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Order–Order Morphological Transitions for Dual Stimulus Responsive Diblock Copolymer Vesicles

28-Jan-2016 | Joseph R. Lovett; Nicholas J. Warren; Steven P. Armes; Mark J. Smallridge; Robert B. Cracknell, Macromolecules, 2016

A series of non-ionic poly(glycerol monomethacrylate)–poly(2-hydroxypropyl methacrylate) (PGMA–PHPMA) diblock copolymer vesicles has been prepared by reversible addition–fragmentation chain transfer (RAFT) aqueous dispersion polymerization of HPMA at 70 °C at low pH using a carboxylic acid-based ...

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Quaternized Chitosan/Poly(acrylic acid) Polyelectrolyte Complex Hydrogels with Tough, Self-Recovery, and Tunable Mechanical Properties

27-Jan-2016 | Jun You; Shuyi Xie; Jinfeng Cao; Hao Ge; Min Xu; Lina Zhang; Jinping Zhou, Macromolecules, 2016

Quaternized chitosan (QCh) was homogeneously synthesized by reacting chitosan with 3-chloro-2-hydroxypropyltrimethylammonium chloride (CHPTAC) in alkali/urea aqueous solution for the first time. The structure and solution properties of QCh were characterized by using element analysis, FT-IR, 13C ...

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Toward Understanding of Branching in RAFT Copolymerization of Methyl Methacrylate through a Cleavable Dimethacrylate

26-Jan-2016 | Shaoning Liang; Xiaohui Li; Wen-Jun Wang; Bo-Geng Li; Shiping Zhu, Macromolecules, 2016

We report the reversible addition–fragmentation chain transfer (RAFT) solution copolymerization of methyl methacrylate (MMA) with a cleavable divinyl comonomer, bis(2-methacryloyl)oxyethyl disulfide (BMAODS). 2-Cyano-2-propyldodecyl trithiocarbonate was used as a RAFT chain transfer agent and ...

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Enhancing the Electrospinnability of Low Molecular Weight Polymers Using Small Effective Cross-Linkers

25-Jan-2016 | Xiaoxiao Wang; Christian Pellerin; C. Geraldine Bazuin, Macromolecules, 2016

The electrospinning of continuous fibers normally requires the presence of a network of topological entanglements in solution, limiting the spinnability of low molecular weight polymers. Here, we show that a supramolecular approach can improve, and even render possible, the electrospinning of low ...

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A Comparison of the Rheological and Mechanical Properties of Isotactic, Syndiotactic, and Heterotactic Poly(lactide)

21-Jan-2016 | Love-Ese Chile; Parisa Mehrkhodavandi; Savvas G. Hatzikiriakos, Macromolecules, 2016

A series of poly(lactide) (PLA) samples, exhibiting various levels of syndiotactic enrichment, were formed via the ring-opening polymerization of meso-lactide using two families of dinuclear indium catalysts: (RR/RR)-[(NNO)InCl]2(μ-Cl)(μ-OEt) (1) and (RR/RR)-[(ONNO)In(μ-OEt)]2 (2). Isotactic and ...

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Influence of Binary Polymer Mixtures on the Nonlinear Growth Regimes of Polyelectrolyte Multilayer Films

19-Jan-2016 | Malte Paßvogel; Peter Nestler; Ralf Köhler; Olaf Soltwedel; Christiane A. Helm, Macromolecules, 2016

We report on ellipsometric studies of the nonlinear growth regimes of electrostatically assembled polyelectrolyte multilayer films under in situ conditions. Poly(styrenesulfonate) (PSS) and poly(diallylmethylammonium) (PDADMA) with different molecular weights in 0.1 mol/L NaCl are used. Always, ...

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Conformation Transitions of Thermoresponsive Dendronized Polymers across the Lower Critical Solution Temperature

19-Jan-2016 | Cheng Zhang; Hui Peng; Wen Li; Lianxiao Liu; Simon Puttick; James Reid; Stefano Bernardi; Debra J. Searles; Afang Zh ..., Macromolecules, 2016

Thermoresponsive dendronized polymers, displaying remarkable phase behavior, are currently being studied for their potential exploitation as polymeric sensors and biomaterials. Understanding the conformational transitions occurring at the LCST is essential for improved design and translation of ...

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Luminescent Main-Chain Organoborane Polymers: Highly Robust, Electron-Deficient Poly(oligothiophene borane)s via Stille Coupling Polymerization

14-Jan-2016 | Xiaodong Yin; Fang Guo; Roger A. Lalancette; Frieder Jäkle, Macromolecules, 2016

A series of polymers (PBnT, n = 2–5) with boron atoms incorporated into the conjugated polythiophene main chain have been prepared via Pd-catalyzed coupling of stannylated thienylborane monomers. The polymers exhibit excellent long-term chemical stability to air and moisture and remarkable ...

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Synthesis and Photophysical and Electroluminescent Properties of Poly(1,4-phenylene–ethynylene)-alt-poly(1,4-phenylene–vinylene)s with Various Dissymmetric Substitution of Alkoxy Side Chains

14-Jan-2016 | Nassima Bouguerra; Aleš Růžička; Christoph Ulbricht; Christina Enengl; Sandra Enengl; Veronika Pokorná; Drahomír Výp ..., Macromolecules, 2016

The synthesis and characterization of a set of conjugated polymers, poly(1,4-phenylene–ethynylene)-alt-poly(1,4-phenylene–vinylene)s (PPE–PPVs), with a dissymmetrical configuration (partial or total) of alkoxy side chains is reported. Five new polymers bearing octyloxy and/or octadecyloxy side ...

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Toward an Effective Control of DNA’s Submolecular Conformation on a Surface

13-Jan-2016 | Aleksandre Japaridze; Dusan Vobornik; Ewelina Lipiec; Andrea Cerreta; Jacek Szczerbinski; Renato Zenobi; Giovanni Di ..., Macromolecules, 2016

DNA adopts different conformations based on its environment. We reveal conditions that either preserve the DNA’s physiological B-conformation, even upon its placement in UHV, or lead to a partial B-form to A-form reorganization upon DNA’s deposition on a surface. We use high-resolution AFM to ...

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