Atom transfer radical polymerization (ATRP): A versatile and forceful tool for functional membranes

The progress in atom transfer radical polymerization (ATRP) provides an effective means for the design and preparation of functional membranes. Polymeric membranes with different macromolecular architectures applied in fuel cells, including block and graft copolymers are conveniently prepared via ATRP. Moreover, ATRP has also been widely used to introduce functionality onto the membrane surface to enhance its use in specific applications, such as antifouling, stimuli-responsive, adsorption function and pervaporation. In this review, the recent design and synthesis of advanced functional membranes via the ATRP technique are discussed in detail and their especial advantages are highlighted by selected examples extract the principles for preparation or modification of membranes using the ATRP methodology.     

Conversion of soybean oil into ion exchange resins: Removal of copper (II), nickel (II), and cobalt (II) ions from dilute aqueous solution using carboxylate‐containing resin

An ion‐exchange resin containing carboxylic acid groups was prepared by reaction of epoxidized soybean oil with triethylene tetramine, followed by hydrolysis of glycerides by using sodium hydroxide solution. The cation exchange capacity of the resins was determined to be 3.50 mequiv/g. The adsorption capacity for Cu²⁺, Ni²⁺, and Co²⁺ on the obtained resin at pH 5.0 was found to be 192, 96, and 78 mg/g, respectively. Effect of pH on the adsorption capacity for copper (II), nickel (II), and cobalt (II) ions were also studied. Cu²⁺, Ni²⁺, and Co²⁺ were adsorbed at a pH above 3. These metal ions adsorbed on the resin are easily eluted by using 1N HCl solution. The selectivity of the resin for Cu²⁺ from mixtures containing Cu²⁺/Co²⁺/Ni²⁺ ions in the presence of sodium chloride was also investigated © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 84: 2386–2396, 2002     

高纯间苯二甲醛合成工艺的改进

通过对间苯二甲醛现有生产工艺的研究,对传统的间二甲苯氯化、氧化水解工艺进行了改进,总收率达到50.2%,比原有工艺提高11%,产品纯度在99.6%以上,并降低了成本。     

血液中毒鼠强的气相色谱-质谱检验

对毒鼠强中毒死亡者血液样品进行了液 -液提取及气相质谱联用仪 ( GC/ MS)分析。考察了苯、乙醚、乙酸乙酯、氯仿、二氯甲烷、己烷、环己烷、丙酮等 8种有机溶剂对毒鼠强的提取效率。结果表明 :乙酸乙酯对毒鼠强的提取率 >90 % ,是一种理想的提取剂。获得的毒鼠强工作曲线为 y=1 2 5 43 .3 * x+5 1 6.2 ,相关系数 r=0 .9983 ,最小检出限为 2 μg/ L;对毒鼠强 GC/ MS图谱进行解析 ,推断出毒鼠强主要 GC/ MS碎片的归属 ,采用选择离子监测模式 ( SIM)对毒鼠强中毒死亡者血液样品进行了检测 ,提高了检测限并减少了干扰 ,建立了一个适合司法检验的毒鼠强提取分析方法     

腰果酚醛胺固化环氧树脂泡沫塑料性能研究

以双酚A型环氧树脂(EP)为基体树脂、自制的腰果酚醛胺(PCT)为固化剂、正戊烷(N-PT)为发泡剂、吐温-80和二甲基硅油为稳泡剂室温发泡制备新型环氧树脂泡沫塑料。研究了PCT用量对发泡时间和泡沫性能的影响,通过扫描电子显微镜和热失重分析对泡沫塑料的微观形貌和热性能进行了表征。结果表明,随着PCT用量增加,发泡时间逐渐缩短;环氧树脂泡沫塑料的密度、压缩强度、吸水率和热导率均随PCT用量的增加呈现先减小后增大趋势;当PCT加入量为30 %(相对于纯EP)时,发泡时间降至5 min;泡沫塑料的综合性能较佳,密度为0.0467 g/cm^3、压缩强度为276 kPa、吸水率为2.9 %、热导率为0.037 W/m·K,此时泡孔大小均匀,不良泡孔少;泡沫初始失重温度为248.4 ℃,最大失重速率温度为362.3 ℃,耐热性最佳。     

三乙烯四胺、三聚氰胺对Au催化NaBH4直接氧化的改善

用循环伏安、交流阻抗测试,研究了添加剂三乙烯四胺、三聚氰胺对金(Au)催化硼氢化钠( NaBH-4)直接氧化的影响.三乙烯四胺和三聚氰胺的吸附作用可减少电极表面的BH4-,使每个BH4-有更多的H原子能接触到催化点发生氧化.三乙烯四胺和三聚氰胺改善NaBH4在Au催化下直接氧化的最佳浓度分别为160 μmol/L、1....     

水性环氧固化剂的制备研究

文章采用环氧树脂E-44和聚乙二醇400为原料合成改性环氧树脂,然后与三乙烯四胺反应制备水性环氧固化剂.研究表明：改性环氧树脂与三乙烯四胺质量比为2∶1,反应温度为60℃,反应时间为2h,制备的水性环氧固化剂性能优良.     

塑料助剂产业前景看好（四）

2006年光稳定剂的消耗量为4000t,其中受阻胺光稳定剂的用量占60%。光稳定剂的发展趋势是高效、高分子量化、多功能化和无毒化。2006年我国AC发泡剂的生产能力已达15万t/a,实际生产量超过11万t,存在的问题是品种单一、生产规模小和生产工艺落后。2006年我国润滑剂的生产能力为10.4万t/a,产量7.2万t,实际消费量8.0万t,目前国内尚缺少某些高质量专用牌号。     

气相色谱法测定鼠药中的毒鼠强

建立了利用气相色谱毛细管柱程序升温、火焰光度检测器(FPD-S)分析测定毒鼠强的新方法。通过对气化室温度、检测器温度、柱温、吹扫气流量等色谱条件的优化,提高了方法的检测限,毒鼠强的检测限为0.1μg/mL,加标回收率为98.3%。用外标法定量时,指数方程的线性关系良好。该方法用于实际鼠药样品的测定,快速、准确,灵敏度高。     

毒鼠强中毒检验的研究

应用气相色谱仪对毒鼠强进行检测 OV 1 0 1 ( 1 5m× 0 .53mm)大口径石英毛细管柱分离 ,FID最小检出限为 2ng ,线性范围 50～ 1 0 0 0 μg ,相关系数 0 999;NPD最小检出限 0 0 2ng ,线性范围 0 0 2～ 50 μg ,相关系数为 0 999 较为系统地研究了各类检材的处理方法 ,色谱柱的选择 ,并对提取溶剂和净化剂进行了筛选比较 ,利用大口径毛细管柱的高分辨率和氮磷检测器的高灵敏度 ,提高了毒鼠强最低检出限