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6,510 Newest Publications about the topic molecular weight

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Highly Robust Palladium(II) α‐Diimine Catalysts for Slow‐Chain‐Walking Polymerization of Ethylene and Copolymerization with Methyl Acrylate

27-Jun-2015 | Shengyu Dai, Xuelin Sui, Changle Chen, Angewandte Chemie International Edition, 2015

Abstract A series of sterically demanding α‐diimine ligands bearing electron‐donating and electron‐withdrawing substituents were synthesized by an improved synthetic procedure in high yield. Subsequently, the corresponding Pd complexes were prepared and isolated by column chromatography. These ...

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Photophysics of Molecular‐Weight‐Induced Losses in Indacenodithienothiophene‐Based Solar Cells

26-Jun-2015 | Nicola Gasparini, Athanasios Katsouras, Mamantos I. Prodromidis, Apostolos Avgeropoulos, Derya Baran, Michael Salvad ..., Advanced Functional Materials, 2015

The photovoltaic performance and optoelectronic properties of a donor–acceptor copolymer are reported based on indacenodithienothiophene (IDTT) and 2,3‐bis(3‐(octyloxy)phenyl)quinoxaline moieties (PIDTTQ) as a function of the number‐average molecular weight (Mn). Current–voltage measurements and ...

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Synthesis and characterization of polymerizable epoxy resin surfactants

26-Jun-2015 | Yue Wang, Zhipeng He, Qiong Liu, He Huang, Journal of Applied Polymer Science, 2015

ABSTRACT Polymerizable epoxy resin (PER) surfactants have been prepared from the reaction of bisphenol A epoxy resin with acrylic acid, followed by the reaction with polyethylene glycol (PEG) with different molecular weights. The reaction procedures were monitored by chemical titrations, ...

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Enhanced spin capturing polymerization: Numerical investigation of mechanism

26-Jun-2015 | Sergey V. Nikitin, Dmitriy A. Parkhomenko, Mariya V. Edeleva, Elena G. Bagryanskaya, Journal of Polymer Science Part A: Polymer Chemistry, 2015

ABSTRACT Simulation on the kinetic scheme of enhanced spin capturing polymerizations (ESCP) were performed to reveal the influence of different parameters, e.g., initiation rate, spin capturing and side reactions on the properties (the monomer conversion, degree of polymerization, ...

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A facile method to synthesize high‐molecular‐weight biobased polyesters from 2,5‐furandicarboxylic acid and long‐chain diols

26-Jun-2015 | Vasilios Tsanaktsis, George Z. Papageorgiou, Dimitrios N. Bikiaris, Journal of Polymer Science Part A: Polymer Chemistry, 2015

ABSTRACT In this study, biobased furan dicarboxylate polyesters have been prepared using 2,5‐furandicarboxylic acid (FDCA) and diols with high number of methylene groups (long‐chain diols), namely, 8, 9, 10, and 12. Because of the high boiling points of these diols, a modified procedure of the ...

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High Anionic Polymerizability of Benzofulvene: New Exo-Methylene Hydrocarbon Monomer

26-Jun-2015 | Yuki Kosaka; Susumu Kawauchi; Raita Goseki; Takashi Ishizone, Macromolecules, 2015

The anionic polymerization of benzofulvene (BF) quantitatively proceeded with various initiators, such as sec-BuLi, diphenylmethyllithium, diphenylmethylpotassium, triphenylmethyllithium, and triphenylmethylpotassium, in THF at −78 °C to give polymers having predicted molecular weights based on ...

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Mechanism of Nucleated Conformational Conversion of Aβ42

26-Jun-2015 | Ziao Fu; Darryl Aucoin; Judianne Davis; William E. Van Nostrand; Steven O. Smith, Biochemistry, 2015

Soluble oligomers and protofibrils of the Aβ42 peptide are neurotoxic intermediates in the conversion of monomeric Aβ42 into the amyloid fibrils associated with Alzheimer’s disease. Nuclear magnetic resonance and Fourier transform infrared spectroscopy, along with single-touch atomic force ...

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Enzymatic Modification of Different Lignins Through Oxidative Coupling with Hydrophilic Compounds

25-Jun-2015 | Ionita Firuta Fiţigău, Carmen Gabriela Boeriu, Francisc Peter, Macromolecular Symposia, 2015

Summary The enzymatic oxidative coupling of five technical lignins from different sources and with different molecular properties, with glucosamine and the tripeptide glycil‐tyrosyl‐glycine was studied in acetone/water mixture, using laccase as catalyst. The modified lignin was isolated and ...

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pH‐sensitive polyelectrolyte films derived from submicron chitosan/Eudragit® L 100‐55 complexes: Physicochemical characterization and in vitro drug release

24-Jun-2015 | Bojan Čalija, Snežana Savić, Danina Krajišnik, Rolf Daniels, Sonja Vučen, Bojan Marković, Jela Milić, Journal of Applied Polymer Science, 2015

ABSTRACT The objectives of this study were to prepare films from submicron chitosan/Eudragit® L100‐55 polyelectrolyte complexes (CH/EL PEC) and to assess the influence of CH molecular weight and CH/EL mass ratio on their structure and drug‐release properties. The films were obtained by a ...

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Fully biobased Poly(propylene 2,5-furan dicarboxylate) for packaging applications: excellent barrier properties as a function of crystallinity

24-Jun-2015 | Micaela Vannini; paola marchese; Annamaria Celli; Cesare Lorenzetti, Green Chemistry, 2015

High molecular weight, amorphous poly(propylene 2,5-furan dicarboxylate) has been aged at 135°C for different times. The crystal phase contributes to achieve exceptionally low oxygen transmission rate and also good impermeability to water vapors, making PPF one the most interesting fully biobased ...

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