Macromolecular Materials and Engineering
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Materials Science Weekly Newsletter
Recently Published Articles
- Shape-Memory Capability of Copolyetheresterurethane Microparticles Prepared via Electrospraying
Quanchao Zhang, Tilman Sauter, Liang Fang, Karl Kratz and Andreas Lendlein
Article first published online: 29 JAN 2015 | DOI: 10.1002/mame.201400267
Copolyetheresterurethane microparticles with a diameter of 3.9 ± 0.9 μm are prepared via electrospraying. A pronounced thermally-induced shape-memory effect, characterized by a shape recovery ratio of 80%, was achieved by applying low programming pressures (programmed particles size: 5.1 μm). By applying of high programming pressure the microparticles were transformed into a smart temporary film, which disintegrates upon heating to 60 °C.
- Phase Separated Methylated Polybenzimidazole (O-PBI) Based Anion Exchange Membranes
Wiebke Germer, Janine Leppin, Carolina Nunes Kirchner, Hyeongrae Cho, Hyoung-Juhn Kim, Dirk Henkensmeier, Kwan-Young Lee, Mateusz Brela, Artur Michalak and Alexander Dyck
Article first published online: 28 JAN 2015 | DOI: 10.1002/mame.201400345
Anion exchange membranes are prepared from methylated polybenzimidazole and are exchanged with various anions. Thermal and mechanical properties are evaluated. Unlike other anions, carbonate and bicarbonate exchanged membranes reveal an ionomer peak in SAXS measurements suggesting a phase separated morphology. Water uptake and swelling behavior are rationalized by theoretical DFT calculations.
- Isothermal Crystallization Kinetics of Poly (Ethylene 2,5-Furandicarboxylate)
Jesper G. van Berkel, Nathanaël Guigo, Jeffrey J. Kolstad, Laszlo Sipos, Bing Wang, Matheus A. Dam and Nicolas Sbirrazzuoli
Article first published online: 28 JAN 2015 | DOI: 10.1002/mame.201400376
The basic crystal parameters and crystallization kinetics of poly (ethylene 2,5-furandicarboxylate) (PEF) are presented in this paper. A relation of the crystal growth rate to both temperature and molecular weight is provided by fitting of experimental data with Avrami and Hoffman-Lauritzen theory for catalyst-free PEF. Subsequently the significant effect of catalyst presence is highlighted.
- Nanoporous Poly(Melamine Formaldehyde) Networks by Aqueous Dispersion Polycondensation—Synthesis and Adsorption Properties
Dana Schwarz and Jens Weber
Article first published online: 26 JAN 2015 | DOI: 10.1002/mame.201400330
The preparation of nanoporous melamine-formaldehyde resins by aqueous dispersion polycondensation is presented. Multimodal porosity is achieved by an interplay of templating and phase separation, resulting in materials with high potential for adsorption applications, as exemplified by CO2 adsorption.
- High Pressure Crystallization of Vitamin E-containing Radiation Cross-linked UHMWPE
Brinda N. Doshi, Bassem Ghali, Christine Godleski-Beckos, Andrew J. Lozynsky, Ebru Oral and Orhun K. Muratoglu
Article first published online: 23 JAN 2015 | DOI: 10.1002/mame.201400294
High pressure crystallization of radiation cross-linked ultrahigh molecular weight polyethylene (UHMWPE) in the presence of the antioxidant vitamin E is demonstrated to improve fatigue resistance without sacrificing wear resistance. This is significant for joint implants fabricated from this unique polymer because it may enable bearing surfaces that can be used more effectively under adverse loading conditions.