简介：Inthispaper,theradiationgraftcopolymerofMgO,SiO2andY-molecularsieveontoorganiccompounds,suchasmethacrylate,styreneandacrylomitrileobtainedbyper-radiationmethodwerecharacterizedbyX-raydiffraction,pyrolysisgaschromatography,GPCandX-rayphotoelectronspectroscopy.

简介：Polymerboundpalladium(Pd)complexcatalystswithgraftingacrylonitrileoninorganiccompound(MgO,Y-molecularsieveandSiO2)bypre-radiationmethodwerestudies.Thepalladium-graftingpolymershavebeeninvestigatedbyX-rayphotoelectronspectrscopy(XPS).ItisindicatedthatpeakwidthofC1sandO1sspectraofMgO-g-PAN-Pd(radiation-inducedgraft)iswiderthanthatofMgO-PAN-Pd(chemicalmethod)andPeaknumbersofformerareonemorethanlater.Accordingtothereportinreference,thispeakisattributedto-O-Cgroup.Thus,thegraftacrylonitrileonMgOmaycompletethroughoxygenatomsimMgOandβ-carbonatomsinacrylonitrile.Thepolymercatalystobtainedbyradiationgraftingisahigheractivehydrogenationcatalystforolefinesandbetterantioxicthanthatofoneobtainedbychemicalmethod,andithasselectivityforhydrogenationcatalyst.

简介：TiCl_4/MgCl_2/claycompoundcatalystwaspreparedbychemicalreaction.Exfoliatedpolypropylene(PP)/claynanocompositesweresynthesizedbyinsitupolymerizationwiththiscompoundcatalyst.Effectsofpolymerizationtemperature,polymerizationtime,propylenepressure,solventconsumptionandpre-treattimeofcatalystoncatalystactivityandcatalyticstereospecificitywerestudied.Underoptimalconditions,activityofthenano-compoundcatalystisabout88.3kg/(molTi·h).IsotacticityofPPobtainedinthenanocompositesisintherangeof89%-99%,anditsmeltingtemperatureisabout159℃.Theweight-averagemolecularweightofPPcanreach6.7×10~5-7.8×10~5,andthemolecularweightdistributionisbetween7.7and7.9.

简介：Efficientdeep-redorganiclight-emittingdiodes(OLEDs)wereinvestigatedbasedontheblendofpoly[2-methoxy-5-(2'-ethyl-hexyloxy)-l,4-phenylenevinylene](MEH-PPV)with4,7-bis(5-(7-(9H-carbazol-9-yl)-9,9-dioctyl-9H-fluoren-2-yl)thiophen-2-yl)benzo[c][1,2,5]thiadiazole(compound1).Byoptimizingtheblendratio,theturn-onvoltageofthedeviceswassignificantlyreducedfrom4.9Vto2.4V.Ahighestexternalquantumefficiencyof2.56%wasachievedatablendratioof95:5(wt)forcompound1:MEH-PPV.TheCIEcoordinatewasmeasuredtobe(0.70,0.30),withtheluminescencepeakataround680nm.Basedonexperimentalobservationstheimprovementmechanismisdescribed.