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A study of pyridinium‐type functional polymers. I. Preparation and characterization of soluble pyridinium‐type functional polymers
Author(s) -
Li Guangji,
Shen Jiarui,
Zhu Yinlan
Publication year - 1996
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/(sici)1097-4628(19961226)62:13<2247::aid-app9>3.0.co;2-j
Subject(s) - pyridinium , chemistry , copolymer , titration , polymer , polymer chemistry , solvent , polyelectrolyte , bromide , organic chemistry
Abstract Copolymerization of 4‐vinylpyridine (4VP) with styrene (St) was performed in ethanol using 2,2′‐azobisisobutyronitrile (AIBN) as an initiator, and then a random copolymer P(4VP–St) was obtained. A soluble pyridinium‐type polymer containing N ‐benzyl‐4‐vinylpyridinium bromide [Q‐P(4VP–St)], was prepared by quaternization of P(4VP–St) with benzyl bromide (BzBr). The structures of P(4VP–St) and its quaternized product Q‐P(4VP–St) were identified by FTIR. The 4VP content in P(4VP–St) and the pyridinium group content ( C q ) in Q‐P(4VP–St) were determined by nonaqueous titration and argentometry, respectively. The molecular weight of p(4VP–St) was characterized by intrinsic viscosity. In addition, the charge density σ of the soluble pyridinium‐type polymers was measured by colloid titration, and the mathematical relation between σ and C q was established as follows: σ = −0.090 + 0.942 C q . A preliminary investigation was made into the viscosity behavior and electroconductivity of the Q‐P(4VP–St)/polar solvent system. © 1996 John Wiley & Sons, Inc.