6533b85bfe1ef96bd12bbd02
RESEARCH PRODUCT
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Rolf C. SchulzSarkyt E. KudaibergenovJoachim ZöllerVera A. FrolovaEsen A. Bekturovsubject
Poly(methacrylic acid)chemistry.chemical_compoundAqueous solutionMethacrylic acidChemistryPotentiometric titrationPolymer chemistrymedicineCationic polymerizationChlorideDissociation (chemistry)Polyelectrolytemedicine.drugdescription
It is shown that the block-like structure of the polyampholyte poly(methacrylic acid)-block-poly(1-methyl-4-vinylpyridinium chloride) considerably influences its conformational behaviour. This specific behaviour is explained by the formation of intra-macromolecular polyelectrolyte complexes stabilized by cooperative ionic contacts between acidic and basic units near the isoelectric point (i. e. p.). The structure of the block-polyampholyte at the i. e. p. is suggested to be close to the structure of non-stoichiometric polyelectrolyte complexes. The complex formation ability of the block-polyampholyte with respect to anionic, cationic, and nonionic polymers is also studied. By means of potentiometric, conductometric, and viscometric methods the composition of interpolymer complexes is determined and the degree of conversion in complex formation reactions is calculated. The water solubility (or insolubility) of interpolymer complexes is determined by the length of acid or basic blocks. It is proposed that a dissociation of interpolymer complexes into their individual components takes place at the i. e. p. of the block-polyampholyte.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 1990-02-01 | Die Makromolekulare Chemie |