Browsing by Author "BASELGA, J"
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- ItemCOMPLEXATION OF POLY(MONOBENZYL ITACONATE) AND POLY(N-VINYL-2-PYRROLIDONE) IN DILUTE-SOLUTION(1989) PEREZDORADO, A; PIEROLA, IF; BASELGA, J; GARGALLO, L; RADIC, D
- ItemCOMPLEXATION OF POLY(MONOBENZYL ITACONATE) AND POLY(N-VINYL-2-PYRROLIDONE) IN DILUTE-SOLUTION .2. INFLUENCE OF VARIABLES INVOLVED IN SAMPLE PREPARATION(1990) PEREZDORADO, A; PIEROLA, IF; BASELGA, J; GARGALLO, L; RADIC, DUpon mixing dilute solutions of poly(monobenzyl itaconate)c) (PMBI) and poly(N-vinyl-2-pyrrolidone) (PVP) in methanol, a soluble interpolymer complex is formed whose properties depend on the method employed to prepared the sample. It was found that the local concentration of the polyacid is the controlling factor. Depending on that concentration, a metastable polymer complex is formed which turns to equilibrium upon sonication. Cooling or heating and aging time have a minor effect. The turbidity of the polymer complex depends on the polyacid concentration to the power-nu (at constant polybase/polyacid ratio). For the metastable complex, nu-almost-equal-to 2, typical of weak polymer complexes. Changes in turbidity are accompanied by a decrease in nu. In the equilibrium state, nu almost-equal-to 1,5 a value being more typical of strong complexes.