Reference : Dendrimer-like star block and amphiphilic copolymers by combination of ring opening a...
Scientific journals : Article
Engineering, computing & technology : Materials science & engineering
Physical, chemical, mathematical & earth Sciences : Chemistry
http://hdl.handle.net/2268/4368
Dendrimer-like star block and amphiphilic copolymers by combination of ring opening and atom transfer radical polymerization
English
Hedrick, James L. [IBM Research Division, San José, California, USA > > > >]
Trollsas, Mikael [IBM Research Division, San José, California, USA > > > >]
Hawker, Craig Jon [IBM Research Division, San José, California, USA > > > >]
Atthoff, Björn [IBM Research Division, San José, California, USA > > > >]
Claesson, Hans [IBM Research Division, San José, California, USA > > > >]
Heise, Andreas [IBM Research Division, San José, California, USA > > > >]
Miller, Robert D. [IBM Research Division, San José, California, USA > > > >]
Mecerreyes, David [University of Liège (ULg) > Department of Chemistry > Center for Education and Research on Macromolecules (CERM) > >]
Jérôme, Robert mailto [University of Liège (ULg) > Depmartment of Chemistry > Center for Education and Research on Macromolecules (CERM) > >]
Dubois, Philippe [University of Mons-Hainaut (UMH) > > Laboratory of Polymer and Composite Materials > >]
15-Dec-1998
Macromolecules
Amer Chemical Soc
31
25
8691-8705
Yes (verified by ORBi)
International
0024-9297
Washington
[en] dendrimer
[en] A new type of macromolecular architecture, denoted as dendrimer-like star block copolymers, is reported. These block copolymers are described by a radial geometry where the different generations or layers are comprised of high molecular weight polymer emanating from a central core. A hexahydroxyl functional core was used as an initiator for the “living” ring opening polymerization (ROP) of ε-caprolactone producing a hydroxyl terminated six arm star polymer with controlled molecular weight and narrow polydispersities (PD < 1.1). Capping these chain ends with dendrons containing activated bromide moieties produced “macro-initiators” for atom transfer radical polymerization (ATRP). Methyl methacrylate was polymerized from these “macro-initiators” in the presence of an organometallic promoter to produce the requisite dendrimer-like star polymers. High molecular weight was obtained with low polydispersities (<1.2). Alternatively, amphiphilic character could be introduced by designing the different layers or generations to be either hydrophobic or hydrophilic. For example, methyl methacrylate (MMA) with either hydroxyethyl methacrylate (HEMA) or methacrylate functional ethylene oxide macromonomers (EO) were polymerized from these “macro-initiators” to provide a hydrophilic outer layer. The use of macromolecular building blocks allows rapid attainment of high polymer in a limited number of steps with purification between transformation requiring only polymer precipitation.
Center for Education and Research on Macromolecules (CERM)
The NSF funded MRSEC Center for Polymeric Interfaces and Macromolecular Assemblies CPIMA (NSF DMR-9400354)
Researchers
http://hdl.handle.net/2268/4368
10.1021/ma980932b
http://pubs.acs.org/doi/pdf/10.1021/ma980932b

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