Results 21 to 30 of about 186,604 (297)

High-Efficiency Mono-Cyclopentadienyl Titanium and Rare-Earth Metal Catalysts for the Production of Syndiotactic Polystyrene

open access: yesMolecules, 2023
Syndiotactic polystyrene (SPS) refers to a type of thermoplastic material with phenyl substituents that are alternately chirally attached on both sides of an aliphatic macromolecular main chain.
Bo Wen   +5 more
doaj   +1 more source

Ultrafast Molecular Spectroscopy Using a Hollow-Core Photonic Crystal Fibre Light Source [PDF]

open access: yes, 2018
We demonstrate, for the first time, the application of rare-gas filled hollow-core photonic crystal fibres (HC-PCFs) as tuneable ultraviolet light sources in femtosecond pump-probe spectroscopy.
Belli, Federico   +6 more
core   +2 more sources

Rhodium/phospholane-phosphite catalysts give unusually high regioselectivity in the enantioselective hydroformylation of vinyl arenes [PDF]

open access: yes, 2014
Using the phospholane-phosphite ligand, BOBPHOS, almost perfect regioselectivities and high enantioselectivities (up to 92% ee) are observed in Rh catalysed enantioselective hydroformylation of vinyl arenes.
Clarke, Matthew L.   +3 more
core   +1 more source

High molar mass segmented macromolecular architectures by nitroxide mediated polymerisation [PDF]

open access: yes, 2013
A straightforward synthetic pathway based on nitroxide mediated polymerisation (NMP) for the synthesis of a variety of high molar mass segmented copolymers comprising both polystyrene (PS) and polyether segments is reported.
Claessens, Sven   +6 more
core   +2 more sources

Synthesis of 2-Alkenyl-2H-indazoles from 2-(2-Carbonylmethyl)-2H-indazoles

open access: yesMolecules, 2016
A procedure has been developed for synthesis of 2-alkenyl-2H-indazoles starting from 2-(2-carbonylmethyl)-2H-indazoles, which are prepared by gallium/aluminium- and aluminium-mediated, direct, regioselective alkylation of indazoles with α-bromocarbonyl ...
Mei-Huey Lin   +7 more
doaj   +1 more source

Blends of styrene-butadiene-styrene triblock copolymer with random styrene-maleic anhydride copolymers [PDF]

open access: yesMacromolecular Chemistry and Physics, 2002
Blends of styrene-butadiene-styrene triblock copolymer (SBS) with random styrene-maleic anhydride copolymers (PS-co-MA), having different MA content, were prepared in a Brabender Plastigraph mixer. The presence of polystyrene (PS) blocks in the SBS copolymer and the high styrene content (93 and 86 wt.-%, respectively) in the two kinds of used PS-co-MA ...
PICCHIONI F.   +4 more
openaire   +5 more sources

Flavoprotein monooxygenases for oxidative biocatalysis: recombinant expression in microbial hosts and applications [PDF]

open access: yes, 2014
External flavoprotein monooxygenases comprise a group of flavin-dependent oxidoreductases that catalyze the insertion of one atom of molecular oxygen into an organic substrate and the second atom is reduced to water. These enzymes are involved in a great
Bianchi, Dario Alejandro   +2 more
core   +2 more sources

Random copolymer blends of styrene, para-fluoro styrene and ortho-fluoro styrene [PDF]

open access: yesPolymer, 1993
This study completes the investigation of the phase behaviour of polymer blends involving styrene (S), ortho-fluoro styrene (oFS) and para-fluoro styrene (pFS). As before, due to the proximity of the glass transition temperatures of most blends investigated, the miscibility or immiscibility is established using the alternative thermal analysis method ...
OUDHUIS, AACM, TENBRINKE, G, KARASZ, FE
openaire   +2 more sources

Influence of processing parameters and composition on the effective compatibilization of polypropylene–poly(ethylene terephthalate) blends [PDF]

open access: yes, 2016
The effects of the addition of different functionalized compatibilizers on toughness, morphology and rheological properties of a polypropylene (PP) - poly(ethylene terephthalate) (PET) (85-15 wt%) blend were studied.
Koster, Rolf   +3 more
core   +1 more source

Effects of Molecular Iodine and 4-tert-Butylcatechol Radical Inhibitor on the Radical Polymerization of Styrene [PDF]

open access: yesعلوم و تکنولوژی پلیمر, 2017
The presence of molecular iodine was studied in relation the molecular weight and molecular weight distribution of polystyrene, produced by radical poly merization.
Mojtaba Bozorg   +2 more
doaj   +1 more source

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