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
- Rapid End-Group Modification of Polysaccharides for Biomaterial Applications in Regenerative Medicine
Somasekhar Bondalapati, Emil Ruvinov, Olga Kryukov, Smadar Cohen and Ashraf Brik
Article first published online: 15 SEP 2014 | DOI: 10.1002/marc.201400354
An efficient and straightforward approach for site-selective modification of various polysaccharides via oxime conjugation at their reducing end is reported. The alginate conjugates synthesized by this approach exhibit a remarkable enhancement in their rheological and biofunctional properties such as hydrogel formation and cell adhesive and proliferative properties compared with the randomly modified polysaccharides.
- A Polyurethane-Based Positive Photoresist
Luis García-Fernández, Alexandre Specht and Aránzazu del Campo
Article first published online: 15 SEP 2014 | DOI: 10.1002/marc.201400331
Photodegradable polyurethane formulations are presented and applied for micropatterning using UV light and two-photon lasers. These new materials represent readily available, versatile, and easy-to-use positive tone photoresists for low-cost lithography applications.
- Multidetector Thermal Field-Flow Fractionation as a Novel Tool for the Microstructure Separation of Polyisoprene and Polybutadiene
Guilaume Greyling and Harald Pasch
Article first published online: 15 SEP 2014 | DOI: 10.1002/marc.201400405
For the first time, thermal field-flow fractionation (ThFFF) is shown to be selective toward polymer microstructure. Using tetrahydrofuran (THF) and cyclohexane as mobile phases, it is shown that 1,4-polyisoprene and 3,4-polyisoprene can be fractionated according to their isomeric compositions. The study is extended to polybutadiene and it is demonstrated that ThFFF separates 1,4- and 1,2-polybutadiene in a similar fashion. It is found that the mobile phase significantly affects the ThFFF selectivity with cyclohexane providing the best separation.
- Reinforcing Poly(ethylene) with Cellulose Nanocrystals
Janak Sapkota, Mehdi Jorfi, Christoph Weder and Earl Johan Foster
Article first published online: 10 SEP 2014 | DOI: 10.1002/marc.201400382
The fabrication of nanocomposites of low-density poly(ethylene) and cellulose nanocrystals is reported. It is observed that it is possible to kinetically trap homogeneous nanocomposites by using a templating approach resulting in a significant improvement in storage modulus and strength. The obtained nanocomposites maintain a high level of dispersion even after reprocessing in conventional twin screw extruders.
- Supramolecular Chemistry in the Formation of Self-Assembled Nanostructures from a High-Molecular-Weight Rod–Coil Block Copolymer
Yingfeng Tu, Zhichao Ji, Xiaoming Yang, Xinhua Wan and Qi-Feng Zhou
Article first published online: 10 SEP 2014 | DOI: 10.1002/marc.201400381
The self-assembly of a high-molecular-weight rod–coil copolymer, PS620-b-PMPCS1000, in p-xylene is studied. The self-assembled cylindrical micelles or spherical micelles can undergo supramolecular chemistry to form segmental cylindrical micelle associates or spherical micelles associates. The driving force for this supramolecular chemistry is the chain entanglement between the long PS coils.