Correlation of structure and properties of melt spun PbSn30Sb7Cu quaternary alloys

Using x‐ray diffractometry, double bridge method and dynamic resonance technique structure, electrical resistivity, elastic modulus, internal friction and thermal diffusivity of Pb_63‐xSn₃₀Sb₇Cu_x [x=0 or x≤2.5] quaternary melt spun alloys have been investigated. Adding Cu to PbSn₃₀Sb₇ decreases electrical resistivity, elastic modulus and internal friction. The PbSn₃₀Sb₇Cu₁ melt spun alloy has better properties as bearing alloy, such as low electrical resistivity, high elastic modulus and adequate internal friction, compared with the Pb₈₈Sn₁₀Cu₂ alloy used for automotive applications (FIAT Normalizzazione). That means, it has good properties as lead free (non‐toxic) bearing alloy. (© 2005 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)     

四苯基硼季铵盐的合成和光引发性能

自由基聚合;四苯基硼季铵盐的合成和光引发性能     

四元体系Na+,K+∥CO32-,B4O72--H2O 298K相平衡研究

采用等温溶解平衡法研究了四元体系Na^ ,D^ //CO3^2-,B4O7^2--H2O 298K时的相关系,该四元体系298K时的溶解度等温图含有5个相区：Na2B4O7.10H2O,K2B4O7.4H2O,Na2CO3.10H2O,K2CO3.3/2H2O和复盐Na2CO3.K2CO3.H2O,7条单变量曲线和3个共饱点,其中NaCO3.K2CO3.H2O K2CO3.3/2H2O K2B4O7.4H2O为相称共饱点,体系中发现了一种新的复盐：Na2CO3.K2CO3.H2O,这种复盐同时存在于含Na^ ,K^ //CO3^2-H2O三元体系的其它四元或高元体系中。     

含叔胺氢卤酸盐水溶性感光酚醛树脂的研究

环氧酚醛树脂;水溶性高聚物;季铵盐;感光高分子;含叔胺氢卤酸盐水溶性感光酚醛树脂的研究     

Solvothermal Syntheses of (H2en)2Sn2S6· en and[(H2hmda)3(Hhmda)2](Sn2S6)2Using SnCl4 and S8 as Starting Materials

Three thiostannates (H2en)2Sn2S6·en 1, (Hen)4Sn2S6 2 (en = ethylenediamine, a known compound)and [(H2hmda)3(Hhmda)2](Sn2S6)2 3 (hmda = hexamethylenediamine) were solvothermal conditions. Compound 1 crystallizes in the triclinic system, space group P(1) with a =8.7491(17), b = 10.704(2), c = 12.2031(19) (A), α = 74.888(13), β= 72.998(12), γ= 89.032(15)°, V= 1052.9(3) (A)3, Mr = 614.08, Z = 2, Dc = 1.937 g/cm3,μ = 2.966 mm-1, F(000) = 604, S = 1.211, R = 0.0579 and wR = 0.0770 for 3999 observed reflections with I ＞ 2σ(I); while 3 crystallizes in the triclinic system, space group P(1) with a = 9.8075(13), b = 10.8266(16), c = 14.303(2) A, α =88.611(10), β = 81.030(9), γ= 74.609(9)°, V = 1446.1(4) (A)3, Mr = 1448.78, Z = 1, Dc = 1.664g/cm3, μ = 2.173 mm-1, F(000) = 730, S = 1.173, R = 0.0457 and wR = 0.0667 for 5738 observed reflections with I ＞ 2σ(I). The compounds are composed of dimeric [Sn2S6]4- anions and protonated alkylenediamine cations.     

单吡啶季铵盐表面活性剂的合成及杀菌性能

近年来,季铵盐类阳离子表面活性剂的品种开发和产品应用得到了较快发展。吡啶季铵盐型表面活性剂可作为沥青乳化剂、织物柔软剂、抗静电剂和杀菌剂。本文以吡啶为母体,通过吡啶的烷基化,季铵化合成了一系列的单吡啶季铵盐,并对其表面活性进行了表征。同时通过与四种细菌作用,从杀菌率、最小抑菌浓度(minimal inhibitory concentration)最小杀菌浓度(minimal bactericial concentration)得出了此类阳离子表面活性剂具有一定的表面活性和杀菌性能,可作为一种良好的复配剂。合成路线如下。     

硅胶接枝新型长链季铵盐抗菌材料制备及其抗菌性能

硅胶接枝季铵盐;水不溶抗菌材料;聚乙烯亚胺;抗菌机理     

季膦-磷钨酸室温离子液体的合成及光催化降解罗丹明B

以不同摩尔比的磷钨酸与烷基取代季膦盐为原料合成了一系列磷钨酸类离子液体,并使用DSC和IR对系列离子液体进行了表征。 结果表明,[P(C14H29)(C6H13)3]-磷钨酸系列离子液体为室温离子液体,磷钨酸根保留了Keggin结构。 进一步研究了在可见光照射下,以所制备的磷钨酸季膦盐离子液体为催化剂催化降解罗丹明B染液。 以脱色率和COD来表征染料的降解效果,分别探讨了离子液体中阳离子碳链长度、催化剂用量、光照时间和罗丹明B的初始浓度等因素对光降解罗丹明B的影响。 结果表明,其中[P(C14H29)(C6H13)3]3-PW12O40离子液体的催化效果最好,在催化剂用量为0.3 g时,3 h内50 mL 8.35×10-5 mol/L罗丹明B的降解率可达到95%以上,催化剂重复使用5次后,脱色率仍可达到97%以上。     

新型季铵盐氟碳表面活性剂的合成及其表面活性

以六氟环氧丙烷多聚体为原料,与N-甲基哌嗪经酰胺化反应制得含氟化合物(3);3与碘代烷经季铵化反应合成了4个新型的季铵盐型氟碳表面活性剂(5a~5d),其结构经1H NMR,19F NMR,IR和HR-ESI-MS表征。表面性能测试结果表明,5a~5d具有较高的表面活性,水溶液的临界胶束浓度(CMC)分别为1.38×10-4g·mL-1,1×10-4g·mL-1,1.40×10-4g·mL-1和3.72×10-4g·mL-1,对应CMC的表面张力分别为19.47mN·m-1,17.20 mN·m-1,17.98 mN·m-1和19.79 mN·m-1。     

光谱法研究3H-吲哚季铵盐探针分子与牛血清底的相互作用

合成了一种新型的荧光探针分子2-(对-十二烷基氨基)苯基-3, 3-二甲基-5-乙酯基-3H-吲哚基-甲基-二-十六烷基碘化铵, 并运用荧光光谱探讨它与牛血清蛋白的作用. 结果表明, 探针分子与牛血清蛋白(BSA)的结合作用可使3H-吲哚的荧光强度增强, 而对蛋白质却具有猝灭性质, 其结合常数和结合位点数分别为Ka=1.995×105 dm3*mol-1和n=1.12.