosoh Finechem Co., 4988 Kaisei-cho, Shunan, Yamaguchi 746-0006, Japan
Author to whom correspondence should be addressed.
Polymers 2019, 11(2), 265;
Received: 15 December 2018 / Revised: 22 January 2019 / Accepted: 2 February 2019 / Published: 4 February 2019
Strong polyampholytes comprising cationic vinylbenzyl trimethylammonium chloride (VBTAC) bearing a pendant quaternary ammonium group and anionic sodium p-styrenesulfonate (NaSS) bearing a pendant sulfonate group were prepared via reversible addition-fragmentation chain-transfer polymerization. The resultant polymers are labelled P(VBTAC/NaSS)n, where n indicates the degree of polymerization (n = 20 or 97). The percentage VBTAC content in P(VBTAC/NaSS)n is always about 50 mol%, as revealed by 1H NMR measurements, meaning that P(VBTAC/NaSS)n is a close to stoichiometrically charge-neutralized polymer. Although P(VBTAC/NaSS)n cannot dissolve in pure water at room temperature, the addition of NaCl or heating solubilizes the polymers. Furthermore, P(VBTAC/NaSS)n exhibits upper critical solution temperature (UCST) behavior in aqueous NaCl solutions. The UCST is shifted to higher temperatures by increasing the polymer concentration and molecular weight, and by decreasing the NaCl concentration. The UCST behavior was measured ranging the polymer concentrations from 0.5 to 5.0 g/L. View Full-Text
Keywords: polyampholyte; UCST; RAFT; electrostatic interaction polyampholyte; UCST; RAFT; electrostatic interaction
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MDPI and ACS Style

Kanta Sharker, K.; Ohara, Y.; Shigeta, Y.; Ozoe, S.; Yusa, S.-I. Upper Critical Solution Temperature (UCST) Behavior of Polystyrene-Based Polyampholytes in Aqueous Solution. Polymers 2019, 11, 265.

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