Abstract
The effects of preferential solvation of monomers by polymer coils in homogeneous radical copolymerization at low conversion (5–7%) have been studied for styrene-acrylonitrile, styrenemethacrylic acid, styrene-acrylamide, styrene-acrylic acid, styrene-butyl methacrylate, vinyl acetate-2-methyl-5-vinyl-pyridine and vinyl acetate-2-vinyl pyridine. In the simplest cases, the copolymer composition and microstructure can be described by the Mayo-Lewis model with the apparent or effective monomer reactivity ratios: r 2 = r 2 0γ, r 1 = r 1 0 γ , where r 1 0, r 2 0 are ideal reactivity ratios defined by the monomer structure, γ is the monomer distribution coefficient. The most fundamental effect of preferential solvation is the relation between the copolymer composition and molecular weight caused by the dependence of preferential solvation coefficient γ upon the length of a growing chain. This dependence leads to two previously unknown types of chemical heterogeneity of low-conversion copolymers, viz. intra- and intermolecular gradient chemical heterogeneity.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
