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5,853 Newest Publications about the topic molecular weight

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Synthesis via ATRP, kinetics study and characterization (molecular‐morphological) of 3‐Arm star diblock copolymers of the (PS‐b‐P2VP)3 type

18-10-2014 | George Polymeropoulos, Dimitrios Moschovas, Anastasia Kati, Apostolos Karanastasis, Styliani Pelekanou, Panagiotis C ..., Journal of Polymer Science Part A: Polymer Chemistry, 2014

ABSTRACT The synthesis of five homopolymers (PS)3 and the corresponding diblock copolymer 3‐arm stars of the (PS‐b‐P2VP)3 type is reported through atom transfer radical polymerization. Such star homo‐ and copolymers are prepared without any addition of solvent (bulk polymerization). The ...

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Effect of a chain extender on the properties of poly(lactic acid)/zinc oxide/copper chlorophyll acid antibacterial nanocomposites

18-10-2014 | Weihua Fan, Yue Zhao, Aijing Zhang, Yukun Liu, Yanxia Cao, Jinzhou Chen, Journal of Applied Polymer Science, 2014

ABSTRACT Poly(lactic acid) (PLA)/nano zinc oxide/copper chlorophyll acid (CCA) antibacterial nanocomposites with excellent mechanical properties were prepared in the presence of a chain extender named tolylene diisocyanate (TDI). The effect of the chain extender on the PLA long chain was ...

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Preparation of enduringly antifouling PVDF membrane with compatible zwitterionic copolymer via thermally induced phase separation

18-10-2014 | Kai Tu, Peng Shen, Jian Li, Bo Fan, Changyu Yang, Ruxu Du, Journal of Applied Polymer Science, 2014

ABSTRACT The compatible zwitterionic copolymers of poly(methyl methacrylate [3‐(methacryloylamino)propyl]dimethyl(3‐sulfopropyl)ammonium‐hydroxide) p(MMA‐MPDSAH) with different MPDSAH ratio are synthesized by free radical polymerization. A serial of copolymers are obtained successfully with ...

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A Pragmatic Calcium‐based Initiator for the Synthesis of Polycaprolactone Copolymers

18-10-2014 | John M. Colwell, Edeline Wentrup‐Byrne, Graeme A. George, François Schué, Polymer International, 2014

Abstract A mechanistic and kinetic study of the ring‐opening polymerisation of ε‐caprolactone (CL) in the presence of a poly(ethylene glycol) (PEG)/calcium hydride (CaH2) co‐initiation system was conducted in the bulk over a range of polymerisation temperatures (70–133 °C). Resultant ...

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Which Three-Dimensional Characteristics Make Efficient Inhibitors of Protein–Protein Interactions?

17-10-2014 | Mélaine A. Kuenemann; Laura M. L. Bourbon; Céline M. Labbé; Bruno O. Villoutreix; Olivier Sperandio, Journal of Chemical Information and Modeling, 2014

The specific properties of protein–protein interactions (PPI) (flat, large and hydrophobic) make them harder to tackle with low-molecular-weight compounds. Learning from the properties of successful examples of PPI interface inhibitors (iPPI) at earlier stages of developments, has been pinpointed ...

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Transformation of Iopamidol during Chlorination

17-10-2014 | Friedrich M. Wendel; Christian Lütke Eversloh; Edward J. Machek; Stephen E. Duirk; Michael J. Plewa; Susan D. Richar ..., Environmental Science & Technology, 2014

The transformation of the iodinated X-ray contrast media (ICM) iopamidol, iopromide, iohexol, iomeprol, and diatrizoate was examined in purified water over the pH range from 6.5 to 8.5 in the presence of sodium hypochlorite, monochloramine, and chlorine dioxide. In the presence of aqueous ...

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Characterization of Polar Organosulfates in Secondary Organic Aerosol from the Green Leaf Volatile 3-Z-Hexenal

17-10-2014 | Mohammad Safi Shalamzari; Ariane Kahnt; Reinhilde Vermeylen; Tadeusz E. Kleindienst; Michael Lewandowski; Filip Cuyc ..., Environmental Science & Technology, 2014

Evidence is provided that the green leaf volatile 3-Z-hexenal serves as a precursor for biogenic secondary organic aerosol through the formation of polar organosulfates (OSs) with molecular weight (MW) 226. The MW 226 C6–OSs were chemically elucidated, along with structurally similar MW 212 ...

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Synthesis of High‐Molecular‐Weight Brush Polymers via RAFT Polymerization within the Micellar Nanoreactor of a PEG‐Based Macromonomer

16-10-2014 | Na Li, Weiwei Liu, Lijian Xu, Jianxiong Xu, Jingjing Du, Macromolecular Chemistry and Physics, 2014

The RAFT polymerization of an amphipathic PEG‐based macromonomer (mPEG‐g‐S) in water is performed. It is found that the polymerization proceeds via a micellar polymerization process. The polymerization kinetics, polymer chain extension, and polymer particle evolution of RAFT micellar ...

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Optimisation of production yield by ultrasound‐/microwave‐assisted acid method and functional property of pectin from sugar beet pulp

16-10-2014 | Xiao‐Yan Peng, Tai‐Hua Mu, Miao Zhang, Hong‐Nan Sun, Jing‐Wang Chen, Ming Yu, International Journal of Food Science & Technology, 2014

Summary Response surface methodology was used to optimise pectin recovery from sugar beet pulp using ultrasound‐/microwave‐assisted acid method (UMAAM). The independent variables were microwave heating temperature, microwave heating time and solid‐to‐liquid ratio. From the results, the ...

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Oligosaccharide production by hydrolysis of polysaccharides: a review

16-10-2014 | Fernanda A. Moura, Fernanda T. Macagnan, Leila P. Silva, International Journal of Food Science & Technology, 2014

Summary Oligosaccharides are carbohydrates with a low molecular weight, which, when nondigestible, can produce bifidogenic activity and several other effects to human health. Oligosaccharides can be found naturally in foods or are produced by the synthesis from disaccharide substrates or by ...

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