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dc.contributor.authorBertran Cànovas, Òscar
dc.contributor.authorZhang, Baozhong
dc.contributor.authorSchlüter, A. Dieter
dc.contributor.authorKröger, Martin
dc.contributor.authorAlemán Llansó, Carlos
dc.contributor.otherUniversitat Politècnica de Catalunya. Departament de Física Aplicada
dc.contributor.otherUniversitat Politècnica de Catalunya. Departament d'Enginyeria Química
dc.date.accessioned2013-07-16T08:21:18Z
dc.date.created2013-05-16
dc.date.issued2013-05-16
dc.identifier.citationBertran, O. [et al.]. Computer simulation of fifth generation dendronized polymers: impact of charge on internal organization. "Journal of physical chemistry B", 16 Maig 2013, vol. 117, núm. 19, p. 6007-6017.
dc.identifier.issn1520-6106
dc.identifier.urihttp://hdl.handle.net/2117/19956
dc.description.abstractThe internal organization of a fifth-generation dendronized polymer (PG5) has been investigated by atomistic molecular dynamics simulations in a vacuum. This study reveals an exceptional behavior of PG5 within the homologous series of g-generation PGg polymers. Three molecular configurations, which present a heterogeneous distribution of dendrons and an amount of backfolding lower than PG4 and PG6, have been obtained for PG5. The highest stability and closest agreement with available experimental data corresponds to a helical conformation characterized by a pitch of about 30 Å, thickness of 105 Å, and average density of 0.861 g/cm3. While small angle neutron scattering studies of PG5 in solution show a constant radial density distribution around the backbone, we here in our vacuum studies find a cylindrical volume element of sharply reduced density reminiscent of a pore. This neutral PG5 was compared with its charged deprotected analogue, dePG5 in water, to see in as much the positive charges in the periphery of this macromolecule would affect its conformational behavior. During deprotection of PG5, the tert-butyloxycarbonyl protected amine groups are converted into ammonium, mimicking the experimental situation during a divergent synthesis procedure. The repulsive interactions among the positively charged ammonium groups are responsible for a huge (∼30%) reduction of the average density and a small (∼1%) increase of elongation of the helical backbone, which results in a structure with a spongy appearance. Also here, we find a reduced dendron density near the backbone which is compensated for by the pore being filled with water
dc.format.extent11 p.
dc.language.isoeng
dc.subjectÀrees temàtiques de la UPC::Física::Física molecular
dc.subject.lcshPolymers
dc.subject.lcshVacuum
dc.subject.otherDendrimers
dc.subject.otherComputer simulation
dc.subject.otherVacuum
dc.titleComputer simulation of fifth generation dendronized polymers: impact of charge on internal organization
dc.typeArticle
dc.subject.lemacFísica molecular
dc.subject.lemacPolímers -- Anàlisi
dc.contributor.groupUniversitat Politècnica de Catalunya. IMEM - Innovació, Modelització i Enginyeria en (BIO) Materials
dc.identifier.doi10.1021/jp402695g
dc.rights.accessRestricted access - publisher's policy
local.identifier.drac12662686
dc.description.versionPostprint (published version)
dc.date.lift10000-01-01
local.citation.authorBertran, O.; Zhang , B.; Schlüter, A.; Kröger , M.; Aleman, C.
local.citation.publicationNameJournal of physical chemistry B
local.citation.volume117
local.citation.number19
local.citation.startingPage6007
local.citation.endingPage6017


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