05-02-2013 | Jie Liu; Wei-Min Ren; Ye Liu; Xiao-Bing Lu, Macromolecules, 2013

Trivalent cobalt complexes of salicylaldimine in the presence of an inter- or intramolecular nucleophilic cocatalyst have proven to be excellent catalysts for the copolymerization of CO2 and epoxides to selectively afford the corresponding polycarbonates in perfectly alternating nature. ...

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01-02-2013 | Tian‐Bin Ren, Chang‐Jin Liu, Wei Wu, Kuan Ye, Wei‐Zhong Yuan, Polymer International, 2013

Abstract Novel, well‐defined A4BA4 nonlinear block copolymers [poly(ϵ‐caprolactone)]4‐block‐poly(propylene oxide)‐block‐[poly(ϵ‐caprolactone)]4 (PCL4‐b‐PPO‐b‐PCL4) with eight arms were synthesized by ring‐opening polymerization. An investigation of melting and crystallization demonstrated ...

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30-01-2013 | Monireh Aminian, Abdorreza Mohammadi Nafchi, Marzieh Bolandi, Abd Karim Alias, Starch - Stärke, 2013

Abstract The effects of etherification on properties of sago starch were investigated. Hydroxypropylated sago starch (HPSS) was prepared in basic medium in ratios ranging from 0 to 70% v/w propylene oxide to sago starch. The physicochemical, thermal, and rheological properties of HPSS ...

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19-01-2013 | Elfi Kraka, Marek Freindorf, Dieter Cremer, Chirality, 2013

ABSTRACT Chiral discrimination of homochiral and heterochiral H‐bonded complexes is a challenge for both experimentalists and computational chemists. It is demonstrated that a two‐pronged approach based on far‐infrared vibrational spectroscopy and the calculation of local mode frequencies ...

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11-01-2013 | Eneko Larrañeta; José Ramón Isasi, Langmuir, 2013

The phase behavior of two types of poly(ethylene oxide)/poly(propylene oxide) (PEO/PPO) copolymers in aqueous solutions was studied by light scattering, viscometry, and infrared spectroscopy. Both the reverse poloxamer (Pluronic 10R5) and the star type poloxamine (Tetronic 90R4) have ...

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09-01-2013 | Jeannette Geschwind, Frederik Wurm, Holger Frey, Macromolecular Chemistry and Physics, 2013

Abstract Copolymerization of CO2 and epoxides is employed to generate functional polycarbonates. The introduction of reactive double bonds at a poly(propylene carbonate) (PPC) backbone is realized by the copolymerization of aliphatic alkene epoxides with propylene oxide (PO) and carbon ...

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07-12-2012 | Marina González-Pérez; Rafael Gómez-Bombarelli; Jorge Arenas-Valgañón; M. Teresa Pérez-Prior; M. Pilar García-Santos ..., Chemical Research in Toxicology, 2012

The chemical reactivity of the mutagenic epoxides (EP) propylene oxide (PO), 1,2-epoxybutane (1,2-EB), and cis- and trans-2,3-epoxybutane (cis- and trans-2,3-EB) with 4-(p-nitrobenzyl)pyridine (NBP), a bionucleophile model for SN2 alkylating agents with high affinity for the guanine-N7 ...

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06-12-2012 | Leonardo Chiappisi; Giuseppe Lazzara; Michael Gradzielski; Stefana Milioto, Langmuir, 2012

A novel thermodynamic approach for the description of differential scanning calorimetry (DSC) experiments on self-aggregating systems is derived and presented. The method is based on a mass action model where temperature dependence of aggregation numbers is considered. The validity of the ...

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05-12-2012 | Y. Rharbi, Macromolecules, 2012

Amphiphilic block copolymers autoassemble in water to form either dynamically active micelles or frozen particles at high surface tension. The dynamics of these systems is dominated by an individual process, which involves insertion–expulsion of copolymer chains, and a collective one, which ...

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28-11-2012 | Alisa Rudnitskaya; Dmitry V. Evtuguin; Luis C. Costa; M. Pedro F. Graça; António J. S. Fernandes; M. Rosario P. Corr ..., Analyst, 2012

Hardwood and softwood lignins obtained from industrial sulphite and kraft and laboratory oxygen-organosolv pulping processes were employed in co-polymerization with tolylene 2,4-diisocyanate terminated poly(propylene glycol). The obtained lignin-based polyurethanes were doped with 0.72 w/w% ...

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