Macromolecular Materials and Engineering
Copyright © 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
Materials Science Weekly Newsletter
Recently Published Articles
- Tuning Crystalline Morphology of High-Density Polyethylene by Tailoring its Molecular Weight Distribution for Coupling with a Secondary Flow Field
Quan-Ping Zhang, Xiao-Chao Xia, Shan He, Jian-Min Feng, Ming-Bo Yang, Yin-Tao Li and Yuan-Lin Zhou
Article first published online: 22 APR 2015 | DOI: 10.1002/mame.201500008
Both macroscopic flow and molecular rheology need to be overall considered for morphological control under the injection molding with a secondary fluid injection. In this work, the coupling of HDPE chains to a secondary flow field has been applied to design much more shish-kebab structures.
- Synthesis of A Star-Shaped Macromolecular Antioxidant Based on β-Cyclodextrin and its Antioxidative Properties in Natural Rubber
Hu Xie, Hongqiang Li, Xuejun Lai, Wenjian Wu and Xingrong Zeng
Article first published online: 21 APR 2015 | DOI: 10.1002/mame.201500030
Star-shaped macromolecular antioxidant (β-CD-DBHMP), synthesized by binding 2,6-di-tert-butyl-4-hydroxy methyl phenol onto per-2,3-acetyl-β-CD using isophorone diisocyanate as linkage, possessed unique characteristics of multi-phenol groups, high molecular weight, and special hydrophobic cavity which can be further utilized for the inclusion of secondary antioxidants, can protect natural rubber (NR) against thermal oxidation effectively, and exhibit excellent extraction resistance in NR matrix.
- Solid Curing Agents for Polyurethane Foams: Proof of Concept of the Release Mechanism
Rosaria Ciriminna, Marzia Sciortino, Ana C. Marques, Aster De Schrijver, João C. Bordado and Mario Pagliaro
Article first published online: 20 APR 2015 | DOI: 10.1002/mame.201500072
Sprayed from an aerosol can pressurized at 6 bar, the GreenCaps organosilica microspheres functionalized with glycerol break into small fragments due to sudden depressurization, releasing the encapsulated polyol. Coupled to their leach-proof nature when mixed with the polyurethane precursor mixture, this opens the route to practical use of the GreenCaps to rapidly cure greener spray PU foams.
- New Reactor Granule Technology for Highly Filled Nanocomposites: Effective Flame Retardation of Polypropylene/Magnesium Hydroxide Nanocomposites
Bulbul Maira, Patchanee Chammingkwan, Minoru Terano and Toshiaki Taniike
Article first published online: 15 APR 2015 | DOI: 10.1002/mame.201500012
A novel reactor granule technology is presented to fabricate highly filled polymer nanocomposites. Impregnation of metal alkoxides and subsequent chemical conversion in melt processing leads to nanocomposites with uniform dispersion of in situ generated nanoparticles without the aid of dispersants. A successful demonstration for polypropylene/magnesium hydroxide nanocomposites exhibits excellent flame retardation, which originates from uniform dispersion of nanoparticles.
- Synthesis of Noble Monometal and Bimetal-Modified Lignin Nanofibers and Carbon Nanofibers Through Surface-Grafted Poly(2-(Dimethylamino)Ethyl Methacrylate) Brushes
Guangzheng Gao, Frank Ko and John F. Kadla
Article first published online: 13 APR 2015 | DOI: 10.1002/mame.201500006
Metallic nanoparticle modified lignin-based carbon nanofibre mats are prepared by mono- and bi-metallic nanoparticle immobilization onto PDMAEMA polymer brushes grafted-from lignin nanofibre mats by ARGET-ATRP in aqueous solution. Subsequent carbonization produces the corresponding metallic-modified carbon nanofibres that exhibit catalytic activity with respect to the NaBH4 reduction of p-nitrophenol.