反相高效液相色谱法测定鼻炎滴剂中绿原酸的含量

建立测定鼻炎滴剂中绿原酸含量的方法。利用RP-HPLC法,采用DiamonsilTM(钻石)C18色谱柱(250mm×4.6mm,5μm),以甲醇-水-冰醋酸(25:75:1)为流动相,流速1.0mL/min,检测波长328nm,用RP-HPLC法测定金银花的活性成分绿原酸,在4.34～30.38μg/mL范围内与峰面积呈良好线性关系,回归方程为:A=263232c 120130,相关系数r=0.9995。绿原酸的平均回收率100.5%(RSD=0.86%,n=3)。方法简便、快速,被测组分与其他组分色谱峰分离良好。     

透明聚烯烃用成核剂合成的研究

介绍了聚烯烃成核剂合成反应所用助剂选择,反应条件的确立,利用均匀设计实现最佳配比实验,对不同侧基苯甲醛缩合反应进行了研究。     

双黄隆反相高效液相色谱分析

本文报道用反相高效液相色谱分析双黄隆可湿性粉剂，其有效成分甲黄隆、绿黄隆含量的方法，以甲醇和１％乙酸钠水溶液作流动相，以香豆素为内标物，在２５４纳米下检测。甲黄隆、绿黄隆变异系数分别为０．３４％、０．６１％。     

磺基琥珀酸单酯钠盐系列产品的制备及应用性能

研究提供了制备磺基琥珀酸单酯钠盐的工艺条件，对反应时间对酯化反应的影响、反应物配比和反应时间对磺化反应的影响分别进行了探讨。通过控制条件研究了此反应的机理，并通过实验探讨了其增稠和低刺激的性能。     

提高硫酸生产用钒催化剂性能的技术措施与效果

针对国产的硫酸生产用钒催化剂普遍存在的反应活性欠稳定、颗粒强度偏低、催化剂床层阻力偏大等问题，采取了对载体硅藻土进行共再浆水选处理、煅烧处理、热浓硫酸处理;晨添加剂中加入稀有元素，提高钾钒比，优化中和条件；采用专利技术成型，成品采用立式煅烧等技术措施，提高了钒催化剂的性能。改进后的钒催化剂不易粉化，低温型钒催化剂的活性明显提高，起燃温度可降至350℃，390℃以下的活性明显优于宽温型的，宽温型钒催化剂在390－450℃的活性更为优异。     

改性磷石膏球作缓凝剂对水泥性能的影响

研究了工业化生产的改性磷石膏球对水泥标准稠度用水量、凝结时间、胶砂流动度、胶砂强度及水泥与减水剂相容性的影响,并与原状磷石膏和天然石膏进行对比,结合X-射线衍射、综合热分析等微观测试,分析了改性磷石膏球对水泥水化产物相、水化程度的影响.结果表明:采用改性磷石膏球配制的水泥,其初凝、终凝时间与掺配原状磷石膏水泥相比分别缩短217 min、227 min,1d、3d强度显著高于原状磷石膏配制的水泥,28d强度高于天然石膏配制的水泥,且标准稠度用水量、胶砂流动度、与减水剂的相容性等指标优于天然石膏配制的水泥.改性磷石膏球对水泥早期水化无不良延缓作用,且能提高水泥后期水化程度.综合对比上述三种石膏对水泥性能影响的各项指标,认为改性磷石膏球可以完全替代天然石膏作水泥缓凝剂.     

Normalized age applied to AAR occurring in concretes with or without mineral admixtures

This paper presents a method for assessing the normalized age factors, which allow accelerated alkali-aggregate reaction (AAR) tests performed at various temperatures (20, 40 and 60 °C) to be related to the conditions encountered in situ in concrete structures. The evaluation of normalized age factors is based on the comparison of many experimental results taken from the literature concerning laboratory tests and in situ measurements. The use of these factors permits us to evaluate, from the results of an accelerated test performed at 60 °C, the protection time against AAR that could be expected for in situ concretes containing mineral admixtures (silica fume and fly ashes). The results show that, in addition to the inhibitory action of mineral admixtures leading to a strong decrease in the final AAR-swelling, the protection against abnormal expansion caused by AAR increases significantly when mineral admixtures are used. Abnormal expansion is expected at 2-4 years for plain concrete compared to 7-50 years for concrete with mineral admixtures.     

用于燃油节能环保的有机稀土活性复合物的制备及应用

由有机稀土配体化合物、表面活性剂、助表面活性剂、稳定剂、溶剂等原料制备出有机稀土活性复合物。通过柴油机台架实验发现,该种复合物的加入不仅对柴油机节能、抗磨损及保护发动机起到积极的作用,同时能有效降低尾气中有害物质的排放。     

耐热性橡胶配合技巧(上)

介绍了耐热橡胶的等级划分，各种橡胶的使用温度和性能特点，及13种橡胶（天然橡胶、聚氨酯橡胶、丁苯橡胶、顺丁橡胶、氯丁橡胶、丁腈橡胶、氯磺化聚乙烯橡胶、氯醚橡胶、丁基橡胶、乙丙橡胶、丙烯酸酯橡胶、氟橡胶、硅橡胶）的78个耐热配方实例，并对配方做了简要说明。所述配方可基本满足橡胶材料从A～I级9个耐热等级的不同要求。     

Synthesis and properties of new polymerized monomer reactants matrix resins of pyrrolone–benzimidazole copolymers containing pyridine unit

A series of new polymerized monomer reactants (PMR) matrix resins of poly(pyrrolone‐benzimidazole)s containing a pyridine unit (PPBP) were synthesized by polycondensation of monoethyl ester of cis‐5‐norbornene‐endo‐2,3‐dicarboxylic acid, 2,6‐diphenyl ester pyridinedicarboxylic acid or 3,5‐diphenyl ester pyridinedicarboxylic acid, and diethyl ester of 4,4′‐oxydiphthalic acid with 3,3′‐diaminobenzidine in a mixing solution of anhydrous ethyl alcohol and N‐methylpyrrolidone under given temperature and pressure conditions. The resulting resin solutions showed good solubility in polar organic solvents and stability at room temperature. The corresponding PPBP matrix resin, molded powder, and molded plate were prepared by undergoing amidation, imidization, cyclization, and crosslinking reactions when the reaction temperature was increased from 80 to 350°C, successively; the crosslinking structure was formed by the reverse Diels–Alder reaction at 270–290°C under 50 MPa pressure (2.5–3.5 MPa displayed by the pressure meter). The chemical reactions and properties of the resulting PPBP were studied by means of FTIR, TGA, and DMA methods, and the results indicated that the kinds of PPBP materials retain excellent thermal stability and processability; when the initial decomposition temperature was above 620°C the T_g was at 413.5°C for 3,5‐PPBP‐20 molded plate. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 91: 3981–3990, 2004