Wang, Jia-Yu and Chen, Wei and Russell, Thomas P.. (2008) Ion-Complexation-Induced Changes in the Interaction Parameter and the Chain Conformation of PS-b-PMMA Copolymers. Macromolecules, 41 (13). pp. 4904-4907. ISSN 0024-9297Full text not available from this repository. (Request a copy)
Small-angle neutron scattering (SANS) was used to study the changes of segmental interactions and chain conformation due to the formation of lithium−PMMA complexes in polystyrene-block-poly(methyl methacrylate) (PS-b-PMMA) copolymers as a function of temperature and the percentage of carbonyl groups coordinated with lithium ions. χeffc and statistical segmental length, σ, are derived from the SANS profiles of the copolymers with lithium−PMMA complexes in a disordered state by use of the correlation-hole scattering formalism described by Leibler. Fitting results show that both χeffc and σ of PS and PMMA increase as the formation of lithium−PMMA complexes in PS-b-PMMA copolymers, and the degree of such increase depends on the concentration of lithium−PMMA complexes. In addition, χeffc of the lithium-complexed PS-b-PMMA becomes less temperature-dependent due to the increase in χs and decrease in χH.
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