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1.
以花生壳为原料,用硫代乙醇酸和乙酸酐改性花生壳做固体吸附剂,并探讨了改性前后的花生壳在不同吸附条件下,定量吸附水样中的Cu(Ⅱ),Pb(Ⅱ)的能力,采用原子吸收光度法分别测定其含量的方法。实验得出,对于50mL 5.001μg/mL Cu(Ⅱ)溶液,1.5g巯基花生壳在常温下做2.5h静态吸附的吸附效率最好,可达到92.82%。而对于50ml 43.35μg/mL溶液,2g未改性花生壳(常温)和1g未改性花生壳(加热至40℃)做2.5h静态吸附时吸附效率最好,其吸附效率可以分别达到91.43%和91.26%。 相似文献
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李占才 《郑州轻工业学院学报(自然科学版)》1998,13(2):48-51
由三聚氯氰出发,经胺化、巯基化和甲基化,合成了除草剂扑草净.总收率达80.40%.实验主要对巯基化一步进行了改进.产品用熔点测定、红外和气相色谱法进行了分析,含量达95.60%. 相似文献
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以废弃木薯秸秆为原料,经碱化、添加巯基官能团进行改性得到吸附剂,对其进行了表征,并研究了不同条件下吸附剂的对Cu(Ⅱ)和Zn(Ⅱ)吸附性能。结果表明,木薯秸秆成功引入巯基基团。经过巯基改性后的木薯秸秆的吸附量得到提升,吸附量随p H的升高而增大,在30 min内吸附量可迅速达到平衡,吸附动力学符合准2级动力学方程。对Cu(Ⅱ)的等温吸附符合Langmiur等温模型,近似于单层吸附,理论最高吸附量为65.36 mg/g;对Zn(Ⅱ)的等温吸附符合Freundlich等温模型,以多分子层吸附为主,理论最高吸附量为60.24 mg/g。两者吸附过程均为自发的放热过程。 相似文献
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Nikolay A. Pchelintsev Alexander Vakurov Henry H. Hays Paul A. Millner 《Electrochimica acta》2011,(6):2696
Electrochemical oxidation of thiols in acetonitrile and application of this process for modification of glassy carbon electrodes were studied. Addition of strong deprotonating agent, tetrabutylammonium hydroxide, was found to facilitate oxidation of thiols as well as their deposition onto the carbon surface. Thus, in the presence of 1 mM tetrabutylammonium hydroxide, glassy carbon electrode can be grafted with 1 mM 3-(nitrobenzyl)mercaptan at as low as +200 mV (vs. SCE). The modified electrodes were characterized by electrochemical methods and XPS confirming the stable binding of thiols which were absent on the surface of unmodified and control treated electrodes. Surprisingly, surface modification occurs independent of RS radicals formation and is explained by nucleophilic addition of deprotonated thiols to the surface of carbon electrode. The electrode potential plays an important role in this process presumably modulating electrophilic properties of the carbon surface. 相似文献
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以 3-三氟甲基 - 4-氨基 - 5 -巯基 - 1 ,2 ,4-三唑为原料 ,分别与 2 - ,3- ,4-吡啶甲酸及α-萘乙酸在 POCl3催化下反应 ,制得 4种新的 3-三氟甲基 - 6-取代均三唑并 [3,4- b]- 1 ,3,4-噻二唑( 3a~ 3d) ,并利用 EA,IR,1H NMR等确定了其结构 相似文献
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研究了 3(3’-氯苯基 ) - 4 -氨基 - 5-巯基 - 1 ,2 ,4-三唑 ( a)和 3(3’-吡啶基 ) - 4 -氨基 - 5-巯基 - 1 ,2 ,4-三唑 (Ib)在 POCl3存在下 ,分别和己二酸反应 ,制得了两种含双稠杂环的化合物 ;1 ,4-二 [6- (3-氯苯基 )均三唑并 [3,4- b]- 1 ,3,4-噻二唑 - 3-基 ]正丁烷( a)和 1 ,4- (6- 3-吡啶基 )均三唑并 [3,4- b]- 1 ,3,4-噻二唑 - 3-基正丁烷 ( b) ,并利用EA,IR,1H NMR等确认了其结构。 相似文献
9.
Sung-Min Kwon Bong Ki Min Jun Sik Son Kyo-Han Kim 《Journal of Adhesion Science and Technology》2016,30(5):506-519
The purpose of this study was to investigate the efficacy of novel mercapto silane-based experimental primers on the resin bonding and its durability to dental noble metal–ceramic alloys in comparison with that of commercial primers. Disc-shaped gold–platinum–palladium, gold–palladium–silver, and palladium–silver alloy specimens were used as the adherents after air-abrasion. One of three commercial primers (M.L. Primer, Single Bond Universal, and All-Bond Universal) and two experimental primer systems (2-step application with γ-mercaptopropyltrimethoxysilane and then γ-methacryloxypropyltrimethoxysilane and a blend of the two silanes) was applied to each alloy. Resin cylinders with a diameter of 2.38 mm were bonded to the surfaces and light-cured. All bonded specimens were stored in water at 37 °C for 24 h and then half of them additionally water immersed for 7 days (37 °C) and then thermocycled 10,000 times before the shear bond strength test (n = 10). The surface energy parameters for unprimed and primed alloy surfaces were calculated based on the contact angle measurements. The bond strength data were non-parametrically analyzed at α = 0.05. Regardless of the alloy type, both mercapto silane systems equally and consistently showed superior bonding durability to the commercial primers. Pearson correlation analyses revealed moderate to strong, significant correlations between the surface energy parameters and the bond strength values. The two novel mercapto silane systems are a promising alternative for enhanced durability of resin bonding to dental noble metal–ceramic alloys. 相似文献
10.
以双酚A环氧树脂(E51)为基料、聚醚胺(D?230)为固化剂、含巯基聚硅氧烷(PMMS)为改性剂,分别经过简单物理混合和化学改性的方法,制备了一系列聚硅氧烷改性环氧树脂(E51⁃D⁃PMMS)固化物。通过衰减全反射红外(ATR?FTIR)和X射线衍射仪(XRD)表征了固化物的结构特征;通过拉伸测试和冲击实验、扫描电子显微镜(SEM)、接触角测量(CA)、动态热力学分析(DMA)及中性盐雾实验探究了改性固化物的力学性能、热稳定性、防腐性能等。结果表明,化学改性的E51?D?PMMS固化物的综合物理化学性能优于简单物理改性的,当PMMS含量为1 %(质量分数,下同)时,改性固化物的拉伸强度为74.63 MPa,较改性前提高了13.5 %,断裂伸长率提高了40.2 %,冲击强度提高了43.7 %;水接触角从改性前的72.8 °增至100.3 °,表面能从39.4 J/m2降至17.4 J/m2,吸水率下降了44 %,耐水性能大大增强;其防腐性能和玻璃化转变温度(Tg)也有一定的提升。 相似文献