聚氨酯/NaClO4复合物的形态和离子导电性

用原子力显微镜研究了聚氨酯／NaClO4复合物的微观形貌。结果表明,在氧钠摩尔比为12时,体系存在一个形态转变点,聚氨酯软,硬段相容性达到最佳,复合物的电导率出现最大值。     

NH4H2PO4/三聚氰胺阻燃硬质聚氨酯泡沫的性能研究

以不同质量比的NH4H2PO4和三聚氰胺作为阻燃体系加入组合聚醚中,与多亚甲基多苯基异氰酸酯混合制备阻燃硬质聚氨酯泡沫(RPUF)。采用极限氧指数测定(LOI)、物理性能测试、残炭率实验、差热扫描(DSC)等手段对阻燃RPUF进行测试分析。结果表明,当NH4H2PO4/三聚氰胺质量份为20∶5,添加质量分数25%的该复配阻燃剂时,RPUF的物理机械性能较佳,其极限氧指数为26.5,残炭率为63.0%。     

盐浓度对聚氨酯/高氯酸钠复合物微观形态的影响

制备了聚氨酯／高氯酸钠[(PGE-PU)/NaClO4]复合物，并用差示扫描量热法、热重分析、扫描电镜和原子力显微镜对其进行了分析表征。结果表明，掺杂盐浓度对（PEG－PU）／NaClO4体系的玻璃化转变温度、热分解温度和微观形态都有很大影响。随着盐浓度的升高，软段结构的热分解温度呈下降趋势，试样的玻璃化转变温度先上升，当盐浓度达到一定数值以后，玻璃化转变温度又有所下降，在盐浓度较低时，体系中聚氨酯软、硬段的相容性随着盐浓度升高而有显著提高。当醚氧基团与钠离子摩尔比为12时，体系相容性最佳，随着盐浓度进一步增加，聚合物－离子相互作用增强，体系中硬段结构出现新的聚集形态。     

TiO2在聚氨酯复合材料中的应用

TiO2具有稳定性好、无毒和不产生二次污染等特点,有着广阔的应用前景。本文介绍了TiO2粒子在聚氨酯弹性体、皮革、涂料、泡沫等复合材料中的应用进展,研究结果显示TiO2粒子能提高聚氨酯复合材料的性能。并探讨了研究过程中存在的问题及发展前景。     

钇氮改性TiO2/聚氨酯复合涂层的制备和性能研究

制备了钇氮共掺杂光催化剂TiO2,以XRD,UV-VIS,FT-IR对其进行了分析表征。表明,在500℃得到了锐钛矿型TiO2,晶粒变小。加入到聚氨酯涂料中用于甲基橙的降解实验,在紫外及可见光区均显示较强的光催化活性,降解率达到96%。     

聚氨酯/微米CaCO3复合材料的性能研究

对聚氨酯/纳米CaCO3粒子复合材料的性能进行了研究。实验表明:聚氨酯/纳米CaCO3粒子复合材料具有优异的性能,聚氨酯/纳米CaCO3粒子复合材料,其硬度、力学性能和抗冲蚀磨损性能比纯聚氨酯优异;在纳米CaCO3含量为1%时,其硬度、力学性能,抗冲蚀磨损性能最佳。     

三元复合物Ag/Cu2O/g-C3N4的制备及其光催化降解和抗菌性能研究

以尿素、硫酸铜、乙酸银为原料,采用溶液法制备了三元复合物Ag/Cu₂O/g-C₃N₄,通过XRD、XPS、SEM、TEM、UV-Vis等手段对三元复合物的结构进行了表征;以罗丹明B为模型研究了三元复合物的光催化降解性能,以大肠杆菌和金黄色葡萄球菌为模型研究了三元复合物的抗菌性能,并探究了三元复合物的光催化降解机理。结果表明,Ag和Cu₂O粒子沉积在g-C₃N₄片层结构上,Ag、Cu₂O和g-C₃N₄三者之间的协同作用使得三元复合物的光催化降解性能和抗菌性能大幅提高。为构建用于实际水体污染处理的g-C₃N₄基复合材料提供了新思路。     

Li3Zn0.5SiO4水基溶胶-凝胶法合成 及其离子导电性

用水基溶胶-凝胶法制备了锂离子导体Li     

g-C3N4/Fe3O4/MnO2光催化剂制备及光催化性能研究

以尿素和铁盐为原料,负载了MnO₂,利用原位沉淀法与煅烧法制备g-C₃N₄/Fe₃O₄/MnO₂复合材料。使用XRD、FT-IR、UV-Vis DRS对合成的部分光催化剂进行表征。结果表明：g-C₃N₄为类石墨的层状结构,Fe₃O₄和Mn O₂通过分子间作用力与g-C₃N₄复合。在不同反应条件下的可见光诱导的光催化实验表明,当m(Mn)∶m(g-C₃N₄/Fe₃O₄)=1∶1时,g-C₃N₄/Fe₃O₄/MnO₂复合材料具有出色的降解污染物的能力,其中光降解反应的优化条件为g-C₃N     

NaClO2溶液吸收烟气中的NOx的研究

利用鼓泡反应器,通过改变工艺条件,研究在NaClO₂溶液中去除模拟烟气中NOx的效果。模拟了SO₂、pH、进气流量及不同浓度的NaClO₂溶液等条件下对NOx脱除效果的影响。研究发现:提高吸收液中NaClO₂的浓度,可以促进NO的氧化吸收效率;酸性介质中NaClO₂释放的ClO₂有助于NO的氧化和NO₂的吸收;SO₂的存在对NOx的去除有促进作用;增加反应停留时间均可以有效地提高NOx的去除。     

The synthesis and photophysical property of [HNEt3][Cuq2IEu(hfac)3] complex

A new bimetallic complex [HNEt₃][Cuq₂IEu(hfac)₃] (q⁻ = 8-hydroxyquinolinato, hfac⁻ = hexafluoroacetylacetonate) was prepared simply with only one step and characterized. Upon excitation of the organic ligand q⁻, the sensitized europium luminescence was achieved.     

Enhanced mechanical property of Ca5(PO4)2SiO4 bioceramic by a biocompatible sintering aid of zinc oxide

In the present work, a biocompatible additive ZnO was used to enhance the sintering of calcium phosphate silicate (CPS)¹ bioceramic and improve its mechanical property. Sol-gel prepared CPS powders were mechanically mixed with various amount of ZnO and then sintered at high temperatures to prepare Zn-CPS bioceramics. The effects of ZnO content and sintering temperature on microstructure and bending strength of Zn-CPS bioceramics were investigated and the related mechanism was also discussed. The results showed that ZnO could significantly enhance the sintering of CPS and improve its bending strength accordingly. The Zn-CPS bioceramic with 1?wt% ZnO sintered at 1300?°C exhibited a highest bending strength of 80.8?MPa. The enhanced densification of Zn-CPS bioceramics might be attributed to the liquid phase appeared during the sintering process and the formation of Ca₂ZnSi₂O₇² (HT) nano-grains at grain boundaries. It is expected that Zn-CPS bioceramics could have both good mechanical property and excellent bioactivity.     

The structural characterization and hydroformylation activity of the tri-rhodium complex [Rh3(μ2-dppm)2(μ2-CO)3(K-CO)3]BF4

Rh₂(cod)₂(μ₂-dppm)(μ₂-Cl)]BF₄ (1) rearranges under carbon monoxide to give [Rh₃(μ₂-dppm)₂(μ₂-CO)₃(K¹-CO)₃]BF₄ (2). Complex 2 has been structurally characterized by single crystal X-ray crystallography. The hydroformylation activities of 1 and 2 were compared for substrates styrene and 1-hexene and the activity of 2 found to be unexpectedly high.     

Synthesis, crystal structure and thermal stability of tetrahydroborate sodalite Na8[AlSiO4]6(BH4)2

Tetrahydroborate sodalite formation was investigated in the system Na₂O–SiO₂–Al₂O₃–NaBH₄–H₂O under mild hydrothermal conditions. Due to the high degree of decomposition of hydroborates in aqueous solutions synthesis conditions were tuned by variation of the parameters alkalinity, liquid/solid ratio, reaction temperature and reaction time. The insertion of 8–16 molar NaOH solution was crucial for the higher stability of pure tetrahydroborate salt under strong alkaline conditions. Synthesis at 393 K and 24 h reaction time reveal tetrahydroborate sodalite Na₈[AlSiO₄]₆(BH₄)₂ beside a small amount of amorphous material within the total batch. Structure, composition and thermal stability of this new sodalite was investigated using XRD, NMR, infrared and TG/DTA methods. The crystal structure of tetrahydroborate sodalite has been refined in the space group P-43n with a = 891.61(2) pm. The Si- and Al-atoms of the aluminosilicate framework are completely ordered. The boron atoms of the tetrahydroborate anions are located at the centre of the sodalite cage whereas the hydrogen atoms are positionally disordered. Na₈[AlSiO₄]₆(BH₄)₂ shows a high stability under inert gas conditions. At atmospheric conditions the group can be oxidized to borate and boroxide anions suggesting the formation of hydrogen which leaves the sodalite cages. Future investigation of reloading properties of the oxidized form could be highly interesting for the hydrogen storage capabilities of these sodalites.     

Sr0.5Zr2(PO4)3陶瓷的力学性能研究

用共沉淀法和低分子有机溶剂分散获得SZP粉体,经干压成型和烧结得到SZP陶瓷.研究了其力学性能与烧结温度烧结时间和添加剂用量的关系.最佳工艺条件为添加MgO6wt%,1300℃或ZnO3wt%,1200℃均烧结1.5小时,SZP陶瓷的抗压强度分别可达244.0MPa和226.2MPa.     

Synthesis and physical property characterisation of phosphonium ionic liquids based on P(O)2(OR)2 and P(O)2(R)2 anions with potential application for corrosion mitigation of magnesium alloys

Phosphonium cation based ionic liquids (ILs) have become of interest due to their unique chemical and electrochemical stability as well as their promising tribological properties. At the same time, interest has also grown in the use of phosphate and phosphinate based ionic liquids for corrosion protection of reactive metals. In this work we describe the synthesis and characterization of six novel ionic liquids based on the tetraalkylphosponium cation coupled with organophosphate and organophosphinate anions and their sulfur analogues. The conductivity and viscosity of these ILs has been measured and discussed in terms of the nature of the interactions, effect of anion basicity and the extent of ionic character. The reaction of the IL with a ZE41 magnesium aerospace alloy surface is also demonstrated.     

稀土固体超强酸SO2-4/TiO2/La3+催化合成醋酸丁酯

研究了以固体超强酸SO24-/TiO2/La3+催化剂,醋酸和正丁醇为原料合成醋酸丁酯,并考察了影响反应的因素.结果表明醇酸物质的摩尔比为1.61、催化剂用量0.6 g、带水剂甲苯7 mL、反应时间2.5 h是最适宜的反应条件,其酯化率可达96.2%.     

Solid solution between Al-ettringite and Fe-ettringite (Ca6[Al1 − xFex(OH)6]2(SO4)3·26H2O)

The solid solution between Al- and Fe-ettringite Ca₆[Al_1 − xFe_x(OH)₆]₂(SO₄)₃·26H₂O was investigated. Ettringite phases were synthesized at different Al/(Al + Fe)-ratios (= X_Al,total), so that X_Al increased from 0.0 to 1.0 in 0.1 unit steps. After 8 months of equilibration, the solid phases were analyzed by X-ray diffraction (XRD) and thermogravimetric analysis (TGA), while the aqueous solutions were analyzed by inductively coupled plasma optical emission spectroscopy (ICP-OES) and inductively coupled plasma mass spectrometry (ICP-MS). XRD analyses of the solid phases indicated the existence of a miscibility gap between X_Al,total = 0.3-0.6. Some of the XRD reflections showed two overlapping peaks at these molar ratios. The composition of the aqueous solutions, however, would have been in agreement with both, the existence of a miscibility gap or a continuous solid solution between Al- and Fe-ettringite, based on thermodynamic modeling, simulating the experimental conditions.