Makromolekulare Chemie - Neueste Forschungsartikel der Fachverlage
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beruecksichtige naturwissenschaftliche Journale:
Macromolecular Rapid Communications - published by
Wiley Interscience -
... is one the most cited journals publishing original research in general macromolecular science. Each original article is commented on by current experts in the field. The commentary describes the role of each paper in the development of the particular area of polymer science and the historical background, and significance of the article.
Macromolecules - published by
The American Chemical Society, ACS -
Focuses on all fundamentals of polymer science, including synthesis, polymerization mechanisms and kinetics, chemical modification, and solution/melt/solid-state characteristics, as well as surface properties of organic, inorganic, and naturally occurring polymers.
Macromolecular Chemistry and Physics - published by
Wiley Interscience -
The journal contains original research papers in all topical areas of polymer chemistry and physics. Outstanding macromolecular science research is presented in the form of strictly peer-reviewed Full Papers. Macromolecular Chemistry and Physics also includes Highlights, Book Reviews, Essays, Macromolecular News and Conference Reports.
Biomacromolecules - published by
The American Chemical Society, ACS -
... explores the interactions of macromolecules with biological systems and their environments as well as biological approaches to the design of polymeric materials. Cutting-edge research at the interface of polymer science and biological sciences.
Aktuelle wissenschaftliche Fachartikel der
genannten Journale:
C. H. Su, U. Jeng, S. H. Chen, S. J. Lin, Y. T. Ou, W.-T. Chuang, and A. C. Su Web Release Date: Sat, 4 Oct 2008 00:00:00 EDT (Article) DOI: 10.1021/ma801177h
Sabina P. Strand, Mohamed M. Issa, Bjørn E. Christensen, Kjell M. Vårum, and Per Artursson Web Release Date: Sat, 4 Oct 2008 00:00:00 EDT (Article) DOI: 10.1021/bm800832u
Lihao Tang, Eric P. Wasserman, David R. Neithamer, Robert D. Krystosek, Yang Cheng, Philip C. Price, Yiyong He, and Thomas J. Emge Web Release Date: Sat, 4 Oct 2008 00:00:00 EDT (Article) DOI: 10.1021/ma801468u
Henry D. Tran, Ian Norris, Julio M. D’Arcy, Hamilton Tsang, Yue Wang, Benjamin R. Mattes, and Richard B. Kaner Web Release Date: Sat, 4 Oct 2008 00:00:00 EDT (Article) DOI: 10.1021/ma800122d
Scott T. Iacono, Stephen M. Budy, Justin D. Moody, Rhett C. Smith, and Dennis W. Smith Jr. Web Release Date: Sat, 4 Oct 2008 00:00:00 EDT (Article) DOI: 10.1021/ma801440t
Joy Murage, Jennifer W. Eddy, Jennifer R. Zimbalist, Tia B. McIntyre, Zachary R. Wagner, and Felix E. Goodson Web Release Date: Sat, 4 Oct 2008 00:00:00 EDT (Article) DOI: 10.1021/ma801275y
Jingshe Song, Naiying Du, Ying Dai, Gilles P. Robertson, Michael D. Guiver, Sylvie Thomas, and Ingo Pinnau Web Release Date: Sat, 4 Oct 2008 00:00:00 EDT (Article) DOI: 10.1021/ma801000u
Katarzyna Dobrosielska, Sou Wakao, Atsushi Takano, and Yushu Matsushita Web Release Date: Sat, 4 Oct 2008 00:00:00 EDT (Article) DOI: 10.1021/ma801330p
Kenny Kong, Richard J. Davies, Robert J. Young, and Stephen J. Eichhorn Web Release Date: Sat, 4 Oct 2008 00:00:00 EDT (Article) DOI: 10.1021/ma801402w
Cécile Bouilhac, Eric Cloutet, Daniel Taton, Alain Deffieux, Redouane Borsali, and Henri Cramail Web Release Date: Fri, 3 Oct 2008 00:00:00 EDT (Article) DOI: 10.1021/ma8016772
Sarah Weisman, Holly E. Trueman, Stephen T. Mudie, Jeffrey S. Church, Tara D. Sutherland, and Victoria S. Haritos Web Release Date: Thu, 2 Oct 2008 00:00:00 EDT (Article) DOI: 10.1021/bm8005853
M. Brett Runge, Corinne E. Lipscomb, Lindsay R. Ditzler, Mahesh K. Mahanthappa, Alexei V. Tivanski, and Ned B. Bowden Web Release Date: Thu, 2 Oct 2008 00:00:00 EDT (Article) DOI: 10.1021/ma8009323
Thomas A. Shewmake, Francisco J. Solis, Robert J. Gillies, and Michael R. Caplan Web Release Date: Thu, 2 Oct 2008 00:00:00 EDT (Article) DOI: 10.1021/bm800529b
This contribution describes the preparation and characterization of PEO/montmorillonite nanocomposite gels and films containing various lithium and sodium salts. The objective is to understand how the size and diffusion abilities of different ionic species added to these systems alter the crystallinity of the polymer, and affect the mechanical properties and ionic conductivities of the solid nanocomposites. The network strength of the polymer/clay dispersions influences decisively the crystallinity of the PEO chains and the final layered texture of the solid films. The characteristics of films were investigated using a combination of techniques, such as DSC, DMA, DEA, SEM, SAXS and XRD.
W. Y. Huang, P. T. Huang, Y. K. Han, C. C. Lee, T. L. Hsieh, and M. Y. Chang Web Release Date: Tue, 30 Sep 2008 00:00:00 EDT (Article) DOI: 10.1021/ma801368z
Zongbao Wang, Giovanni C. Alfonso, Zhijun Hu, Jidong Zhang, and Tianbai He Web Release Date: Tue, 30 Sep 2008 00:00:00 EDT (Article) DOI: 10.1021/ma8005697
First and second generation aliphatic polyether dendrons based upon poly(ethylene oxide) (PEO) peripheries have been prepared using a combination of a Williamson etherification and hydroboration/oxidation reactions. The purification after each synthetic step was performed by stepwise extraction, after which the reaction yields were found to be greater than 80%. The dendrons obtained showed narrow molecular weight distributions of less than 1.09, and this was confirmed by mass spectrometry and gel permeation chromatography. Since the synthesis procedure did not involve column chromatography, it was successfully scaled up to larger quantities. The hydrophilic non-ionic dendrons prepared by this straightforward method may be employed as building blocks in the design of functional soft materials such as ionic conductors and drug carriers.
Amphiphilic poly(2-alkyl-2-oxazoline) diblock copolymers of 2-methyl-2-oxazoline (MOx) building the hydrophilic block and either 2-nonyl-2-oxazoline (NOx) for the hydrophobic or 2-(1H,1H[prime],2H,2H[prime]-perfluorohexyl)-2-oxazoline (FOx) for the fluorophilic block were synthesized by sequential living cationic polymerization. The polymer amphiphiles form core/shell micelles in aqueous solution as evidenced using small-angle neutron scattering (SANS). Whereas the diblock copolymer micelles with a hydrophobic NOxn block are spherical, the micelles with the fluorophilic FOxn are slightly elongated, as observed by SANS and TEM. In water, the micelles with fluorophilic and lipophilic cores do not mix, but coexist.
The experimental arrangement for liquid chromatography under limiting conditions of desorption was optimized, aiming at separation of the parent homopolymers from diblock copolymers. Measurements with the block copolymer PS-b-PMMA have confirmed that the method enables fast and efficient separation of both parent homopolymers PS and PMMA from the copolymers in a single run. The new experimental set-up also allows the separation of potentially present low molecular or oligomeric admixtures from the polymeric constituents of sample. The peak broadening of the non-retained macromolecules has been suppressed. The sample recovery is high and can be easily checked by the injection of a large volume of an appropriate displacer.
Films of polyaniline (PANI) featuring about 80% crystallinity and characterised with strong [pi]-[pi] stacking alignment parallel to the film surface have been obtained directly after the original synthesis upon simple drying of the aqueous PANI suspension. A strong anisotropy in the growth of the nano-sized crystals produced during the synthesis results in the formation of micrometer-length fibrils perpendicular to the film surface in the course of water evaporation. The regular intercalation of water molecules between the PANI chains seems to be crucial for their ordering throughout the synthesis and film formation.
The cleavage of different photoinitiators (PIs) of polymerization is investigated by the ESR spin trapping using two different spin traps (STs): 5,5[prime]-dimethyl-1-pyrroline N-oxide (DMPO) and phenyl N-tert-butyl nitrone (PBN). The hyperfine splitting constants for the different adducts are measured and provide a new set of data. These results show a difference of selectivity between the two (STs) and outline their complementarities.
Copolymerization of hepta-1,6-diene with ethylene using a cobalt-bis(imino)pyridine complex affords a polymer that contains trans-1,2-five-membered rings in the repeating unit from hepta-1,6-diene. The ratio of the repeating units of diene to those of ethylene is controlled from 3: 97 to 50:50, depending on the reaction conditions. Isotope-labeling reactions reveal that the major chain transfer pathway involves [beta]-hydrogen elimination of the polymer end formed after ethylene insertion.
Dave J. Adams, Derek Atkins, Andrew I. Cooper, Steve Furzeland, Abbie Trewin, and Iain Young Web Release Date: Sat, 27 Sep 2008 00:00:00 EDT (Article) DOI: 10.1021/bm8006693
Naomi Cohen-Arazi, Jeoshua Katzhendler, Michal Kolitz, and Abraham J. Domb Web Release Date: Sat, 27 Sep 2008 00:00:00 EDT (Communication to the Editor) DOI: 10.1021/ma8012477
Ira Yudovin-Farber, Nurit Beyth, Abraham Nyska, Ervin I. Weiss, Jacob Golenser, and Abraham J. Domb Web Release Date: Sat, 27 Sep 2008 00:00:00 EDT (Article) DOI: 10.1021/bm8004897
Zhuo Ke, Dean Shi, Jinghua Yin, Robert K. Y. Li, and Yiu-Wing Mai Web Release Date: Sat, 27 Sep 2008 00:00:00 EDT (Communication to the Editor) DOI: 10.1021/ma800495t
Suhee Song, Youngeup Jin, Sun Hee Kim, Jihyun Moon, Kwanghyun Kim, Jin Young Kim, Sung Heum Park, Kwanghee Lee, and Hongsuk Suh Web Release Date: Sat, 27 Sep 2008 00:00:00 EDT (Article) DOI: 10.1021/ma801420e
Andrea Barbetta, Mara Massimi, Biancalucia Di Rosario, Stefania Nardecchia, Marianna De Colli, Laura Conti Devirgiliis, and Mariella Dentini Web Release Date: Fri, 26 Sep 2008 00:00:00 EDT (Article) DOI: 10.1021/bm800599d
Maarten van Dijk, Maria L. Nollet, Pascal Weijers, Annemarie C. Dechesne, Cornelus F. van Nostrum, Wim E. Hennink, Dirk T. S. Rijkers, and Rob M. J. Liskamp Web Release Date: Fri, 26 Sep 2008 00:00:00 EDT (Article) DOI: 10.1021/bm8005984
Ronnie L. Phillips, Ik-Bum Kim, Bradley E. Carson, Björn Tidbeck, Yu Bai, Todd L. Lowary, Laren M. Tolbert, and Uwe H. F. Bunz Web Release Date: Fri, 26 Sep 2008 00:00:00 EDT (Article) DOI: 10.1021/ma8016025
A series of bioactive amphiphilic peptide derivatives that contain the RGD (Arg-Gly-Asp) sequence have been designed and prepared by the standard solid-phase peptide synthesis (SPPS) technique. The influence of the molecular structure and pH change on the morphology of the amphiphilic peptide derivatives in aqueous solution is investigated. The results reveal that the amphiphilic peptide derivatives with different molecular structures exhibit different self-assembly behavior in response to environmental changes. Furthermore, by adjusting the pH, the molecular interactions of amphiphilic peptide derivatives are tuned, which results in a morphology change.
The ability of a MgCl2 support to activate a transition metal catalyst has been found to depend both on the crystallographic structure of the support and on the nature of the catalyst. A high degree of crystallographic disorder can be very effective for the immobilization and activation of titanium and vanadium complexes, but is not necessarily effective for zirconocene activation. A highly disordered support prepared by the reaction of MgBu2 with HCl gave high activity with TiCl4 but low activity with (n-PrCp)2ZrCl2. High polymerization activities with the zirconocene were only obtained with supports of type MgCl2/AlRn(OEt)3-n prepared from the reaction of AlR3 with MgCl2 · 1.1EtOH. These supports are characterized by additional peaks in the X-ray diffraction pattern, indicating the presence of a crystalline structure which is absent in the other supports and contains highly Lewis acidic sites able to generate the active metallocenium species.
The title compound (10) was prepared from the calix[4]arene precursor (11) to form the ligand 5,11-bis(methyl(diphenylphosphino))-25,26,27,28-tetra-n-propoxy calix[4]arene (12), which was reacted with [Rh(COD)Cl]2 (COD = 1,5-cyclooctadienyl) and TlPF6 as chloride scavenger, in 31% overall chemical yield. The dimer structure in solution was demonstrated by the measurements of the 31P NMR spin-lattice relaxation time (T1) in comparison with the ligand itself. Computer modeling shows that the dimer macrocycle exhibits many possible conformers, including some with obvious steric hindrance about the Rh atom, but no apparent ring stress. 10 was tested for the catalytic homogeneous hydroformylation of hex-1-ene and compared with other closely related analogue systems recently reported in the literature.
A novel terminal modification agent to endow hyperbranched polyamidoamine (HPAMAM) with thermo-/pH-responsive properties is reported. HPAMAM with terminal vinyl groups is first synthesized and then end-capped by 1-adamantylamine (ADA). The resulting hyperbranched polymer (HPAMAM-ADA) shows interesting thermo-responsive properties in aqueous solution, which have been investigated by UV-vis spectroscopy, optical microscopy, and 1H NMR spectroscopy. The lower critical solution temperature can be controlled by adjusting the end-capping ratio of ADA. In addition, HPAMAM-ADA exhibits a pH-dependent water solubility. This pH-responsive behavior is also studied.
Propargyl cellulose with regioselective functionalization pattern was synthesized by nucleophilic displacement reaction of 6-O-toluenesulfonyl ester of cellulose (degree of substitution, DS 0.58) with propargyl amine. The novel 6-deoxy-6-aminopropargyl cellulose provides an excellent starting material for the selective dendronization of cellulose at position 6 via the copper-catalyzed Huisgen reaction yielding 6-deoxy-6-amino-(4-methyl-[1,2,3-triazolo]-1-propyl-polyamido amine) cellulose derivatives of first- (DS 0.33) and second (DS 0.25) generation, which are soluble in polar aprotic solvents. The novel biopolymer derivatives were characterized by elemental analysis, FT-IR spectroscopy, and one- and two dimensional NMR spectroscopy, showing no side reactions (cross-linking) or impurities and no conversion at the secondary positions.
Novel luminescent electrospun (ES) fibers have been successfully prepared from a conjugated rod-coil block copolymer, poly[2,7-(9,9-dihexylfluorene)]-block-poly(methyl methacrylate) (PF-b-PMMA) using a single-capillary spinneret. Experiment results indicate that PF-b-PMMA ES fibers prepared from THF, THF/DMF (50/50), and DMF contain PF block aggregated structures of dot-like (5-10 nm), line-like (10-20 nm), and ellipse-like structure (25-50 nm), respectively. Such variation of aggregation size leads to a red-shift of the absorption or luminescence spectra. In addition, the fiber diameters decrease upon enhancing the DMF content. The present study demonstrates that blue light-emitting ES fibers are successfully prepared from conjugated rod-coil diblock copolymers and their aggregate morphology and photophysical properties could be tuned through use of selective solvent.
A set of rigid [pi]-conjugated bis(terpyridine) macroligands with poly([epsiv]-caprolactone) (pCL) on their side chains was synthesized and investigated. The introduced pCL chains gave rise to enhanced processability and film-forming properties of the materials. Blue photoluminescence with high quantum yields was observed in dilute solution and in the solid state, indicating that intermolecular aggregation of the [pi]-conjugated systems was effectively suppressed. The macroligands were further used for coordination with zinc(II) ions leading to new metallo-polymers with high solubility, improved film-forming behavior and promising photophysical properties with respect to potential OLED applications.
Wesley Walker, Brittnee Veldman, Ryan Chiechi, Satish Patil, Michael Bendikov, and Fred Wudl Web Release Date: Thu, 25 Sep 2008 00:00:00 EDT (Communication to the Editor) DOI: 10.1021/ma8004873
Simone S. Silva, Antonella Motta, Márcia T. Rodrigues, Ana F. M. Pinheiro, Manuela E. Gomes, João F. Mano, Rui L. Reis, and Claudio Migliaresi Web Release Date: Thu, 25 Sep 2008 00:00:00 EDT (Article) DOI: 10.1021/bm800874q
Allen Y. Wang, Shirley Leong, Yu-Chuan Liang, Ru Chih C. Huang, Christopher S. Chen, and S. Michael Yu Web Release Date: Thu, 25 Sep 2008 00:00:00 EDT (Article) DOI: 10.1021/bm800727z
