胶原-单宁树脂的制备及其对水溶液中UO2+2的吸附特性研究

以天然牛皮为原料,经胃蛋白酶处理制得水解胶原;通过胶原-黑荆树单宁-醛反应制备了胶原-单宁树脂(C-TR)吸附材料,并表征了材料的形貌,测定了材料的比表面积、热变形温度等性质。系统研究了C-TR对水溶液中UO22 的吸附特性。结果表明,C-TR对UO22 有较强的吸附能力。当温度为303K、pH=5.0、UO22 的初始浓度2.5mmol.L-1时,吸附容量达到1.49mmolU/g。升高温度,平衡吸附量增大。pH对吸附容量的影响较大,适宜的pH范围为5.0-6.0。C-TR对UO22 的吸附平衡符合Freundlich方程。吸附动力学可用拟二级速度方程来描述。C-TR对UO22 的吸附基本不受NaCl影响,该吸附材料可望用于海水中铀的富集和分离。     

Acceleration of the cationic polymerization of an epoxy with hexanediol

Thin films of 3,4-epoxycyclohexylmethyl 3',4'-epoxycyclohexane carboxylate were UV irradiated (1.1 J cm^-2) under isothermal conditions ranging from 0 to 50°C. Under these conditions the polymerization advanced quickly but only to a conversion level of less than 10% before the reaction rate slowed by more than an order of magnitude. This drop off in rate was not caused by the glass transition temperature, T _g, reaching or exceeding the reaction temperature, T _rxn, since the epoxide's T _g remained at least 40°C below T _rxn. Raising the sample temperature above 60°C caused a sharp increase in the conversion level. At 100°C conversion exceeds 80% and the ultimate T _g approaches 190°C. The addition of 10 mass% 1,6-hexanediol, HD, to the epoxy caused the conversion at room temperature to quintuple over the level obtained without the alcohol present. The heat liberated from this alcohol epoxy blend during cure on a UV conveyor belt system caused the sample's temperature to increase by about 100°C above ambient whereas the epoxy alone under these conditions only experienced a modest temperature rise of about 26°C. If the amount of HD in the blend is increased above 10% the heat of reaction at 23°C decreases due to HD being trapped in a nonreactive crystalline phase. Boosting reaction temperatures above 50°C melts the HD crystals and yields significantly improved conversion ratios. As the level of alcohol blended with the epoxy is raised its ultimate T _g is lowered and when the concentration of alcohol in the blend nears 30 mass%T _g drops below room temperature. This revised version was published online in July 2006 with corrections to the Cover Date.     

Thermal behaviour of a polyhedral oligomeric silsesquioxane with epoxy resin cured by diamines

A new material belongs to the family of polyhedral oligomeric silsesquioxanes, the 1-(3-glycidyl) propoxy-3,5,7,9,11,13,15-isobutylpentacyclo-[9.5.1.1(3,9).1(5,15).1(7,13)]octasiloxane (glycidylisobutyl-POSS) is characterized by differential scanning calorimetry, thermogravimetric analysis and atomic force microscopy. Epoxy systems based on diglycidyl ether of bisphenol A (DGEBA) cured with the diamines, 4,4'-diamine-diphenylmethane (DDM) and 1,4-phenylenediamine (pPDA), were kinetically studied by differential scanning calorimetry in isothermal and dynamic modes. The thermal behaviour of these systems as the glycidylisobutyl-POSS was added, is discussed later. This revised version was published online in July 2006 with corrections to the Cover Date.     

化学光谱法测定5N氧化钆中14个稀土杂质元素

报道了化学光谱法测定５Ｎ高纯氧化钆中１４个稀土杂质元素，在Ｐ５０７萃淋树脂色层柱上分离氧化钆中稀土杂质元素，分别采用定量分离Ｌａ－Ｓｍ及Ｔｂ－Ｌｕ＋Ｙ和部份分离Ｅｕ的方法，并相应地采用碳粉吸附法和碳粉粉末法进行光谱测定。分离时间为３．５ｈ，测定下限为１．２μｇ／ｇ（ＲＥ）。     

大孔吸附树脂法去除淫羊藿多糖中蛋白的研究

从4种大孔吸附树脂中筛选出ADS-7, 考察了其对淫羊藿多糖中蛋白的去除作用, 并讨论了pH值、 鞣酸、 上样量等对树脂去蛋白效率的影响. 结果表明, 该方法对淫羊藿粗多糖中的蛋白具有较高的去除效率, 淫羊藿粗多糖中的蛋白含量由1.2%下降到0.035%.     

胺固化环氧酚醛树脂对Hg~(2+)的吸附性能

螯合树脂能与金属离子形成稳定的配合物,在无机、冶金、分析药物、催化、海洋化学、放射化学、环境保护各领域都有非常重要的应用[1-3]。我们曾以酚醛树脂为大分子骨架与多胺反应制备了一系列螯合树脂并对其结构及对多种金属离子的吸附性能进行了探讨[4,5]。本文则以线型环氧酚醛树脂为大分子骨架、多乙烯多胺为固化剂,制备了五种不同氮含量的氨基环氧酚醛螯合树脂,并考察其对金属离子Ｈｇ2+的吸附性能。1　实验部分1.1　仪器与试剂ＮｉｃｏｌｅｔＭＡＧＮＡ ＩＲ550(ＳｅｒｉｅｓＩＩ)红外分光光度计,ＳＨＡ-Ｃ水浴恒温振荡器,ＰＥ2000…     

树脂吸附法处理水杨酸甲酯生产废水的研究

采用吸附树脂NDA—99处理水杨酸甲酯生产废水，结果表明该树脂时废水中的5磺基水杨酸及水杨酸均具有良好的吸附—脱附性能．废水经预处理和吸附处理后，CODCr由57000-59000mg／L降至6300mg／L左右，去除率接近89％．用IBV8％NaOH 3BVH2O作脱附剂，在温度为60℃、流量为IBV／h的条件下，脱附率接近100％，树脂可重复使用．高浓度脱附液经酸化、浓缩、冷却结晶，可回收5—磺基水杨酸，回收率为95％左右。纯度为78％。     

螯合树脂浓缩柱预富集低压离子色谱分光光度法测定海水中痕量铅

采用螯合树脂浓缩柱预富集低压离子色谱分光光度法测定海水中痕量的铅。对于2.0μg/L的Pb2 溶液,测定的相对标准偏差为2.9%(n=8);将该法应用于不同盐度海水中铅的测定,获得满意结果,标准加标回收率在94%~101%之间,该法可以识别Ⅰ类海水,可以测定Ⅱ~Ⅳ类海水。     

清除树脂在组合化学中的应用

清除树脂是一种特殊的固相试剂。近五年，它们被广泛的用于平行液相法合成组合化学库，简化液相组合化学库的纯化操作。本文综述了清除树脂在纯化操作中的使用策略。根据清除纯化原理，介绍了共价键型和离子键型两类清除树脂。给出了清除树脂在组合化学中的具体应用实例。最后对清除树脂的发展作了展望。     

一种含氟丙烯酸树脂的制备及其表面疏水性

在聚合反应的后期阶段,向体系中引入含氟丙烯酸酯单体全氟辛基-(N-乙基-N-丙烯酸乙酯基)磺酰胺(QG-F814)共聚改性的方法制备了一种含氟丙烯酸树脂.接触角测定表明,该树脂具有良好的疏水性能.热重分析表明,该树脂在改性前后的耐热稳定性差别不大.