Thermal Stability of a Para-Cresol Novolac Resin

The thermal stability of p-cresol novolac resin was studied by means of DSC, X-ray diffraction, thermogravimetry and SEC investigations. After 30 thermal cycles in which the same sample was heated, cooled and heated again, without attainment of the temperature of degradation at any time in the experiment, important structural modifications are observed. At the end of the experiments, the resin, which is initially highly crystalline, exhibits all the characteristics of a semi-crystalline material. This revised version was published online in July 2006 with corrections to the Cover Date.     

Degradation Kinetics of an Epoxy/Cycloaliphatic Amine Resin Under Isothermal and Non-isothermal Conditions

A study of an epoxy-cycloaliphatic amine system has been realized using a thermogravimetric technique (TG). Isothermal and non-isothermal (dynamic) methods were employed to determine the kinetic data of this system. Five methods were used for determining the activation energies of this system in the dynamic heating experiments. In two of them (Flynn-Wall-Ozawa, and Kissinger) it is not necessary to have a prior knowledge of the reaction mechanism of the degradation behaviour for this system. In the other ones (Coats and Redfern, Horowitz and Metzger, and Van Krevelen et al.) it is necessary to know this reaction mechanism, besides Criado et al. method was used for determining it. The results have shown that good agreement between the activation energies obtained from all methods can be achieved if it is assumed that the degradation behaviour of this system is of sigmoidal-rate type. This revised version was published online in August 2006 with corrections to the Cover Date.     

交联聚苯乙烯强－弱碱树脂的合成及脱色性能研究

交联聚苯乙烯氯甲基化后，分别与甲胺（或二甲胺）、三甲胺（或α－甲基吡啶、二甲基乙醇胺）混合胺化试剂进行亲核取代反应，合成了一系列同时带有强－弱碱功能基的交联聚苯乙烯树脂，并表征了这些树脂的结构，测定了树脂对甜菊甙的脱色性能，结果表明，这些树脂功能基碱性适中，脱色容量较高，甜菊甙损失较少，再生效率高。     

Application of AM SURE™ resin to solid-phase peptide synthesis

A core-shell structure was found in AM SURE™ resin, in which most amino groups were located at the skin layer. The AM SURE™ resin revealed better synthetic efficiency, compared to the noncore-shell type resin in the synthesis of the fragment 65-74 of acyl carrier protein, the fragment 27-35 of HIV (human immunodeficiency virus) fusion inhibitor (T-20) and the Jung-Redemann 10-mer.     

CL-7402萃淋树脂分离富集铅的研究及其应用

通过静态和动态实验,研究了CL-7402萃淋树脂吸附铅的性能和减压微色谱柱分离富集铅的最佳条件。实验表明,此萃淋树脂吸附快,吸附容量大。在减压条件下,以1mol/LHBr为上柱介质,2mol/LHNO3为洗脱液,可使铅与铜、铁等金属离子快速分离。采用三溴偶氮胂光度法测定样品中的铅。     

三唑螯合树脂分离富集催化光度法测定痕量金

研究了三唑螯合树脂 (AMTR)在盐酸介质中分离富集金 ,吸附的容量大 ,选择性高 ,无污染。同时研究了分离后在盐酸介质中 ,在抗坏血酸 (VC)存在下痕量金 催化溴酸钾氧化偶氮氯膦S褪色的指示反应及其动力学条件 ,据此建立测定痕量金 的新方法。方法的检出限为 4.16× 10 - 7g L ,测定范围为 0～ 70mg L ,用于样品的测定获得满意结果。     

钯（0）／离子交换树脂对有机锡试剂和有机卤化物偶联反应的催化性能和结构表征

制备了强碱性阴离子交换树脂（）负载钯（０）催化剂，发现它对有机锡试剂和有机卤化物的偶联反应有很高的催化活性，分离容易，可重复使用．起催化作用的是金属态把．ＸＰＳ等实验结果表明，在催化剂中钯作为桥将功能基－Ｎ（ＣＨ３）３与ＯＨ－联结起来．催化剂中的把可以看作是两配位的和配位不饱和的，经过氧化加成、金属交换、还原消除过程完成催化反应．     

Cure kinetics of a cobalt catalysed dicyanate ester monomer in air and argon atmospheres from DSC data

A kinetic analysis of the cyclotrimerisation reaction of a dicyanate ester monomer catalysed by cobalt(II) acetylacetonate and nonylphenol in air and argon atmospheres has been carried out by differential scanning calorimetry (DSC). Dynamic and isothermal DSC scans as well as the glass transition temperature are the experimental data obtained. From isothermal scans a higher cyanate conversion in air than in argon was obtained. The cyanate conversions are satisfactorily described with a second-order kinetic equation in the kinetically controlled region, and by m-order (m<1) equation after vitrification is reached. Activation energies determined by different procedures agree among them, showing slightly higher values in argon than in air.     

水中非离子型表面活性剂的富集分离和高灵敏光度测定研究

用改性ＰＶＡ树脂，从水中富集痕量合成非离子型表面活性剂（ＳＮＳ），进一步用ＳＮＳ与钡盐和磷钼酸定量地形成难溶缔合物沉淀，使ＳＮＳ与共存物分离浓缩。用Ｍｏ－邻苯二酚紫－溴化十二烷基吡啶（ＤＰＢ）显色反应（表面摩尔吸光系数εｍａｘ值为３．１×１０＾５Ｌ．ｍｏｌ＾－１．ｃｍ＾＿１）体系分光光度测定与ＳＮＳ定量缔合的Ｍｏ，从而间接测定水中痕量ＳＮＳ。方法用于江，湖水中痕量ＳＮＳ的测定，获得较好结果。     

大孔吸附树脂处理含磺胺废水的研究

利用大孔吸附树脂处理含磺胺废水。实验表明，DRHⅢ树脂对磺胺具有良好的吸附－解吸效果。原废水中磺胺浓度约为17.2g/L,COD约为13750mg/L，经树脂吸附处理后，废水中COD去除率约86％，磺胺的吸附率88．2％，树脂的解吸率为97．5％，磺胺的回收率约86．0％，其纯度达99．8％。在废水有效处理的同时实现了废物资源化，具有良好的环境效益和较高的经济效益。