New approaches to molecular heterogeneity analysis of associating copolymers based on acrylamide

作者：Blagodatskikh IV^*; Vasil'eva OV; Pryakhina TA; Churochkina NA; Smirnov VA; Filippova OE; Khokhlov AR

来源：Polymer Science - Series B, 2004, 46(1-2): 14-22.

A comprehensive approach to analysis of molecular mass heterogeneity of strongly associating hydrophobically modified charged terpolymers based on acrylamide was developed. The use of a cosolvent (acetonitrile) allows the onset of hydrophobic aggregation to be shifted to concentrations corresponding to a transition to the region of semidilute solutions of the parent poly (acrylamide). The dissolution of hydrophobic aggregates is monitored by fluorescence spectroscopy using pyrene as a probe and dynamic light scattering. The absolute values of M-w were measured by static light scattering in mixed solvents, and molecular mass distribution was estimated by gel permeation chromatography with calibration relative to hydrophobically modified poly(acrylamide) samples whose molecular masses were estimated by light scattering or gel permeation chromatography with a light scattering detector. An evolution of the molecular mass characteristics of terpolymers in the course of micellar acrylamide copolymerization with N-nonyl acrylamide and sodium acrylate was investicyated. It was shown that the molecular heterogeneity enhances with conversion due to accumulation of a low-molecular-mass fraction.

• 出版日期2004-2