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Direct Arylation Polycondensation of Bithiazole Derivatives with Various Acceptors

24-10-2014 | Masahiro Kuramochi; Junpei Kuwabara; Wei Lu; Takaki Kanbara, Macromolecules, 2014

Novel π-conjugated polymers with a bithiazole unit and various acceptor units were synthesized by polycondensation via Pd-catalyzed direct arylation. The results of polycondensation reactions depend on chalcogen elements in the monomers. The presence of a Se atom inhibited polymerization, ...

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Cooperative Hydrogen-Bond Pairing in Organocatalytic Ring-Opening Polymerization

22-10-2014 | Oleg I. Kazakov; Partha P. Datta; Meghedi Isajani; Elizabeth T. Kiesewetter; Matthew K. Kiesewetter, Macromolecules, 2014

Thiourea (TU)/amine base cocatalysts are commonly employed for well-controlled, highly active “living” organocatalytic ring-opening polymerizations (ROPs) of cyclic esters and carbonates. In this work, several of the most active cocatalyst pairs are shown by 1H NMR binding studies to be highly ...

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Role of Intrachain Rigidity in the Plasticization of Intrinsically Microporous Triptycene-Based Polyimide Membranes in Mixed-Gas CO2/CH4 Separations

22-10-2014 | Raja Swaidan; Bader Ghanem; Majed Al-Saeedi; Eric Litwiller; Ingo Pinnau, Macromolecules, 2014

Based on high-pressure pure- and mixed-gas (50:50) CO2/CH4 separation properties of two intrinsically microporous triptycene-based polyimides (TPDA–TMPD and TPDA–6FpDA), the intrachain rigidity central to “conventional PIM” design principles is not a singular solution to intrinsic plasticization ...

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Hierarchical Structures in Thin Films of Miktoarm Star Polymers: Poly(n-hexyl isocyanate)(12K)–Poly(ε-caprolactone)1–3(5K)

21-10-2014 | Young Yong Kim; Sungmin Jung; Changsub Kim; Brian J. Ree; Daisuke Kawato; Naoki Nishikawa; Daichi Suemasa; Takuya Is ..., Macromolecules, 2014

A series of miktoarm star polymers, [poly(n-hexyl isocyanate)(12K)]–[poly(ε-caprolactone)1–3(5K)] (PHIC–PCL1–3) (composed of a rigid self-assembling PHIC arm and one to three flexible crystallizable PCL arms), were investigated to examine the polymers’ thermal properties and nanoscale thin film ...

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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 ...

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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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Natural α-Amino Acid-Functionalized Poly(phenyleneethynylene)s (PPEs): Synthesis and Chiroptical Characterization of Aggregate States

14-10-2014 | Claudio Resta; Gennaro Pescitelli; Lorenzo Di Bari, Macromolecules, 2014

The synthesis of several novel poly(phenyleneethynylene)s (PPEs) functionalized with different natural α-amino acids methyl esters has been achieved through Cassar–Heck–Sonogashira reaction. Five different derivatives have been prepared varying the nature of the amino acid (Gly, Leu, N-methyl ...

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Control of Self-Assembled Structure through Architecturally and Compositionally Complex Block Copolymer Surfactant Mixtures

13-10-2014 | Xu Wang; Jesse L. Davis; Juan Pablo Hinestrosa; Jimmy W. Mays; S. Michael Kilbey, II, Macromolecules, 2014

The self-assembly of binary mixtures of architecturally and compositionally diverse surfactant-like polystyrene–poly(2-vinylpyridine) (PS–PVP) block copolymers (BCPs) in solution and in thin films has been systematically studied. PS–PVP BCPs of different molecular architecture synthesized by ...

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Tunable Photonic Crystals: Control of the Domain Spacings in Lamellar-Forming Diblock Copolymers by Swelling with Immiscible Selective Solvents and a Neutral Solvent

07-10-2014 | Akifumi Matsushita; Shigeru Okamoto, Macromolecules, 2014

The phase-separated morphology of three different molecular weights of polystyrene-block-polyisoprene (PS-b-PI) swollen with mixed solvents was studied by small-angle X-ray scattering (SAXS) and UV–vis spectroscopy. The solvent mixtures consisted of dimethyl phthalate (DMP) and n-tetradecane ...

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Base Stable Pyrrolidinium Cations for Alkaline Anion Exchange Membrane Applications

30-09-2014 | Fenglou Gu; Huilong Dong; Youyong Li; Zhe Sun; Feng Yan, Macromolecules, 2014

The synthesis and characterization of pyrrolidinium cation based anion exchange membranes (AEMs) are reported. Pyrrolidinium cations with various N-substituents (including methyl, ethyl, butyl, octyl, isopropyl, 2-hydroxylethyl, benzyl, and cyclohexylmethyl groups) were synthesized and ...

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