Macromolecular Chemistry and Physics
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Materials Science Weekly Newsletter
Recently Published Articles
- Tandem Action of SNS–Cr and CGC–Ti in Preparation of Ethylene–1-Hexene Copolymers from Ethylene Feedstock
Song Guo, Hong Fan, Zhiyang Bu, Bo-Geng Li and Shiping Zhu
Article first published online: 28 JUL 2014 | DOI: 10.1002/macp.201400290
Ethylene–1-hexene copolymers, ranging from semicrystalline linear low-density polyethylene (LLDPE) to completely amorphous polyethylene (PE), are prepared from ethylene-only stock by the tandem polymerization of SNS–Cr and CGC–Ti. 1-Hexene content in the resulting copolymers can be adjusted by varying the Cr–Ti molar ratio and/or applying a short period of pre-trimerization. Copolymers with high 1-hexene content up to 15 mol% are obtained.
- Solvent-Assisted Orientation of Poly(3-hexylthiophene)-Functionalized CdSe Nanorods Under an Electric Field
Sirinya Chantarak, Feng Liu, Todd Emrick and Thomas P. Russell
Article first published online: 28 JUL 2014 | DOI: 10.1002/macp.201400188
The long-range vertical ordering of high aspect ratio CdSe nanorods is described. Multiple layers of close-packed hexagonal nanorod arrays are achieved through the application of an electric field during nanorod assembly. Vertically oriented CdSe nanorods, surface-functionalized with polythiophene, holds potential for improving charge transport in hybrid bulk heterojunction solar cells.
- Synthesis of Novel Sustainable Oligoamides Via Ring-Opening Polymerization of Lactams Based on (−)-Menthone
Malte Winnacker, Sergei Vagin, Verena Auer and Bernhard Rieger
Article first published online: 28 JUL 2014 | DOI: 10.1002/macp.201400324
The monoterpene ketone (−)-menthone is transformed into two different lactams, which are oligomerized, resulting in novel sustainable oligoamide structures, which contain side groups and stereocenters. This study addresses regiochemistry, synthesis, and analysis of these compounds and provides a basis for a new type of biobased polyamides with very interesting structures.
- Controlled Radical Polymerization Using a Novel Symmetrical Selenium RAFT Agent
Carlo Botha, Wolfgang Weber, Helen Pfukwa and Harald Pasch
Article first published online: 28 JUL 2014 | DOI: 10.1002/macp.201400296
A novel symmetrical selenium (Se)-based reversible addition-fragmentation chain transfer (RAFT) agent, Se,Se’-dibenzyl carbonodiselenothioate, is synthesized and used in the controlled radical polymerization of styrene. Little is known about the polymerization behavior of Se-based RAFT agents, which is the motivation for this study. The incorporation of the Se-RAFT agent into the polymer structure and the polymerization process are investigated by NMR spectroscopy.
- Individually Addressable Suspended Conducting-Polymer Wires in a Chemiresistive Gas Sensor
Won Suk Chang, Jung Hyun Kim, Daeho Kim, Sung Ho Cho and Seung Kwon Seol
Article first published online: 28 JUL 2014 | DOI: 10.1002/macp.201400220
Wire transducers with arched features for chemiresistive gas sensors are fabricated by 3D printing with fountain-pen lithography. The signal-to-noise ratio in the sensing response is enhanced by increasing the number of wires with a larger surface-to-volume ratio, in parallel to increasing the signal level and diminishing the baseline noise in the wire transducers.