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Synthesis of Double-Hydrophilic Block Copolymers with Hydrophobic Moieties for the Controlled Crystallization of Minerals

Synthesis of Double-Hydrophilic Block Copolymers with Hydrophobic Moieties for the Controlled Crystallization of Minerals

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SEDLÁK, Miloš, Helmut CÖLFEN, 2001. Synthesis of Double-Hydrophilic Block Copolymers with Hydrophobic Moieties for the Controlled Crystallization of Minerals. In: Macromolecular Chemistry and Physics. 202(4), pp. 587-597. ISSN 1022-1352. eISSN 1521-3935. Available under: doi: 10.1002/1521-3935(20010201)202:4<587::AID-MACP587>3.0.CO;2-F

@article{Sedlak2001-02-01Synth-40378, title={Synthesis of Double-Hydrophilic Block Copolymers with Hydrophobic Moieties for the Controlled Crystallization of Minerals}, year={2001}, doi={10.1002/1521-3935(20010201)202:4<587::AID-MACP587>3.0.CO;2-F}, number={4}, volume={202}, issn={1022-1352}, journal={Macromolecular Chemistry and Physics}, pages={587--597}, author={Sedlák, Miloš and Cölfen, Helmut} }

Sedlák, Miloš Cölfen, Helmut 2017-10-18T09:35:19Z A set of double hydrophilic block copolymers was synthesized on the basis of a branched poly(ethylene glycol)-block-poly(ethyleneimine) (PEG-b-PEI) block copolymer by polymer analogous reactions. Different hydrophobic moieties were successfully introduced as well as carboxylate, phosphonate, sulfonate and thiol groups leading to a library of only partially differing block copolymers. The analysis of the block copolymers by GPC turned out to be extremely difficult, as the multifunctional polymers tend to interact with various column materials. However, characterization of PEG-b-PEI was possible with <sup>1</sup>H NMR and analytical ultracentrifugation as well as with elemental analysis. These techniques revealed a significant amount of unbound PEG due to side reactions with PEI monomers or oligomers. The degree of the various functionalizations of PEG-b-PEI was determined by elemental analysis indicating that the sterically big phosphonic or sulfonic acid groups are only attached to the primary amino groups of the PEI block whereas the smaller thiol and carboxy groups can additionally be bound to secondary amino groups. The set of polymers was applied as additive in the crystallization of CaCO<sub>3</sub> yielding microparticles in all cases. Under the basic conditions of the experiment (pH > 8.5), both hydrophobically modified and unmodified polymers show almost the same influence on the CaCO<sub>3</sub> morphology, whereas the stabilization of the formed microparticles varies. However, the kind of functional group has a strong influence, with phosphonate and sulfonate as the substituents leading to the most significant changes in the CaCO<sub>3</sub> morphology. eng Synthesis of Double-Hydrophilic Block Copolymers with Hydrophobic Moieties for the Controlled Crystallization of Minerals 2001-02-01 2017-10-18T09:35:19Z Sedlák, Miloš Cölfen, Helmut

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