Macromolecular Rapid Communications
Copyright © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
Editors: Kirsten Severing , Stefan Spiegel
Online ISSN: 1521-3927
Materials Science Weekly Newsletter
Recently Published Articles
- Polymers Containing Nickel(II) Complexes of Goedken's Macrocycle: Optimized Synthesis and Electrochemical Characterization
Joseph A. Paquette, Ethan R. Sauvé and Joe B. Gilroy
Article first published online: 31 OCT 2014 | DOI: 10.1002/marc.201400500
The synthesis and characterization of a new class of metallopolymers composed of nickel(II) complexes of Goedken's macrocycle and 9,9-dihexylfluorene units is described. Cyclic voltammetry studies show that the polymers can be reversibly oxidized at potentials of 0.24 and 0.73 V versus the ferrocene/ferrocenium redox couple, while thermal and spectroscopic analysis reveals their exceptional stability and intriguing electronic properties.
- Solvent Effects on Acrylate kp in Organic Media?—A Systematic PLP–SEC Study
Alexander P. Haehnel, Benjamin Wenn, Katrin Kockler, Tobias Bantle, Andrea M. Misske, Friederike Fleischhaker, Thomas Junkers and Christopher Barner-Kowollik
Article first published online: 31 OCT 2014 | DOI: 10.1002/marc.201400479
The solvent dependence of the FRP propagation reaction is probed by examining solutions of linear acrylates in butyl acetate and toluene in comparison to bulk. In contrast to previous reports (and aqueous systems), no solvent effects are detectable. Instead—for the first time—a correlation between the Arrhenius parameters and ester side chain length is observed.
- Conjugated Polymer Composite Nanoparticles by Rapid Mixing
Christoph Jung, Tjaard de Roo and Stefan Mecking
Article first published online: 31 OCT 2014 | DOI: 10.1002/marc.201400384
Hybrid particles from the conjugated polymers poly(9,9-di-n-hexylfluoren-2,7-diyl) (PF) and poly[(9,9-di-n-octylfluoren-2,7-diyl)-alt-(benzo[2,1,3]thiadiazol-4,8-diyl)] (F8BT) and the inorganic nanocrystals TiO2, CdSe, and CdSe/CdS are obtained by rapid mixing. Tetrahydrofuran (THF) solutions of the polymer/inorganic particles are subjected to kinetic trapping by turbulent mixing with aqueous sodium dodecyl sulfate (SDS) solutions in a multi-inlet vortex mixer (MIVM). Small, homogenous composite particles are obtained, showing close spatial and electronic proximity as evidenced by an energy transfer between the organic and inorganic constituents.
- Synthesis and Sequential Deprotection of Triblock Copolypept(o)ides Using Orthogonal Protective Group Chemistry
Philipp Heller, Benjamin Weber, Alexander Birke and Matthias Barz
Article first published online: 30 OCT 2014 | DOI: 10.1002/marc.201400466
The synthesis of orthogonally deprotectable triblock copolypept(o)ides is described. These polymers are based on polysarcosine, poly-N-ε-t-butyloxycarbonyl-l-lysine, and poly-N-ε-t-trifluoroacetyl-l-lysine. They are prepared by ring-opening polymerization of the corresponding α-amino acid N-carboxyanhydrides (NCAs). For the synthesis of N-ε-t-butyloxycarbonyl-l-lysine (lysine(Boc)) NCAs, an acid-free method using trimethylsilylchloride/triethylamine as hydrochloric acid (HCl) scavengers is presented.
- Zirconium-Allyl Complexes as Resting States in Zirconocene-Catalyzed α-Olefin Polymerization
Valentina N. Panchenko, Dmitrii E. Babushkin and Hans H. Brintzinger
Article first published online: 30 OCT 2014 | DOI: 10.1002/marc.201400444
Formation of zirconocene cations with Zr-bound allylic chain ends is shown to be a general phenomenon when olefins are polymerized with a zirconocene catalyst. The rate and the extent of Zr-allyl formation depend on the kinds of zirconocene precatalysts and activators used for the catalyst system considered.