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Effect of Excipients on the Stability of Insulin Lispro

21-May-2015 | Gauri P. Misra, Dileep R. Janagam, Tao L. Lowe, Macromolecular Symposia, 2015

Summary The effects of polymers hyaluronic acid (anionic), chitosan (cationic), and Pluronic F‐127 (nonionic) on the stability of the insulin lispro in PBS (pH 7.4) solution at 37°C was investigated using ultra‐performance liquid chromatography. The results were that hyaluronic acid slightly ...

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Synthesis and characterization of benzimidazolium‐functionalized polysulfones as anion‐exchange membranes

21-May-2015 | María Teresa Pérez‐Prior, Alejandro Várez, Belén Levenfeld, Journal of Polymer Science Part A: Polymer Chemistry, 2015

ABSTRACT Anion‐exchange membranes containing pendant benzimidazolium groups were synthesized from polysulfone by chrolomethylation followed by nucleophilic substitution reaction with 1‐methylbenzimidazole. The structures of the polymers were characterized by 1H‐NMR and FTIR analysis. The ...

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Temperature-Induced Assembly of Monodisperse, Covalently Cross-Linked, and Degradable Poly(N-isopropylacrylamide) Microgels Based on Oligomeric Precursors

21-May-2015 | Daryl Sivakumaran; Eva Mueller; Todd Hoare, Langmuir, 2015

A simple, rapid, solvent-free, and scalable thermally driven self-assembly approach is described to produce monodisperse, covalently cross-linked, and degradable poly(N-isopropylacrylamide) (PNIPAM) microgels based on mixing hydrazide (PNIPAM-Hzd) and aldehyde (PNIPAM-Ald) functionalized PNIPAM ...

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Influence of Backbone Fluorination in Regioregular Poly(3-alkyl-4-fluoro)thiophenes

21-May-2015 | Zhuping Fei; Pierre Boufflet; Sebastian Wood; Jessica Wade; John Moriarty; Eliot Gann; Erin L. Ratcliff; Christopher ..., Journal of the American Chemical Society, 2015

We report two strategies toward the synthesis of 3-alkyl-4-fluorothiophenes containing straight (hexyl and octyl) and branched (2-ethylhexyl) alkyl groups. We demonstrate that treatment of the dibrominated monomer with 1 equiv of alkyl Grignard reagent leads to the formation of a single ...

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Boron subphthalocyanine polymers: Avoiding the small molecule side product and exploring their use in organic light‐emitting diodes

20-May-2015 | Benoît H. Lessard, Kathleen L. Sampson, Trevor Plint, Timothy P. Bender, Journal of Polymer Science Part A: Polymer Chemistry, 2015

ABSTRACT In this study, we set out the steps to efficiently synthesize boron subphthalocyanine (BsubPc)‐containing polymers while circumventing the formation of a known side product. The synthesis was achieved using the post‐polymerization coupling reaction of a carboxylic acid functional ...

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Strong Selective Adsorption of Polymers

20-May-2015 | Ting Ge; Michael Rubinstein, Macromolecules, 2015

A scaling theory is developed for selective adsorption of polymers induced by the strong binding between specific monomers and complementary surface adsorption sites. By “selective” we mean specific attraction between a subset of all monomers, called “sticky”, and a subset of surface sites, ...

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Multidetector‐ThF3 as a Novel Tool for the Investigation of Solution Properties of Amphiphilic Block Copolymers

19-May-2015 | Nyashadzashe Ngaza, Margaretha Brand, Harald Pasch, Macromolecular Chemistry and Physics, 2015

In this study, multidetector Thermal FFF (ThF3) is utilized to study amphiphilic block copolymers in different selective and nonselective solvents. Depending on the solvent quality and the polymer concentration, amphiphilic block copolymers can form aggregates or micelles; the blocks can adopt ...

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Self-Activation of Poly(methylenelactide) through Neighboring-Group Effects: A Sophisticated Type of Reactive Polymer

19-May-2015 | Judita Britner; Helmut Ritter, Macromolecules, 2015

The present work reports on a reinvestigation of a radical polymerizable lactide derivative since the polymerization properties were only poorly studied in the first publication in 1969. The optically active methylenelactide was polymerized by free radical polymerization in solution using AIBN as ...

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Tunable Encapsulation Structure of Block Copolymer Coated Single-Walled Carbon Nanotubes in Aqueous Solution

15-May-2015 | Youngkyu Han; Suk-kyun Ahn; Zhe Zhang; Gregory S. Smith; Changwoo Do, Macromolecules, 2015

Nanosized and shape-tunable molecular building blocks can provide great opportunities for the fabrication of precisely controlled nanostructures. In this work, we have fabricated a molecular building block of single-walled carbon nanotubes (SWNTs) coated by PPO–PEO–PPO block copolymers whose ...

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Chain Trajectory and Crystallization Mechanism of a Semicrystalline Polymer in Melt- and Solution-Grown Crystals As Studied Using 13C–13C Double-Quantum NMR

06-May-2015 | You-lee Hong; Tadanori Koga; Toshikazu Miyoshi, Macromolecules, 2015

The re-entrance sites, successive chain-folding number ⟨n⟩, and chain-folding fraction ⟨F⟩ of the chain-folding (CF) structure of 13C CH3-labeled isotactic poly(1-butene) (iPB1) with an weight-averaged molecular weight (⟨Mw⟩ = 37 K g/mol) in solution- and melt-grown crystals as a function of ...

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