双季铵盐类缓蚀剂的研究进展

简述了双季铵盐类缓蚀剂在金属腐蚀领域的研究进展。指出双季铵盐是一类新型的阳离子Gemini表面活性剂,由于具有低毒、较好的表面活性和良好的水溶性等特点,作为缓蚀剂具有广阔的应用前景。根据分子结构的不同,可以把双季铵盐分为对称型烷基双季铵盐、对称型杂环双季铵盐和不对称型双季铵盐,详细介绍了三类双季铵盐的缓蚀性能测试结果。指出双季铵盐类缓蚀剂的研究还缺乏系统性,合成环保易降解的双季铵盐、缓蚀机理研究和工业应用将成为今后双季铵盐类缓蚀剂的研究重点。     

双季铵盐类化合物的研究现状及合成进展

双季铵盐类化合物是一类具有较强杀菌活性的杀菌剂,属于Gemini表面活性剂中的一种.目前国内外对双季铵盐类化合物的结构、性质及合成已经取得很大的进展.本文简略介绍了此类化合物的结构和杀菌性能,详细阐述了其目前的研究状况和合成方法.     

双季铵盐杀菌剂的合成

以十二胺、甲酸和甲醛为原料制备出中间体长链叔胺，又以长链叔胺和1，3-二溴丙烷合成出双季铵盐杀菌剂，研究了长链叔胺和双季铵盐的合成工艺条件，应用红外光谱对其结构进行表征，双季铵盐收率可达85．4％。     

新型双季铵盐杀菌剂的合成及其杀菌性能研究

以乙二胺、甲酸、甲醇和氯乙酸乙酯为原料,合成了双季铵盐杀菌剂,以绿藻为模型,探讨了双季铵盐的浓度和投加时间对其杀菌性能的影响。结果表明,当双季铵盐的浓度为0.3 g/mL时,杀菌效果较好,3 d可实现79.25%的杀菌率,且投加时间越长,灭菌效果越显著。     

双季铵盐杀菌剂的杀菌试验研究

为解决循环冷却水的微生物问题,克服目前较多使用的一些杀菌剂的若干不足之处。本文在多种杀菌剂研究的基础上,进行了双季铵盐杀菌剂静态实验研究。发现双季铵盐具有高效低毒、作用时效长的特点,是一种优良的杀菌剂。     

羟丙基双三甲基氯化铵加压制备工艺研究

以三甲胺、1,3-二氯丙醇为原料合成了双季铵盐β-羟基丙基-α,γ-双(三甲基氯化铵)。结合其反应原理,考察了反应温度、反应物配比、反应物浓度、反应压力对双季铵盐收率的影响;在最佳反应条件下,双季铵盐收率≥99%。运用红外光谱对提纯后的合成产物进行了结构表征,测定了固体产物的熔点。     

2-环氧基丙基三烷基季铵盐的合成

以高级叔胺和环氧氯丙烷为原料合成了几种阳离子季铵盐，该类季铵盐可以作为一些反应的催化剂，也可以作为一些化合物的中间体。对该类季铵盐的合成条件做了优化，得到反应的最佳条件，并应用红外光谱和元素分析对合成的化合物结构作了表证。     

一种脂肪族双季铵盐的合成方法研究

以三乙胺、二溴代烷烃为原料,来制备出双季铵盐,并对其结构进行了红外光谱和核磁共振表征。研究了采用合成双季铵盐的工艺条件,得到了最佳的反应条件,发现了一条合理的制备方法。     

季铵盐对酸性介质中钢铁的缓蚀作用

本文介绍了以三甲基胺、溴代烷、吡啶等为原料，合成了一系列季铵盐化合物，用失重法研究了它们在５％硫酸介质中，在不同温度下，对碳钢的缓蚀作用，阐述了季铵盐的分子结构及试验温度对缓蚀率的影响。     

双季铵盐杀菌剂的合成及其杀菌性能研究

利用自制的双卤代醚与长链叔胺,合成了双季铵盐杀菌剂,并对其结构进行了红外表征,评价了其杀菌效果,并与12 2 7进行了杀菌性能的对比。实验结果表明:双季铵盐对SRB具有良好的杀菌性能,而且杀菌能力也明显优于12 2 7,在菌量较高的情况下(1.5×10 8个·mL-1)杀菌浓度仅为5 0mg·L-1,就能10 0 %杀死SRB ,是一种很有应用前景的新型杀菌剂。     

金属间化合物/陶瓷基复合材料的制备工艺与研究进展

金属间化合物材料具有许多优良的性能,可以将金属间化合物与陶瓷材料相复合形成金属间化合物/陶瓷基复合材料.金属间化合物/陶瓷基复合材料是近年来发展起来的一种新型复合材料,制备的金属间化合物/陶瓷基复合材料具有很多优异的性能.本文主要介绍金属间化合物/陶瓷基复合材料的制备工艺和力学性能以及研究进展,研究和开发的金属间化合物/陶瓷基复合材料主要包括Fe-Al金属间化合物/陶瓷复合材料,Ti-Al金属间化合物/陶瓷复合材料和Ni-Al金属间化合物/陶瓷复合材料.本文对金属间化合物/陶瓷基复合材料未来的发展趋势进行了分析和预测.     

二硝甲基唑类含能化合物的研究进展

二硝甲基唑类化合物是一类结构新颖的多氮含能化合物。综述了二硝甲基唑类化合物的合成方法和反应性质,并对部分含能化合物的性质进行了介绍。结果表明,二硝甲基唑类化合物的密度较大,且具有较高的正生成焓,但自身热稳定性较差,以其为阴离子合成出的离子盐具有较好的热稳定性。目前,二硝甲基唑类化合物的合成方法较成熟,但理论方面的研究不够深入。     

Viscoelastic characterization of rubber compounds

The viscoelastic properties of gum rubbers and the properties of corresponding compounds are discussed. Representative examples are given to illustrate the important influence of gum rubber on the compound properties. A method for evaluating strain amplification and strain-rate amplification is proposed. Examples are given to show the characterization of compounds with respect to the variation in gum rubbers and carbon black grades. The unique characteristics of compounds which are not observed in gum rubbers are also discussed.     

新型酰腙化合物的合成及其表征

酰腙化合物具有较强的配位能力、多样的配位方式、良好的生物化学和药物活性及非线性光学性质。因此在医药、农药、材料和分析试剂等方面备受关注。本实验在微波反应法合成乙酰肼,进一步分别与环戊酮、乙酰丙酮、糠醛等含羰基的化合物反应,得到未经报道的酰腙化合物以及乙酰丙酮乙酰酰腙的铜配合物。     

磺胺类化合物生物活性研究进展

磺胺类化合物因其广泛的生物活性在医药、农药领域备受关注。对磺胺类化合物杀菌、抗病毒活性的研究进行了分类综述,并展望了它的发展趋势和应用前景。     

Effect of plasticizer functionality on the performance properties of flexible PVC compounds

This paper is on the enhancement of physical properties achieved through utilization of linear plasticizers in flexible PVC compounds. This paper also emphasizes the use of statistical methods and designs of experiments. In a series of experimental designs, electrical, oven-aging, and low temperature performance of commercially available phthalate plasticizers were evaluated. Test data will be given to show the effect of plasticizer functionality on the performance properties of flexible PVC compounds.     

ESTIMATION OF TRANSPORT PROPERTIES OF LIQUIDS

Based on the theory of intermolecular forces and the Hildebrand relation, a generalized equation in terms of refractive index is proposed to estimate viscosity, thermal conductivity and diffusion coefficients of liquid non-polar compounds at various temperatures. Analytical equations are provided to estimate transport properties of n-alkanes in terms of molecular weight. Average deviations for all three properties of various hydrocarbons from C⁵ to C²⁰ are within 1 % for a large number of data points. The proposed equation also predicts transport properties of some polar compounds with a reasonable degree of accuracy.     

Studies on quinoline type dyes and their characterisation studies on acrylic fabric

Nitrogen heterocyclic fluorescent compounds and their possible dyeing pathway on acrylic fabrics was investigated. Their chemical spectral properties, including fluorescence and ultraviolet–visibility, were evaluated in this work. The colour fastness properties of these dyes attributable to light reflection and washing were examined. The CIE L*, a* and b* values after the dyeing process were studied and the colour fastness properties were also determined. Two quinoline derivatives showed stronger fluorescence properties and were also demonstrated to be non‐cytotoxic towards human HaCaT skin keratinocytes at a reasonable dose. These results led to speculation that these two compounds could be further used as dyes in various textile applications.     

High Performance Bismaleimide Resins Modified by Novel Allyl Compounds Based on Epoxy Resins

A novel class of allyl compounds based on epoxy resins was synthesized and characterized. The synthesis of these allyl compounds was carried out by reacting corresponding epoxy resin with 2-allyl-4-methylphenol. The copolymers of 4,4′-bismaleimi-dodiphenyl methane with the allyl compounds were prepared and their properties were measured. Results show that modified bis-maleimide resins have excellent processing characteristics such as low softening point, good solubility in acetone, outstanding tack and drape properties, high thermal and hygrothermal stability, as well as improved toughness. Composites based on these copolymers and woven glass cloth also have good properties.     

Theoretical Prediction of Physicochemical Properties,Performances and Sensitivities of some New Derivatives of Dinitro Triazolyl Triazine

In this paper, important properties of some new derivatives of dinitro triazolyl triazine as novel heterocyclic energetic compounds are evaluated and discussed by using some reliable models. The predicted properties are also compared with octahydro‐1,3,5,7‐tetranitro‐1,3,5,7‐tetrazocine (HMX) as a benchmark compound and 2,4,6‐trinitro‐1,3,5‐triazine (TNTA) as a theoretically new high performance energetic compound. It is shown that some of these compounds can be seen as interesting high‐nitrogen organic explosives with relatively low sensitivity which could be introduced for some important industrial applications. Since some of the new compounds have good oxygen balance, calculated specific impulses confirm that these compounds can be considered as suitable oxidizers in solid propellants.