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In Situ Observation of Ca2+ Diffusion-Induced Superstructure Formation of a Rigid Polyanion

17-10-2014 | Zi Liang Wu; Riku Takahashi; Daisuke Sawada; Md. Arifuzzaman; Tasuku Nakajima; Takayuki Kurokawa; Jian Hu; Jian Ping ..., Macromolecules, 2014

Diffusion of multivalent metallic ions into aqueous solution of rigid, negatively charged macromolecules of high concentration is an effective approach to prepare macroscopically anisotropic hydrogels. However, the mechanism for superstructure formation is still not clear. By observing the mixing ...


Covalent Ferrohydrogels Based on Elongated Particulate Cross-Linkers

17-10-2014 | L. Roeder; M. Reckenthäler; L. Belkoura; S. Roitsch; R. Strey; A. M. Schmidt, Macromolecules, 2014

Macromolecules DOI: 10.1021/ma501396j


Translational and Reorientational Dynamics of Entangled DNA

17-10-2014 | Zongying Gong; Johan R. C. van der Maarel, Macromolecules, 2014

The end-group mean square displacement, molecular reorientation time, and radius of gyration of entangled λ-phage DNA molecules were measured with fluorescence microscopy. A frequency-dependent, complex diffusivity is derived by Fourier transformation of the mean square displacement. From a ...


Stereoblock-like Brush Copolymers Consisting of Poly(l-lactide) and Poly(d-lactide) Side Chains along Poly(norbornene) Backbone: Synthesis, Stereocomplex Formation, and Structure–Property Relationship

16-10-2014 | Takuya Isono; Yohei Kondo; Shun Ozawa; Yougen Chen; Ryosuke Sakai; Shin-ichiro Sato; Kenji Tajima; Toyoji Kakuchi; T ..., Macromolecules, 2014

Random and block copolymerizations of poly(l-lactide) (PLLA) and poly(d-lactide) (PDLA) macromonomers having an exo-norbornene group at the α- or ω-chain end (D/L ratio = 1/1, Mn = ca. 5000 g mol–1) were performed via ring-opening metathesis polymerization to produce the brush random and block ...


Comparative Studies on the Relations between Composition Ratio and Charge Transport of Diketopyrrolopyrrole-Based Random Copolymers

16-10-2014 | Hui-Jun Yun; Jangwhan Cho; Dae Sung Chung; Yun-Hi Kim; Soon-Ki Kwon, Macromolecules, 2014

Random copolymerization strategy is introduced to increase the solubility of donor–acceptor copolymers so that they can be processed with environmentally benign, halogen-free solvents. Traditionally, it has been believed that the random copolymer with a lower crystalline order should have a ...


Determination of Silkworm Silk Fibroin Compressibility Using High Hydrostatic Pressure with in Situ X-ray Microdiffraction

16-10-2014 | Christina Krywka; Igor Krasnov; Roxana Figuli; Manfred Burghammer; Martin Müller, Macromolecules, 2014

A hydrostatic high pressure cell is used to record pressure resolved wide-angle X-ray microdiffraction data (WAXS) from Bombyx mori silkworm silk fibers with in situ pressurization in the range of 0.01–0.5 GPa (0.1–5 kbar). From the pressure dependent peak positions of (002), (020), (200), and ...


Mechanochemical Route to Graphene-Supported Iron Catalysts for Olefin Polymerization and in Situ Formation of Carbon/Polyolefin Nanocomposites

16-10-2014 | F. Beckert; S. Bodendorfer; W. Zhang; R. Thomann; R. Mülhaupt, Macromolecules, 2014

A facile one-step mechanochemical process converts graphite into highly active graphene-supported iron catalysts for ethylene polymerization and the in situ formation of graphene/polyethylene nanocomposites. Key feature is the dry grinding of graphite in a steel ball mill under carbon dioxide ...


ATR Copolymerization of Styrene with 2-Vinylfuran: An Entry to Functional Styrenic Polymers

16-10-2014 | Sheila Ortega Sánchez; Francesco Marra; Angela Dibenedetto; Michele Aresta; Alfonso Grassi, Macromolecules, 2014

Samples of styrene-co-(2-vinylfuran) polymers (S-co-2VFs) were obtained in a wide range of composition via ATRP catalyzed by Cu(I)-PMDETA using 1-phenylethyl bromide (1-PEBr) as initiator. Investigation of the copolymerization kinetics allowed evaluating the reactivity ratios rs and rVF (rs = ...


Role of Molecular Weight Distribution on Charge Transport in Semiconducting Polymers

16-10-2014 | Scott Himmelberger; Koen Vandewal; Zhuping Fei; Martin Heeney; Alberto Salleo, Macromolecules, 2014

Model semiconducting polymer blends of well-controlled molecular weight distributions are fabricated and demonstrated to be a simple method to control intermolecular disorder without affecting intramolecular order or degree of aggregation. Mobility measurements exhibit that even small amounts of ...


Poly(ferulic acid-co-tyrosine): Effect of the Regiochemistry on the Photophysical and Physical Properties en Route to Biomedical Applications

14-10-2014 | Amandine Noel; Yannick P. Borguet; Jeffery E. Raymond; Karen L. Wooley, Macromolecules, 2014

The photophysical and mechanical properties of novel poly(carbonate-amide)s derived from two biorenewable resources, ferulic acid (FA) and l-tyrosine ethyl ester, were evaluated in detail. From these two bio-based precursors, a series of four monomers were generated (having amide and/or carbonate ...


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