Structural changes in aqueous solutions of poly(acrylic acid) and poly(methacrylic acid) in the crossover regionстатья
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Дата последнего поиска статьи во внешних источниках: 28 мая 2015 г.
Аннотация:Aqueous-saline solutions of poly(acrylic acid) (M w = 1.4 × 10 5) and poly(methacrylic acid) (M w = 3.1 × 10 5) were studied by phonon correlation spectroscopy and viscometry over a wide concentration range at their own pH values (≈2-3). As was found, a transition from dilute to semidilute solutions (crossover) is accompanied by the formation of the network of entanglements between macromolecules. In solutions of poly(methacrylic acid), the transition to the region of semidilute solutions is preceded by the formation of stable clusters of macromolecules which is not observed in poly(acrylic acid) solutions.