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dc.contributor.authorJunnila, Susanna
dc.contributor.authorHoubenov, Nikolay
dc.contributor.authorKaratzas, A.
dc.contributor.authorHadjichristidis, Nikolaos
dc.contributor.authorHirao, Akira
dc.contributor.authorIatrou, Hermis
dc.contributor.authorIkkala, Olli T.
dc.date.accessioned2015-08-03T09:45:38Z
dc.date.available2015-08-03T09:45:38Z
dc.date.issued2012-03-27
dc.identifier.issn00249297
dc.identifier.doi10.1021/ma202747h
dc.identifier.urihttp://hdl.handle.net/10754/562136
dc.description.abstractWe show how the self-assembly of miktoarm star copolymers can be controlled by modifying the side chains of their polypeptide arms, using A 2B and A 2B 2 type polymer/polypeptide hybrids (macromolecular chimeras). Initially synthesized PS 2PBLL and PS 2PBLL 2 (PS, polystyrene; PBLL, poly(ε-tert-butyloxycarbonyl-l-lysine) ) miktoarms were first deprotected to PS 2PLLHCl and PS 2PLLHCl 2 miktoarms (PLLHCl, poly(l-lysine hydrochloride)) and then complexed ionically with sodium dodecyl sulfonate (DS) to give the supramolecular complexes PS 2PLL(DS) and PS 2(PLL(DS)) 2. The solid-state self-assemblies of these six miktoarm systems were studied by transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR), and small- and wide-angle X-ray scattering (SAXS, WAXS). The side chains of the polypeptide arms were observed to have a large effect on the solubility, polypeptide conformation, and self-assembly of the miktoarms. Three main categories were observed: (i) lamellar self-assemblies at the block copolymer length scale with packed layers of α-helices in PS 2PBLL and PS 2PBLL 2; (ii) charge-clustered polypeptide micelles with less-defined conformations in a nonordered lattice within a PS matrix in PS 2PLLHCl and PS 2PLLHCl 2; (iii) lamellar polypeptide-surfactant self-assemblies with β-sheet conformation in PS 2PLL(DS) and PS 2(PLL(DS)) 2 which dominate over the formation of block copolymer scale structures. Differences between the 3- and 4-arm systems illustrate how packing frustration between the coil-like PS arms and rigid polypeptide conformations can be relieved by the right number of arms, leading to differences in the extent of order. © 2012 American Chemical Society.
dc.publisherAmerican Chemical Society (ACS)
dc.titleSide-chain-controlled self-assembly of polystyrene-polypeptide miktoarm star copolymers
dc.typeArticle
dc.contributor.departmentBiological and Environmental Sciences and Engineering (BESE) Division
dc.contributor.departmentChemical Science Program
dc.contributor.departmentKAUST Catalysis Center (KCC)
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Division
dc.contributor.departmentPolymer Synthesis Laboratory
dc.identifier.journalMacromolecules
dc.contributor.institutionMolecular Materials, Department of Applied Physics, Aalto University, Previously Helsinki University of Technology, P.O. Box 15100, 00076 Aalto, Finland
dc.contributor.institutionDepartment of Chemistry, University of Athens, Panepistimiopolis, Zografou, 15771 Athens, Greece
dc.contributor.institutionPolymeric and Organic Materials Department, Graduate School of Science and Engineering, Tokyo Institute of Technology, Tokyo 152-8552, Japan
kaust.personHadjichristidis, Nikolaos


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