Macromolecular Materials and Engineering
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Materials Science Weekly Newsletter
Recently Published Articles
- Altering the Trigger-Behavior of Programmed Shape Memory Natural Rubber (SMNR) by Solvent Vapor
Dominik Quitmann, Michael Dibolik, Frank Katzenberg and Joerg C. Tiller
Article first published online: 12 SEP 2014 | DOI: 10.1002/mame.201400224
The trigger-behavior of a programmed SMNR is significantly changed by treating the constrained sample with solvent vapor. This solvent-induced athermal alteration of the trigger-temperature is a new way to change the properties of a shape memory polymer after programming. The here introduced evaluation method of the trigger-curve by the first derivative allows clearer insights in the trigger-behavior.
- Solid-State Properties and Controlled Release of Ranitidine Hydrochloride from Tailored Oxidised Cellulose Beads
Jani Trygg, Emrah Yildir, Ruzica Kolakovic, Niklas Sandler and Pedro Fardim
Article first published online: 10 SEP 2014 | DOI: 10.1002/mame.201400175
Oxidised cellulose beads were studied as a drug delivery systems at simulated gastrointestinal track. Spectrometric and calorimetric measurements showed that the drug was solidified in amorphous form and the release of the model drug was pH independent, providing biocompatible polymer matrix for fast and controlled drug release.
- Facile Synthesis of Hydroxyl-Terminated Oligoethylenes
Robert S. A. Meyer, Julia S. Scholtyssek and Gerrit A. Luinstra
Article first published online: 10 SEP 2014 | DOI: 10.1002/mame.201400193
An efficient one-pot two-step route to hydroxyl-terminated oligoethylenes is described. 2,6-bis[1-(2,6-dichlorophenyl-imino)ethylene] iron dichloride/MAO catalysis produces aluminum long chain alkyls in a nearly Coordinative Chain Transfer Polymerization. The alkyls are converted to hydroxyl-terminated PE by air and hydrolysis. Oxidation efficiency is higher for lower molecular weight alkyls.
- Evidences of Transesterification, Chain Branching and Cross-Linking in a Biopolyester Commercial Blend upon Reaction with Dicumyl Peroxide in the Melt
Francesca Signori, Alessia Boggioni, Maria Cristina Righetti, Consuelo Escrig Rondán, Simona Bronco and Francesco Ciardelli
Article first published online: 5 SEP 2014 | DOI: 10.1002/mame.201400187
The thermo-mechanical, rheological and structural features of the BASF Ecovio®T2280, based on PLA and PBAT, were rationalized after processing in the melt, in the presence of low (0–0.2 wt.-%) amount of DCP. The reported strategy is economically balanced, easy, reliable and effective for tuning material properties, since standard equipment and no complex purification steps were applied.
- Mechanochemical Route to Functionalized Graphene and Carbon Nanofillers for Graphene/SBR Nanocomposites
Fabian Beckert, Stephanie Trenkle, Ralf Thomann and Rolf Mülhaupt
Article first published online: 3 SEP 2014 | DOI: 10.1002/mame.201400205
New families of functionalized graphene materials are achieved by wet and dry milling of graphite. The incorporation into SBR rubber leads to the simultaneous enhancement of the Young's modulus and elongation at break. The synthesis is efficient and easy to scale up, thus leading to attractive new polymer additives.