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Nanoscale Contact Mechanics between Two Grafted Polyelectrolyte Surfaces

27-Aug-2015 | Maryam Raftari; Zhenyu J. Zhang; Steven R. Carter; Graham J. Leggett; Mark Geoghegan, Macromolecules, 2015

The adhesive and frictional behavior of end-grafted poly[2-(dimethylamino)ethyl methacrylate] (PDMAEMA) films (brushes) in contact with atomic force microscope tips from which PDMAEMA or poly(methacrylic acid) (PMAA) were grafted has been shown to be a strong function of pH in aqueous solution. ...


Cocatalyst Binding Effects in Organocatalytic Ring-Opening Polymerization of l-Lactide

27-Aug-2015 | Oleg I. Kazakov; Matthew K. Kiesewetter, Macromolecules, 2015

Thiourea/alkylamine cocatalysts have previously been shown to be effective systems for the ring-opening polymerization (ROP) of lactide, but an experimental explanation for the varied activity and selectivity of these structurally similar alkylamine cocatalysts combined with thiourea is elusive. ...


End-Group-Mediated Aggregation of Poly(3-hexylthiophene)

19-Aug-2015 | Stephanie L. Fronk; Cheng-Kang Mai; Michael Ford; Ryan P. Noland; Guillermo C. Bazan, Macromolecules, 2015

The solid-state microstructure of semiconducting polymers is known to influence properties relevant for their function in optoelectronic devices. While several strategies exist in the literature for controlling desired morphological organization, preaggregation in solution via polymer chain ...


Electric-Field-Induced Order–Order Transition from Hexagonally Perforated Lamellae to Lamellae

19-Aug-2015 | Christian W. Pester; Kristin Schmidt; Markus Ruppel; Heiko G. Schoberth; Alexander Böker, Macromolecules, 2015

Block copolymers form a variety of microphase morphologies due to their ability to phase separate. The hexagonally perforated lamellar (HPL) morphology represents an unusually long-lived, nonequilibrium transient structure between lamellar and cylindrical phases. We present a detailed study of a ...


Molecular Crowding Increases Knots Abundance in Linear Polymers

17-Aug-2015 | Giuseppe D’Adamo; Cristian Micheletti, Macromolecules, 2015

Stochastic simulations are used to study the effects of molecular crowding on the self-entanglement of linear polymers. We consider flexible chains of beads of up to 1000 monomers and examine how their knotting properties vary in the presence spherical crowders that are 4 times smaller than the ...


Effect of Halogenation in Isoindigo-Based Polymers on the Phase Separation and Molecular Orientation of Bulk Heterojunction Solar Cells

14-Aug-2015 | Yu-Qing Zheng; Zhi Wang; Jin-Hu Dou; Shi-Ding Zhang; Xu-Yi Luo; Ze-Fan Yao; Jie-Yu Wang; Jian Pei, Macromolecules, 2015

Fluorinated and chlorinated isoindigo-based polymers, F-IIDT and Cl-IIDT, were developed as the donor materials for photovoltaic cells. Although showing similar frontier orbital energy levels, both polymers exhibited distinct solar cell device performance, for example, power conversion efficiency ...


Multigeometry Nanoparticles: Hybrid Vesicle/Cylinder Nanoparticles Constructed with Block Copolymer Solution Assembly and Kinetic Control

14-Aug-2015 | Yingchao Chen; Ke Zhang; Xiaojun Wang; Fuwu Zhang; Jiahua Zhu; Jimmy W. Mays; Karen L. Wooley; Darrin J. Pochan, Macromolecules, 2015

We report an experimental study of the assembly of various multicompartment and multigeometry nanoparticles constructed from mixtures of two diblock copolymers. By simply blending the amphiphilic block copolymers poly(acrylic acid)-block-polyisoprene (PAA-b-PI) and poly(acrylic ...


Hyperbranched Poly(ethylene glycol) Copolymers: Absolute Values of the Molar Mass, Properties in Dilute Solution, and Hydrodynamic Homology

13-Aug-2015 | Igor Perevyazko; Jan Seiwert; Martina Schömer; Holger Frey; Ulrich S. Schubert; Georges M. Pavlov, Macromolecules, 2015

Hyperbranched poly(ethylene glycol) copolymers were synthesized by random anionic ring-opening multibranching copolymerization of ethylene oxide with glycidol as a branching agent, leading to poly(ethylene glycol) structure with glycerol branching points. Extending the available range of molar ...


Thermoswitchable Nanoparticles Based on Elastin-like Polypeptides

13-Aug-2015 | Bettina Kracke; James T. Cole; Christoph J. O. Kaiser; Björn Hellenkamp; Stefanie Krysiak; Ali Ghoorchian; Gary B. B ..., Macromolecules, 2015

The design of biocompatible particles with defined size on the nanometer scale has proven to be a challenging task in current biomedical research. Here we present an approach toward temperature-responsive nanoparticles by covalently cross-linking micelles based on trimeric constructs of ...


Exploring Different Cationic Alkyl Side Chain Designs for Enhanced Alkaline Stability and Hydroxide Ion Conductivity of Anion-Exchange Membranes

11-Aug-2015 | Hai-Son Dang; Patric Jannasch, Macromolecules, 2015

In order to systematically improve the performance of anion-exchange membranes (AEMs) for alkaline fuel cells, a series of poly(phenylene oxide)s (PPOs) was tethered with cationic alkyl side chains of different lengths and configurations. PPO was first functionalized with bromomethyl and longer ...


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