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您现在的位置:欢乐时时彩 > 资料 > sulfide 的搜索结果 共有结果108,当前从第21条到第30条,本次搜索耗时0.0311131
 
Morphology, nonisothermal crystallization behavior, and kinetics of poly(phenylene sulfide)/polycarbonate blend
The morphology and nonisothermal crystallization behavior of blends made of poly(phenylene sulfide) (PPS), with a amorphous polycarbonate (PC) were studied. The blend is found to be partially miscible by the dynamic mechanical thermal analysis (DMTA) and melt rheological measurements. The nonisothermal crystallization behavior of blend was studied by differential scanning calorimetry (DSC). The re...
http://www.stageastar.comt//ss/zhangming/publicationsshow_10686.html
 
Poly(phenylene sulfide) magnetic composites. II. Crystallization, thermal, and viscoelastic properties
Poly(phenylene sulfide)/ferrosoferric oxide composites (PPS/Fe3O4) with various loading levels were prepared by melt compounding. The crystallization, thermal, and viscoelastic properties were characterized respectively by the DSC, DMA, TGA and parallel plate rheometer. The results reveal that the well-dispersed Fe3O4 particle restricts the segmental motion of polymer chain, leading to a remarkabl...
http://www.stageastar.comt//ss/zhangming/publicationsshow_10669.html
 
Effect of epoxy resin on the thermal behaviors and viscoelastic properties of poly(phenylene sulfide)
In this work, thermal behaviors and viscoelasticity of the PPS/epoxy resin mixtures prepared by melt mixing were studied, and the rheology was used as a tool to further explore the relation between chain structures and properties of the mixtures. The results show that the epoxy resin can promotes degradation and branching of the PPS during melt mixing due to its poor thermal stability. The formati...
http://www.stageastar.comt//ss/zhangming/publicationsshow_10600.html
 
Poly(monothiocarbonate)s from the Alternating and Regioselective Copolymerization of Carbonyl Sulfide with Epoxides
CONSPECTUS: Carbonyl sulfide (COS) is an air pollutant that causes acid rain, ozonosphere damage, and carbon dioxide (CO2) generation. It is a heterocumulene and structural analogue of CO2. Relevant to organic synthesis, it is a source of C=O or C=S groups and thus an ideal one-carbon (C1) building block for synthesizing sulfur-containing polymers through the simila...
http://www.stageastar.comt//ss/xhzhang/publicationsshow_9761.html
 
Synthesis of cyclic monothiocarbonates via the coupling reaction of carbonyl sulfide (COS) with epoxides
Two guanidine bases were used as organocatalysts for the synthesis of cyclic monothiocarbonates via the coupling reaction of carbonyl sulfide (COS) and epoxides. The systems proved to be efficient singlecomponent, metal-free catalysts for the reaction of simple (propylene oxide, 1,3-butene oxide) or activated epoxides (epichlorohydrin, glycidyl phenyl ether) with COS under solvent...
http://www.stageastar.comt//ss/xhzhang/publicationsshow_8990.html
 
Highly regioselective and alternating copolymerization of carbonyl sulfide with phenyl glycidyl ether
Abstract: Polymer structures containing sulfur atoms can provide enhancement of important polymer properties compared to their oxygen-containing counterparts. In this regard, the copolymerization of phenyl glycidyl ether and carbonyl sulfide has been very effectively achieved employing (salen)CrCl in the presence of an onium salt at ambient temperature. The resulting copolymer is ...
http://www.stageastar.comt//ss/xhzhang/publicationsshow_8743.html
 
An Examination of the Steric and Electronic Effects in the Copolymerization of Carbonyl Sulfide and Styrene Oxide
The completely alternating copolymerization of carbonyl sulfide (COS) and styrene oxide was found to occur under mild reaction conditions (0-30 °C and 1.5 MPa) in the presence of (salen)CrCl/onium salt catalyst systems to afford high molecular weight poly(monothiocarbonates) with narrow molecular weight distributions. Ring-opening of styrene oxide was shown to be 88% selective&nb...
http://www.stageastar.comt//ss/xhzhang/publicationsshow_8599.html
 
Regioselective and Alternating Copolymerization of Carbonyl Sulfide with Racemic Propylene Oxide
We report the first example of a regioregular and fully alternating poly (propylene monothiocarbonate) (PPMTC) from the well-controlled copolymerization of two asymmetric monomers, carbonyl sulfide and racemic propylene oxide, using (Salen)CrCl in conjunction with bis(triphenylphosphoranylidene)ammonium chloride. The maximum turnover of frequency of this catalyst system was 332 h-1 at 25 °C. Th...
http://www.stageastar.comt//ss/xhzhang/publicationsshow_5566.html
 
A Facile Chemical Route to Semiconductor Metal Sulfide Nanocrystal Superlattices
We report a facile chemical route for the synthesis of monodisperse nanocrystals of various metal sulfides (PbS, Cu2S, and Ag2S) and their assemblies into nanocrystal superlattices (NCSs); the sulfides NCSs were precipitated by adding ethanol to nanocrystal colloids, which were obtained directly by a reaction between metal thiolate and thioacetamide in a pure dodecanethiol solvent.
http://www.stageastar.comt//ss/liuzhaoping/publicationsshow_2855.html
 
Low-temperature Synthesis and Growth Mechanism of Uniform Nanorods of Bismuth Sulfide
A low-temperature solution-phase method has been demonstrated for the synthesis of uniform nanorods of Bi2S3 with diameter of 18 nm and length of below 200 nm. Transmission electron microscopy (TEM), selected-area electron diffraction (SAED), and X-ray diffraction (XRD) studies revealed that these nanorods were grown from a colloidal dispersion of amorphous Bi2S3 particles, which was fir...
http://www.stageastar.comt//ss/liuzhaoping/publicationsshow_2852.html
 
 
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