893 resultados para Bibel, Levitikus, 13,2-46
Resumo:
The structural parameters of the aggregated state in the polyamide PA1010 and N,N'-bismaleimide-4,4'-diphenyl methane (BMI) system were computed by means of the desmearing intensity from SAXS and using the concept of the distance distribution function. The results revealed that the parameters Q, I(0), l(c) and L decreased with the increase BMI component, whereas O-s increased. The particle dimension Z for different BMI contents was less than 13.2 nm, and the maximum value of the distance distribution function P(Z) was found to be in the range Z = 6.5-7.0 nm.
Resumo:
合成了HPW12、HSiW12杂多酸的一系列铯盐:CsxH3-xPW12(x=0~3),CsxH4-xSiW12(x=0~4).测定了它们的酸强度、pH滴定曲线、NH3-TPD、IR光谱和比表面积.以乙酸和正丁醇的酯化为探针反应,考察了催化剂的酸催化活性.实验发现,碱金属取代后,PW12系列的多数催化剂的酸强度提高,而SiW12系列的则降低,但对同一系列来说,由NH3-TPD测得的酸强度和酸量均随取代量增加而减小,pH滴定的结果与此类似,当x=2.5时,两系列催化剂的比表面积均存在一个极值.对乙酸和正丁醇的催化酯化活性只与总酸量有关,与表面积无关,属假液相反应.
Resumo:
不同联苯含量的PEEKK-PEBEKK共聚物的DSC结果表明,随着联苯含量的增加,共聚物的玻璃化转变温度几逐渐升高;共聚物的熔点Tm明显地依赖于联苯含量,当联苯含量nB=0.35时,Tm值最4小。热处理可以显著地改善共聚物的结晶性,并出现熔融重结晶双峰。
Resumo:
含4,4'-二羟基二苯酮热致液晶四元共聚酯的合成与表征董德文,韩平,倪玉山,丁孟贤,韩伟(中国科学院长春应用化学研究所长春130022)(吉林化工学院化工系吉林)关键词 热致液晶,共聚酯,向列型,二羟基二苯酮关于热致液晶芳香族聚酯的研究已有大量的报道...
Resumo:
钼钒酸铋体系催化剂上丙烷的选择氧化反应李静,宋伟,窦伯生(中国科学院长春应用化学研究所长春130022)关键词丙烷,选择氧化,钼钒酸铋,助剂,丙烯醛合理利用天然气及石油裂解气为人们所关注。由于烷烃较相应烯烃反应活性低,使其在工业上的应用远不及烯烃,相...
Resumo:
光固化聚酯丙烯酸氨基甲酸酯树脂的合成及其性质黄景琴,田禾,孝延文,杨振华,陈文启(中国科学院长春应用化学研究所长春130022)关键词 光固化树脂,齐聚物,丙烯酸氨基甲酸酯,合成为了降低污染和减少能耗,非溶剂型树脂被广泛地用作涂料、粘接剂、绝缘材料等...
Resumo:
多组分氧化物Ag-Bi-V-Mo-O催化作用的光电子能谱研究宋伟,李静,窦伯生(中国科学院长春应用化学研究所长春130022)关键词 钼钒酸铋,助剂Ag,XPS,Ar~+刻蚀,氧化还原对于烃类选择氧化反应中复合氧化物的催化作用,普遍认为是Redox机...
Resumo:
掺杂元素的Lewis酸强度对掺杂In_2O_3电性质的影响文世杰G.Campet(LawrenceBerkeleyLaboratory,BerkeleyCA94720,USA)(LaboratoiredeChemieduSolideduCNRS,Uni...
Resumo:
铬离子取代对LaGa_(1-x)Cr_xO_3性质的影响杨健美,苏锵(中国科学院长春应用化学研究所稀土化学与物理开放实验室长春130022)关键词铬离子,取代,LaGa_(1-x)Cr_xO_3,镓酸镧,稀土化合物含过渡元素的ABO3型复合氧化物的许多性质...
Resumo:
研究了侧链含羧基的聚乙烯醇胺肟螯合纤维吸附金的性能。结果表明,该纤维对金的吸附具有较高的选择性,可以用于金的分离和分析。
Resumo:
It is found that there is a linear relationship between log P-w, and the parameter term V-f/0.5 E(coh) [1+(delta(w) - delta(p))(2)/delta(p)(2), from the water permeability (P-w) data of 21 polymers covering 4 orders of magnitude. This correlation may be useful in choosing membrane materials for dehumidification of gases.
Resumo:
By using Pillips and van Vechten theory, the chemical bond parameters and dielectric constants of REM (RE=rare earth, M=N, P, As, Sb) crystals were calculated. The values calculated of dielectric constants agree with the experimental values.
Resumo:
The differences between the solvent extraction of Tb(III) and Tb(IV) periodate complexes with quaternary amine were studied carefully for the first time. The effects of extractant concentration, phase ratio, the pH value of stock solution, salting-out agent, extractant form, diluent, and extraction time were comprehensively investigated. Under optimal conditions the separation factor between Tb(IV) and Tb(III) periodate complexes is over 5.5.
Resumo:
合成了一种新型异核双金属离子对配合物[Mo(dtc)_4]·[Nd(dtc)_4],并通过X-射线衍射法和元素分析确定了其晶体结构和分子结构,在此基础上,经红外光潜分析确定了该配合物的谱学性质。
Resumo:
The crystal structures of Ln(NO3)(3)(Ln = Eu,Lu) complexes with 16-crown-5 are reported. In [Eu(NO3)(2)(CH3CN)(16-crown-5)][Eu(NO3)(4)(H2O)2].1/2(16-crown-5) one Eu-III ion is coordinated to two bidentate nitrate ions, one acetonitrile molecule and five o