Effects of an ionic liquid,1-n-tetradecyl-3-methylimidazolium bromide([C14MIM]Br),as a foaming additive on the foaming behavior of polypropylene(PP) by supercritical CO2 technique was reported.Mass ratio of PP/[C14MIM...Effects of an ionic liquid,1-n-tetradecyl-3-methylimidazolium bromide([C14MIM]Br),as a foaming additive on the foaming behavior of polypropylene(PP) by supercritical CO2 technique was reported.Mass ratio of PP/[C14MIM]Br up to 100∶10 was incorporated via melt blending.The melting behavior and fractured morphology of PP/[C14MIM]Br samples were investigated by differential scanning calorimetry(DSC) and scanning electron microscopy(SEM),respectively.The CO2 sorption was measured by commonly accep-ted gravimetric method.The results of DSC and CO2 sorption experiments show that [C14MIM]Br has little effect on the crystallinity,melting point and the mass uptake of CO2 of PP.SEM images reveal that [C14MIM]Br forms a well-dispersed phase,whose size increases with [C14MIM]Br content,in the PP matrix.The foamed PP/[C14MIM]Br samples exhibit close cell structure,increased cell size and decreased unfoamed region and bulk density,compared with pure PP foamed under the same saturation conditions of 155 ℃/10 MPa,indicating ionic liquid [C14MIM]Br has significant effect on the foaming behavior of PP.展开更多
The title cluster compound [WS4Cu3Br(bipy)2] has been synthesized by the reaction of (NH4)2, CuBr and 2,2′ bipy in DMF solution. Single crystal X ray diffraction data show that the compound has a nest shaped structur...The title cluster compound [WS4Cu3Br(bipy)2] has been synthesized by the reaction of (NH4)2, CuBr and 2,2′ bipy in DMF solution. Single crystal X ray diffraction data show that the compound has a nest shaped structure. Nonlinear optical properties (NLO) of the cluster were investigated by a Z scan technique with a pulsed laser at 532nm. The cluster exhibits the strong NLO absorption and a self defocusing effect (effective non linear absorption coefficient, α2eff=7.3×10-11mW-1; effective non linear refractive index, n2eff=3.9×10-11esu) when measured in a 6.0×10-4mol·dm-3 DMF solution. CCDC: 200397.展开更多
文摘Effects of an ionic liquid,1-n-tetradecyl-3-methylimidazolium bromide([C14MIM]Br),as a foaming additive on the foaming behavior of polypropylene(PP) by supercritical CO2 technique was reported.Mass ratio of PP/[C14MIM]Br up to 100∶10 was incorporated via melt blending.The melting behavior and fractured morphology of PP/[C14MIM]Br samples were investigated by differential scanning calorimetry(DSC) and scanning electron microscopy(SEM),respectively.The CO2 sorption was measured by commonly accep-ted gravimetric method.The results of DSC and CO2 sorption experiments show that [C14MIM]Br has little effect on the crystallinity,melting point and the mass uptake of CO2 of PP.SEM images reveal that [C14MIM]Br forms a well-dispersed phase,whose size increases with [C14MIM]Br content,in the PP matrix.The foamed PP/[C14MIM]Br samples exhibit close cell structure,increased cell size and decreased unfoamed region and bulk density,compared with pure PP foamed under the same saturation conditions of 155 ℃/10 MPa,indicating ionic liquid [C14MIM]Br has significant effect on the foaming behavior of PP.
文摘The title cluster compound [WS4Cu3Br(bipy)2] has been synthesized by the reaction of (NH4)2, CuBr and 2,2′ bipy in DMF solution. Single crystal X ray diffraction data show that the compound has a nest shaped structure. Nonlinear optical properties (NLO) of the cluster were investigated by a Z scan technique with a pulsed laser at 532nm. The cluster exhibits the strong NLO absorption and a self defocusing effect (effective non linear absorption coefficient, α2eff=7.3×10-11mW-1; effective non linear refractive index, n2eff=3.9×10-11esu) when measured in a 6.0×10-4mol·dm-3 DMF solution. CCDC: 200397.
