Macromolecular Chemistry and Physics
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Materials Science Weekly Newsletter
Recently Published Articles
- Supramolecular Antioxidant Assemblies of Hyperbranched Polyglycerols and Phenols
Salvador Pocoví-Martínez, Ulrike Kemmer-Jonas, Julia Pérez-Prieto, Holger Frey and Salah-Eddine Stiriba
Article first published online: 15 SEP 2014 | DOI: 10.1002/macp.201400372
The first example of non-covalent supramolecular hyperbranched phenolic complexes with antioxidant activity exceeding that of tyramine, a low-molecular-weight phenolic compound, as well as that of the commercially available antioxidant Trolox, is described.
- A Critical Investigation on the Occurrence of Microwave Effects in Emulsion Polymerizations
Stephan Hayden, Alexander F. H. Studentschnig, Sigurd Schober and C. Oliver Kappe
Article first published online: 15 SEP 2014 | DOI: 10.1002/macp.201400279
The occurrence of nonthermal microwave effects during continuous and pulsed microwave heating in the emulsion polymerization of styrene and methyl methacrylate is investigated using pyrex and silicon carbide technology. Furthermore, the decomposition rate of two radical initiators (potassium persulfate and 2,2’-azobis(2-methylpropionitrile)) is examined under both microwave irradiation and conventional heating conditions.
- A Conjugated Random Copolymer of Benzodithiophene-Difluorobenzene-Diketopyrrolopyrrole with Full Visible-Light Absorption for Bulk-Heterojunction Solar Cells
Zhihui Wang, Zhanfeng Li, Haiqing Zhang, Weipeng Liu, Xiaoxiang Xu, Changfeng Si, Yanxia Cui, Qinjun Sun, Hua Wang, Fang Shi and Yuying Hao
Article first published online: 12 SEP 2014 | DOI: 10.1002/macp.201400334
A new donor–acceptor (D–A) conjugated random copolymer (PBDT-DFB-DPP) as a donor material for polymer solar cells is synthesized. The PBDT-DFB-DPP exhibits both broad light absorption (300–850 nm) and a low-lying highest occupied molecular orbital (HOMO) level (–5.42 eV). A PBDT-DFB-DPP:PC60BM-based device shows a power conversion efficiency of 2.50% with a high Voc of 0.75 V.
- Photoresponsive Glycopolymer Aggregates as Controlled Release Systems
Sajith Menon, Rahul M. Ongungal and Suresh Das
Article first published online: 10 SEP 2014 | DOI: 10.1002/macp.201400365
Azobenzene-based block glycopolymers synthesized by atom transfer radical polymerization (ATRP) give rise to spherical micellar aggregates in water. Disruption of the aggregates is observed upon irradiation with 350 nm UV light. Aggregates with a fibrous morphology are obtained if this solution is re-irradiated with 450 nm visible light or if it is allowed to age for about 2 months in the dark. Utility of the aggregates to act as a controlled release system is demonstrated using Nile Red dye.
- Shape-Memory Performance of Thermoplastic Amphiphilic Triblock Copolymer Poly(d,l-lactic acid-co-ethylene glycol-co-d,l-lactic acid) (PELA)/Hydroxyapatite Composites
Artem B. Kutikov, Kevin A. Reyer and Jie Song
Article first published online: 10 SEP 2014 | DOI: 10.1002/macp.201400340
High-molecular-weight thermoplastic poly(d,l-lactic acid-co-ethylene glycol-co-d,l-lactic acid) (PELA) (Mw = 120 kDa) is blended with hydroxyapatite at varying contents and cast into films or rapid prototyped into macroporous scaffolds. These scaffolds are readily deformed and fixed at room temperature and can rapidly recover to their reprogrammable permanent shapes when exposed to a biologically safe triggering temperature of 50 °C.