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A Polymer-Brush-Based Nanovalve Controlled by Nanoparticle Additives: Design Principles

21-Aug-2015 | Rob D. Coalson; Afshin Eskandari Nasrabad; David Jasnow; Anton Zilman, Journal of Physical Chemistry B, 2015

Polymer-grafted surfaces and channels are increasingly used for the design of responsive materials and sensors due to robust performance and ease of use. Various strategies for the control of the nanoscale morphologies of such materials and devices are being tested. Entropic repulsion between the ...


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 ...


Rapid and Facile Formation of P3HT Organogels via Spin Coating: Tuning Functional Properties of Organic Electronic Thin Films

18-Aug-2015 | Cameron S. Lee, Wen Yin, Adam P. Holt, Joshua R. Sangoro, Alexei P. Sokolov, Mark D. Dadmun, Advanced Functional Materials, 2015

Poly(3‐hexyl thiophene) (P3HT) is widely regarded as the benchmark polymer when studying the physics of conjugated polymers used in organic electronic devices. P3HT can self‐assemble via π–π stacking of its backbone, leading to an assembly and growth of P3HT fibrils into 3D percolating ...


Random photografting of polymers to nanoparticles for well‐dispersed nanocomposites

17-Aug-2015 | Adam W. Hauser, Ryan C. Hayward, Journal of Polymer Science Part B: Polymer Physics, 2015

ABSTRACT A simple method to achieve dispersion of nanoparticles (NPs) within polymer matrices by solution‐state photografting of benzophenone (BP)‐containing random copolymers is presented. A benzyl ether ligand that stabilizes NPs in solution while possessing selectivity toward hydrogen ...


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 ...


Biocompatible and Flexible Chitosan‐Based Resistive Switching Memory with Magnesium Electrodes

14-Aug-2015 | Niloufar Raeis Hosseini, Jang‐Sik Lee, Advanced Functional Materials, 2015

A flexible and transparent resistive switching memory based on a natural organic polymer for future flexible electronics is reported. The device has a coplanar structure of Mg/Ag‐doped chitosan/Mg on plastic substrate, which shows promising nonvolatile memory characteristics for flexible memory ...


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 ...


In the Bottlebrush Garden: The Structural Aspects of Coordination Polymer Phases formed in Lanthanide Extraction with Alkyl Phosphoric Acids

13-Aug-2015 | Ross J. Ellis; Thomas Demars; Guokui Liu; Jens Niklas; Oleg G. Poluektov; Ilya A. Shkrob, Journal of Physical Chemistry B, 2015

Coordination polymers (CPs) of metal ions are central to a large variety of applications, such as catalysis and separations. These polymers frequently occur as amorphous solids that segregate from solution. The structural aspects of this segregation remain elusive due to the dearth of the ...


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