Cylindrical polymer brushes with dendritic side chains by iterative anionic reactions

Handle URI:
http://hdl.handle.net/10754/566093
Title:
Cylindrical polymer brushes with dendritic side chains by iterative anionic reactions
Authors:
Zhang, Hefeng; Qu, Chengke; He, Junpo
Abstract:
We report in this paper an easy method for the synthesis of cylindrical polymer brushes with dendritic side chains through anionic reaction. The synthesis is accomplished by iteratively grafting a living block copolymer, polyisoprene-. b-polystyrenyllithium (PI-. b-PSLi), to the main chain and subsequently to the branches in a divergent way. PI segment is short and serves as a precursor for multifunctional branching unit. The grafting reaction involves two successive steps: i) epoxidation of internal double bonds of PI segments, either in main chain or side chains; ii) ring-opening addition to the resulting epoxy group by the living PI-. b-PSLi. Repeating the two steps affords a series of cylindrical polymer brushes with up to 3rd generation and extremely high molecular weight. The branching multiplicity depends on the average number of oxirane groups per PI segment, usually ca. 8 in the present work. The high branching multiplicity leads to tremendous increase in molecular weights of the cylindrical products with generation growth. Several series of cylindrical polymer brushes with tunable aspect ratios are prepared using backbones and branches with controlled lengths. Shape anisotropy is investigated in dilute solution using light scattering technique. Worm-like single molecular morphology with large persistence length is observed on different substrates by atomic force microscopy.
KAUST Department:
KAUST Catalysis Center (KCC); Physical Sciences and Engineering (PSE) Division; Polymer Synthesis Laboratory
Publisher:
Elsevier BV
Journal:
Polymer
Issue Date:
May-2015
DOI:
10.1016/j.polymer.2015.02.004
Type:
Article
ISSN:
00323861
Appears in Collections:
Articles; Physical Sciences and Engineering (PSE) Division; KAUST Catalysis Center (KCC)

Full metadata record

DC FieldValue Language
dc.contributor.authorZhang, Hefengen
dc.contributor.authorQu, Chengkeen
dc.contributor.authorHe, Junpoen
dc.date.accessioned2015-08-12T09:27:58Zen
dc.date.available2015-08-12T09:27:58Zen
dc.date.issued2015-05en
dc.identifier.issn00323861en
dc.identifier.doi10.1016/j.polymer.2015.02.004en
dc.identifier.urihttp://hdl.handle.net/10754/566093en
dc.description.abstractWe report in this paper an easy method for the synthesis of cylindrical polymer brushes with dendritic side chains through anionic reaction. The synthesis is accomplished by iteratively grafting a living block copolymer, polyisoprene-. b-polystyrenyllithium (PI-. b-PSLi), to the main chain and subsequently to the branches in a divergent way. PI segment is short and serves as a precursor for multifunctional branching unit. The grafting reaction involves two successive steps: i) epoxidation of internal double bonds of PI segments, either in main chain or side chains; ii) ring-opening addition to the resulting epoxy group by the living PI-. b-PSLi. Repeating the two steps affords a series of cylindrical polymer brushes with up to 3rd generation and extremely high molecular weight. The branching multiplicity depends on the average number of oxirane groups per PI segment, usually ca. 8 in the present work. The high branching multiplicity leads to tremendous increase in molecular weights of the cylindrical products with generation growth. Several series of cylindrical polymer brushes with tunable aspect ratios are prepared using backbones and branches with controlled lengths. Shape anisotropy is investigated in dilute solution using light scattering technique. Worm-like single molecular morphology with large persistence length is observed on different substrates by atomic force microscopy.en
dc.publisherElsevier BVen
dc.subjectAnionic polymerizationen
dc.subjectCylindrical polymer brushen
dc.subjectDendritic structureen
dc.titleCylindrical polymer brushes with dendritic side chains by iterative anionic reactionsen
dc.typeArticleen
dc.contributor.departmentKAUST Catalysis Center (KCC)en
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Divisionen
dc.contributor.departmentPolymer Synthesis Laboratoryen
dc.identifier.journalPolymeren
dc.contributor.institutionState Key Laboratory of Molecular Engineering of Polymers, Department of Macromolecular Science, Fudan University, Shanghai, 200433, Chinaen
kaust.authorZhang, Hefengen
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