Home > Search Results: Cifra, Peter
Search:
Search Tips :: Advanced Search
Search collections:
Sort by: Display results: Output format:
National Repository of Grey Literature 2 records found  Search took 0.01 seconds. 
Conformational behavior of branched polymers
 Wang, Xiu ; Limpouchová, Zuzana (advisor) ; Cifra, Peter (referee) ; Kolafa, Jiří (referee)
This PhD thesis is devoted to the study of the conformational behavior of branched polymers in confined volumes. This behavior depends not only on polymer architecture and composition but also on steric confinement and on interaction of polymer segments with the confining wall. Better understanding of complex entropy-to-enthalpy interplay can elucidate the mechanism of the chromatographic separation at the microscopic level. An unambiguous size-exclusion chromatography (SEC) analysis of mixtures containing different polymer architectures is difficult because the sizes of polymer coils, which determine the separation, depend not only on molar mass but also on the polymer architecture. Modern chromatographic methods combine the SEC with the interaction chromatography (IC). They exploit the fact that polymer interactions with pore walls, which are the prerequisite for efficient IC separation, depend strongly on polymer architecture. The knowledge of the conformational behavior of linear and branched polymers in confined volumes and of their interactions with confining medium enables to find optimum conditions either for enhancing or for suppressing the role of individual factors that influence the separation. We have shown that the complex entropy-to-enthalpy interplay in polymer solutions in confined...
Detailed record
Intramolecular self-organised structures in amphiphilic (co)polymers
 Košovan, Peter ; Procházka, Karel (advisor) ; Jungwirth, Pavel (referee) ; Cifra, Peter (referee)
59 ËÙÑÑ ÖÝ In this thesis we have presented results of our simulation studies concerning the intramolecular morphology of amphiphilic polymers. Amphiphilic polymers are those which contain two or more types of monomer units with different affinity for the solvent. Using the common terminology of polymer physics, we say that such polymers are in the selective solvent, i. e. such that it is poor for one type of units and good for the other type. In our definition of amphiphilic polymers we also include polyelectrolytes in which the good solvent conditions can be induced by the electrostatic repulsion among the charged monomer units. In our studies we have investigated both polyelectrolytes and neutral polymers of linear as well as branched topologies. While the poorly soluble monomer units have the tendency to collapse into compact globular structures, this tendency is counteracted by the excluded vol- ume repulsion among the well-soluble units. Equilibrium is attained when the two tendencies are balanced which often results in the so-called pearl-necklace confor- mation consisting of both collapsed domains (pearls) and stretched ones (strings). This behaviour has been first predicted for linear polyelectrolytes in poor solvents by Dobrynin and coworkers [8]. Later on similar structures have been predicted by...
Detailed record

Interested in being notified about new results for this query?
Subscribe to the RSS feed.
Digital Repository :: Search :: Submit :: Personalize :: Help
Powered by Invenio v1.1.2
Maintained by admin.invenio@techlib.cz
This site is also available in the following languages:
Česky  English