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
- Comonomer-Induced Stereo-Selectivity Enhancement in a C2-Symmetric Metallocene-Catalyzed Propylene Polymerization
Lin Ma and Jin-Yong Dong
Article first published online: 26 FEB 2015 | DOI: 10.1002/marc.201400736
A first example of copolymerization increasing the polypropylene isotacticity is reported. Trans,trans,cis-1,5,9-cyclododecatriene is found to enhance the catalyst's stereo-selectivity when copolymerized with propylene by a rac-Et(Ind)2ZrCl2/MAO catalyst system, possibly by coordinating to the metal center forming a comonomer-complexed active site controlling the whole course of polymerization.
- A Sustainable Freeze-Drying Route to Porous Polysaccharides with Tailored Hierarchical Meso- and Macroporosity
Aleksandra Borisova, Mario De Bruyn, Vitaliy L. Budarin, Peter S. Shuttleworth, Jennifer R. Dodson, Mateus L. Segatto and James H. Clark
Article first published online: 26 FEB 2015 | DOI: 10.1002/marc.201400680
Hierarchical polysaccharide aerogels with tailored meso/macropore structure are generated with a novel freeze-drying route. An interesting relationship between the water/t-butanol phase diagram and the porous network is discussed, and the role of the eutectic phase in tailoring the porosity is revealed. The route offers significant time and solvent savings and allows for solvent reuse.
- Formation of DNA-Copolymer Fibrils Through an Amyloid-Like Nucleation Polymerization Mechanism
Dawid Kedracki, Sergey K. Filippov, Nidhi Gour, Helmut Schlaad and Corinne Nardin
Article first published online: 20 FEB 2015 | DOI: 10.1002/marc.201400728
Conjugation of hydrophobic poly(2-oxazoline) bearing tertiary amide groups along its backbone with a short single stranded nucleotide sequence results in an amphiphilic comb/graft copolymer which organizes in fibrils in aqueous solution according to a nucleation polymerization mechanism.
- Solvent Vapor Annealing of Block Copolymers in Confined Topographies: Commensurability Considerations for Nanolithography
Cian Cummins, Roisin A. Kelly, Anushka Gangnaik, Yordan M. Georgiev, Nikolay Petkov, Justin D. Holmes and Michael A. Morris
Article first published online: 19 FEB 2015 | DOI: 10.1002/marc.201400722
An unusual nanodomain size variation is observed following the solvent vapor annealed graphoepitaxial alignment of a cylinder forming poly(styrene)-block-poly(4-vinylpyridine) (PS-b-P4VP) block copolymer. Reduced silicon nanofin feature sizes are evident at sidewalls after pattern transfer of alumina impregnated P4VP domains acting as a hardmask. A larger commensurability strategy is suggested to circumvent varying nanodomain sizes after solvent treatment.
- Optical Mechanotransduction with Carbazole-Based Luminescent Liquid Single-Crystal Elastomers
Jaume Garcia-Amorós and Dolores Velasco
Article first published online: 19 FEB 2015 | DOI: 10.1002/marc.201400734
The covalent attachment of carbazole derivatives into nematic liquid single-crystal elastomers (LSCEs) allows to tune their luminescence on demand under mechanical control in a quick and reversible fashion. The fluorescence intensity for these materials can be switched reversibly in less than a second with no sign of fatigue. Hence, mechanical forces are valuable external stimuli to modulate the fluorescence of nematic elastomers rapidly and reversibly enabling, therefore, optical mechanotransduction.