Macromolecular Materials and Engineering

Cover image for Vol. 298 Issue 10

October 2013

Volume 298, Issue 10

Pages 1029–1132

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      Macromol. Mater. Eng. 10/2013 (page 1029)

      Ranganathan Krishnan, Subramanian Sundarrajan and Seeram Ramakrishna

      Version of Record online: 4 OCT 2013 | DOI: 10.1002/mame.201370030

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      Cover: The fabrication of polyelectrolyte nanofibrous scaffolds from aqueous polymer solutions through a simple and versatile green electrospinning process is presented. The generation of different architectures under various spinning conditions and the application of polyelectrolyte scaffolds from polysaccharides and biopolymers for skin, cartilage, heart, and bone applications are reviewed. Further details can be found in the article by R. Krishnan, S. Sundarrajan,* and S. Ramakrishna* on page 1034.

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    1. Green Processing of Nanofibers for Regenerative Medicine (pages 1034–1058)

      Ranganathan Krishnan, Subramanian Sundarrajan and Seeram Ramakrishna

      Version of Record online: 17 DEC 2012 | DOI: 10.1002/mame.201200323

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      The fabrication of polyelectrolyte nanofiber scaffolds from aqueous polymer solution via a green electrospinning process is described. Generation of different architectures under various spinning conditions, application of polysaccharides and biopolymers scaffolds (for skin, cartilage, heart, and bone applications), drawbacks of the current methods, and future challenges are reviewed.

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    1. Direct Electrospinning of Cellulose–Chitosan Composite Nanofiber (pages 1059–1064)

      Kesavan Devarayan, Hirokatsu Hanaoka, Masakazu Hachisu, Jun Araki, Masakatsu Ohguchi, Bijoya Kumar Behera and Kousaku Ohkawa

      Version of Record online: 7 MAY 2013 | DOI: 10.1002/mame.201200337

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      The direct electrospinning of cellulose–chitosan is described for the first time. The electrospun non-woven fabrics (ESNWs) are prepared from either bamboo or cotton cellulose with chitosan using an organic acid–solvent mixture. The average fiber diameters are <100 nm. The alkaline–alcohol treatment of the composite fibers produces the water-resistant ESNW.

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    1. PLA/PHBV Films with Improved Mechanical and Gas Barrier Properties (pages 1065–1073)

      Majdi Boufarguine, Alain Guinault, Guillaume Miquelard-Garnier and Cyrille Sollogoub

      Version of Record online: 19 DEC 2012 | DOI: 10.1002/mame.201200285

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      PLA/PHBV blends with PHBV lamellas of micrometer-size thicknesses dispersed homogeneously within the PLA matrix were obtained using a multilayer co-extrusion device. This microstructure leads to enhanced elongation at break and gas barrier properties compared with neat PLA or other classical blending methods. These new PLA/PHBV blends are a promising material for applications such as food packaging.fx1

    2. On the Flame Resistance Behavior of PP/PET Blends in the Presence of Nanoclay and a Halogen-Free Flame Retardant (pages 1074–1084)

      Mehdi Entezam, Hossein Ali Khonakdar and Ali Akbar Yousefi

      Version of Record online: 23 NOV 2012 | DOI: 10.1002/mame.201200195

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      Analysis of the flame retardancy behavior of PP/PET blends containing organoclay as well as a halogen-free flame retardant by means of cone calorimetry, TGA and LOI techniques combined with a detailed analysis of morphological and rheological properties reveals that the organoclays which are mainly localized in PET phase are capable of improving the thermal stability of the PET-rich blend.fx1

    3. Selective Wetting and Localization of Silica in Binary and Ternary Blends Based on Styrene Butadiene Rubber, Butadiene Rubber, and Natural Rubber (pages 1085–1099)

      Hong Hai Le, Melanie Keller, Martin Hristov, Sybill Ilisch, Tung Hoang Xuan, Quang Khang Do, Tung Pham, Klaus-Werner Stöckelhuber, Gert Heinrich and Hans-Joachim Radusch

      Version of Record online: 18 DEC 2012 | DOI: 10.1002/mame.201200307

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      In the present work, the wetting concept is further developed for better understanding the wetting behavior of silica by rubber molecules. A comparison between the kinetics of filler localization and the filler localization at an equilibrium predicted by our Z-model provides a deeper insight into the filler transfer process taking place during the mixing process.

    4. Nanostructure Transitions and Their Relation to Mechanical Properties in Polyethylene/Polyamide 6 Microfibrillar Composites as Revealed by SAXS/Straining Studies (pages 1100–1116)

      Nadya Dencheva, Zlatan Denchev, Norbert Stribeck, Mladen Motovilin, Ahmad Zeinolebadi, Sergio S. Funari and Stephan Botta

      Version of Record online: 13 DEC 2012 | DOI: 10.1002/mame.201200292

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      Microfibrillar composites comprising a matrix of high-density polyethylene (HDPE) and reinforcements of polyamide 6 (PA6) are studied by synchrotron SAXS during continuous straining. The nanostructure evolution in the PA6 fibrils and their transcrystalline HDPE shell is followed and related to the compatibilizer and clay content. Proofs of reversible strain-induced crystallization of HDPE are found.

    5. Synthesis and Characterization of Polysulfone/POSS Hybrid Networks by Photoinduced Crosslinking Polymerization (pages 1117–1123)

      Cemil Dizman, Tamer Uyar, Mehmet Atilla Tasdelen and Yusuf Yagci

      Version of Record online: 19 DEC 2012 | DOI: 10.1002/mame.201200351

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      Polysulfone-based hybrid networks containing various POSS loadings are synthesized by photoinduced copolymerization of polysulfone dimethacrylate and multifunctional POSS-methacrylamide. While TEM results suggest the random dispersion of POSS in the polymer matrix, thermal and dynamic mechanical analyses clearly confirm the better thermal and mechanic behavior of hybrid networks.

    6. A Combined NMR Relaxometry and Surface Instability Detection System for Polymer Melt Extrusion (pages 1124–1132)

      Karl-Friedrich Ratzsch, Roland Kádár, Ingo F. C. Naue and Manfred Wilhelm

      Version of Record online: 26 AUG 2013 | DOI: 10.1002/mame.201300243

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      In-line monitoring can be a valuable tool for process setup, optimization, and quality control. In this framework, a pressure fluctuation detection at the extruder die, directed at the detection of melt flow instabilities is combined with NMR relaxometry, sensitive to the changes in molecular mobility during solidification.

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