ISSN:
1435-1536
Keywords:
Key words Dissolution
;
Molecular weights
;
Ionic strength
;
Neutralisation
;
Light scattering
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
,
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Abstract The dissolution behaviour of model alkali-soluble polymer emulsions with different molecular weights was studied using conductometric and potentiometric titration and laser light scattering techniques. The behaviour of the copolymer was studied as a function of the degree of neutralisation, α = [NaOH]/[COOH]. The polymer latex swells with increasing α values up to α = 0.5–0.7, after which the dissociation of polymer chains commences. At α = 1.0, all the polymer latexes dissociate into individual polymer chains. By combining the results of static and dynamic laser light scattering, we observed that the polymers have a compact conformation at α = 0. This compact conformation changes to a random coil at around α = 0.5, which then becomes a fully extended coiled conformation at α = 1.0, when all the COOH polymer groups are hydrolysed. The dissolution of low-molecular-weight polymers is faster than that of high-molecular-weight polymers.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/s003960050506
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