Study of water soluble polyelectrolyte complexes of nonequimolar compositionстатья
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Дата последнего поиска статьи во внешних источниках: 28 мая 2015 г.
Авторы:
Izumrudov V.A. ,
Kasaikin V.A. ,
Yermakova L.N. ,
Zezin A.B.
Журнал:
Polymer Science U.S.S.R.
Том:
20
Номер:
2
Год издания:
1978
Издательство:
Elsevier B.V.
Местоположение издательства:
Netherlands
Первая страница:
452
Последняя страница:
460
Аннотация:
A study has been made of the properties of polyelectrolyte complexes (PEC) of nonequimolar composition as exemplified by those formed by poly(N-ethyl-4-vinyl-pyridinium bromide) (PVP C 2H 5Br) and polymethacrylic acid (PMAA) in acid media. It has been found that such PEC have a property in common in that they dissolve in neutral and weakly basic media, whereas simple mixing of polyelectrolytes in any ratios at pH at which both polymer components are completely charged (pH ≈ 7) leads only to formation of equimolar PEC that are insoluble in water. The dissolution of PEC is observed over a sufficiently wide composition range 2·5 < PVPB:PMMA < 5, and does not involve dissociation of PEC into components. The mechanism of formation of water-soluble polycomplexes is considered, and a model of such polycomplexes is suggested. © 1978.
Добавил в систему:
Изумрудов Владимир Алексеевич