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Thermo‐ and pH‐sensitive triblock copolymers with tunable hydrophilic/hydrophobic properties

26-Jun-2015 | Christophe Pottier, Gaëlle Morandi, Virginie Dulong, Zied Souguir, Luc Picton, Didier Le Cerf, Journal of Polymer Science Part A: Polymer Chemistry, 2015

ABSTRACT Polymers consisting of poly(acrylic acid) (PAA) and statistical poly[(acrylic acid)‐co‐(tert‐butylacrylate)] (P(AA‐co‐tBA)), attached to both extremities of Jeffamine® (D series based on a poly(propylene oxide) (PPO) with one amine function at each end) using atom transfer radical ...


Modification of Glass Fiber Surface and Glass Fiber Reinforced Polymer Composites Challenges and Opportunities: From Organic Chemistry Perspective

24-Jun-2015 | Liu, Zeyu; Zhang, Letao; Yu, Erlei; Ying, Zhaoming; Zhang, Yagang; Liu, Xuanchi; Eli, Wumanjiang, Organic Chemistry, 2015

Abstract: Glass fiber reinforced plastics (GFRPs) are one of the most widely used composite materials and hold great potential applications due to their high-performance and cost effectiveness. Desired interfacial adhesion are paramount important in order to achieve enhanced affinity ...


Synthesis, Characterization, and thermoresponsive properties of Helical Polypeptides Derivatized from Poly(γ−4‐(3‐chloropropoxycarbonyl)benzyl‐L‐glutamate)

23-Jun-2015 | Yong Deng, Xi Wang, Qiulin Yuan, Mengxiang Zhu, Ying Ling, Haoyu Tang, Journal of Polymer Science Part A: Polymer Chemistry, 2015

ABSTRACT A series of side‐chain‐functionalized α‐helical polypeptides, i.e., poly(γ‐4‐(3‐chloropropoxycarbonyl)benzyl‐L‐glutamate) (6) have been prepared from n‐butylamine initiated ring‐opening polymerization (ROP) of γ‐4‐(3‐chloropropoxycarbonyl)benzyl‐L‐glutamic acid‐based ...


Development of an extrusion die with rollers for foaming polymers

22-Jun-2015 | Boris V. Kichatov, Alexey M. Korshunov, Polymer Engineering and Science, 2015

Ideas concerning the use of a flat slot die with rollers in the technology of extrusion foaming of polymers are developed. Based on the experimental study of low‐density polyethylene foaming with isobutane, dependences of the cell density and foam density on the polymer solution viscosity, gap ...


Solvent Molding of Organic Morphologies Made of Supramolecular Chiral Polymers

22-Jun-2015 | Luka Đorđević; Tomas Marangoni; Tanja Miletić; Jenifer Rubio-Magnieto; John Mohanraj; Heinz Amenitsch; Dario Pasini; ..., Journal of the American Chemical Society, 2015

The self-assembly and self-organization behavior of uracil-conjugated enantiopure (R)- or (S)-1,1′-binaphthyl-2,2′-diol (BINOL) and a hydrophobic oligo(p-phenylene ethynylene) (OPE) chromophore exposing 2,6-di(acetylamino)pyridine termini are reported. Systematic spectroscopic (UV–vis, CD, ...


[Report] Long-lived photoinduced polaron formation in conjugated polyelectrolyte-fullerene assemblies

19-Jun-2015 | Rachel C. Huber; Amy S. Ferreira; Robert Thompson; Daniel Kilbride; Nicholas S. Knutson; Lekshmi Sudha Devi; Daniel ..., Science , 2015

The efficiency of biological photosynthesis results from the exquisite organization of photoactive elements that promote rapid movement of charge carriers out of a critical recombination range. If synthetic organic photovoltaic materials could mimic this assembly, charge separation and collection ...


Temperature Driven Self-Assembly of a Zwitterionic Block Copolymer That Exhibits Triple Thermoresponsivity and pH Sensitivity

16-Jun-2015 | Zulma A. Jiménez; Ryo Yoshida, Macromolecules, 2015

We report a zwitterionic block copolymer composed of N-isopropylacrylamide and N,N-dimethyl-N-(3-(methacrylamido)propyl)ammoniopropanesulfonate monomers which self-assembles into different structures depending on the solution temperature. As the temperature is increased from 20 to 70 °C, the ...


Chain‐Growth Click Polymerization of AB2 Monomers for the Formation of Hyperbranched Polymers with Low Polydispersities in a One‐Pot Process

10-Jun-2015 | Yi Shi, Robert W. Graff, Xiaosong Cao, Xiaofeng Wang, Haifeng Gao, Angewandte Chemie International Edition, 2015

Abstract Hyperbranched polymers are important soft nanomaterials but robust synthetic methods with which the polymer structures can be easily controlled have rarely been reported. For the first time, we present a one‐pot one‐batch synthesis of polytriazole‐based hyperbranched polymers with ...


Simple and green technique for sequestration and concentration of silver nanoparticles by polysaccharides immobilized on glass beads in aqueous media

09-Jun-2015 | Kibeche, Alaeddine; Dionne, Alexandre; Brion-Roby, Roxanne; Gagnon, Christian; Gagnon, Jonathan, Chemistry Central Journal , 2015

Background: Engineered nanoparticles have unique properties compared to bulk materials and their commercial uses growing rapidly. They represent a potential risk for environment and health and could be eventually released in water. Silver nanoparticles (Ag NP) are applied in various products and ...


Energy Transfer Between Squaraine Polymer Sections: From Helix to Zigzag and All the Way Back

09-Jun-2015 | Christoph Lambert; Federico Koch; Sebastian F. Völker; Alexander Schmiedel; Marco Holzapfel; Alexander Humeniuk; Mer ..., Journal of the American Chemical Society, 2015

We provide a joint experimental and theoretical study of squaraine polymers in solution. The absorption spectra show evidence that two different conformations are present in the polymer: a helix and a zigzag structure. This unique situation allows investigating ultrafast energy-transfer processes ...


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