temperature Effect on solution properties of Interpolymer complexes based on poly(Acrylic Acid) and some cellulose ethers
A.V. Dubolazov1, Z.S. Nurkeeva1, G.A. Mun1, D.M. Lukmanova1, V.V. Khutoryanskiy2
1Department of Chemical Physics
& Macromolecular Chemistry,
2School of Pharmacy and Pharmaceutical Sciences, University of Manchester, Coupland III, Coupland Street, M13 9PL, Manchester, United Kingdom
In the present study the effect of temperature on aggregation/dissociation and solution behaviour of interpolymer complexes of poly(acrylic acid) with hydroxypropylcellulose and hydroxyethylcellulose has been investigated in aqueous solutions by turbidimetric and viscometric methods. Formation of polycomplexes with different structures was achieved by adjusting the solution pH. It was shown that an increase in temperature promotes the aggregation of polycomplexes based on poly(acrylic acid) and hydroxypropylcellulose but leads to a partial dissociation of polycomplexes based on poly(acrylic acid) and hydroxyethylcellulose. It was observed that the temperature increase leads to the conformational transition of poly(acrylic acid) - hydroxypropylcellulose hydrophilic associates into a compact form insoluble in water. The fundamental information about the stability of interpolymer complexes at higher temperatures obtained in the present work may be useful for the design of intelligent materials, which undergo temperature-induced phase transitions.