简介:Thetitlecompounds4,4'-oxobis(propham)((?)n)(C20H24N2O5,Mr.=372.41)wassynthesizedbytheadditionreactionofcorresponding4,4'-oxobisphenyldiisocyanatewithisopropanol.ThecrystalstructurewasdeterminedbyX-raydiffractionmethod.Thecrystalistriclinicsystem,spacegroupP-1witha=8.5107(17),b=9.1164(18),c=14.5701(3)A,α=80.44(3),β=85.25(3),γ=62.88(3)°,V=992.2(3)A3,Z=2,Dc=1.247g/cm3,F(000)=396,R=0.0520,wR2=0.1434for4336observedreflectionswith[I>2σ(I)].X-rayana...
简介:Inordertoexplorethefeasibilityofcryopreservationondormantforesttreeseeds,theseedviabilityof4species(Malusbaccata,Prunusdavidiana,P.armenicaandAmygdalupersica)withmoisturecontent(MC)changingwastestedafter30-daystorageinliquidnitrogenof-196℃.Theresultsshowedthatallthe4speciesofseedscankeepastableviabilityaftercryopreservation.Intheprocedure,theoptimumMCwas48g/kgforM.baccata,27g/kgforP.davidiana,31g/kgforP.armenicaand45g/kgforA.persica,...
简介:Thecorrosiveratesof4typesofmetalsaswellasepoxy-coatedmetalinavarietyofpreservativesderivedfromdifferentcoppersourcesandingredientsweremeasuredinthispaper.Themainresultsshowthat:CCAislesscorrosivetoredbrassandQ235Asteelthanothercopperformulations;Copper-basedpreservativessuchasACQandCuAzderivedfrombasiccupriccarbonateorcuprichydroxidearemuchlesscorrosivetoQ235Asteelthanthosefromcupricsulfate;EthanolamineislesscorrosivetoQ235AsteelthanammoniainACQderivedfromcuprichydroxide,whileotheringredientsarethesame;Epoxyresincoatingcouldbeusedforprotectingredbrass,Q235Asteelandzinchot-dippedgalvanizedmildsteelfromcorrosion.