新显色剂二溴对甲基偶氮甲磺光度测定稀土的研究和应用

研究了新显色剂二溴对甲基偶氮甲磺光度测定铈组稀土总量的方法，在酸性介质中，试剂与以铈组稀土为代表稀土形成蓝色配合物，在６４４ｎｍ有最大吸收，铈含量在０～１５μｇ／２５ｍｌ范围内符合比耳定律，方法应用于钢铁中铈组稀土总量的直接测定，发现其准确性和重视性良好。     

Polymerization of styrene started by free radicals,generated by external force action-chemical potential gradient of the swelling agent — on the PVC/solvent optical phase boundary

Summary There were studied the process of styrene polymerization in PVC swollen surface layer initiated by free radicals generated under the action of chemical potential gradient as an external force. It was found that conversion of styrene into the block copolymer is an diffusion controlled process.

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Zusammenfassung Die Initiation des Prozesses der Polymerization von Styrol in den Oberflächenquellungsschichten von PVC wurde untersucht.Dabei wurde festgestellt, daß die freien Radikale, welche bei Zerreißung von spannungsbeanspruchten Bindungen, wie sie durch Einfluß von äußeren Kräften auf den Gradienten des chemischen Potentials des Quellungsmittels an Oberflächenquell bildungsmittel Polymer entstehen können, Polymerizationsprozesse des olefinischen Quellungsmittels initiieren können.

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Dedicated to ProfessorV. Kellö in celebration of his 60th birthday.     

羧甲基纤维素系列高分子表面活性剂超声合成的研究

研究了在超声波作用下羧甲基纤维素的降解反应及ＣＭＣ与具有不同亲水亲油比值的活性大单体「烷基醇（酚）聚氧乙烯醚丙烯酸酯及第三单体」的超声共聚反应。经萃取提纯的共聚产物用ＩＲ，＾１３Ｃ ＮＭＲ和ＵＶ等方法进行表证，证实通过超声反应制得了二元和三元共聚物。     

新显色剂对溴苯酚偶氮若丹宁光度法测定Au（Ⅲ）的研究

提出了以显色剂对溴苯酚偶氮若丹宁[5-(5-溴-2-羟基苯偶氮)若丹宁]作为光度法测定Au(Ⅲ)试剂的新方法。在1.2mol·L~(-1)盐酸介质及阴离子表面活性剂十二烷基苯磺酸钠(SDBS)存在下,Au(Ⅲ)与试剂形成桔红色配合物,545nm处有最大吸收,摩尔吸光系数ε为7.75×10~4,Au(Ⅲ)浓度在0～44μg/25ml范围内服从比耳定律。方法灵敏度高,选择性好,配合物的稳定时间长,操作简便,已成功地应用于含金废水中Au(Ⅲ)的测定。     

STUDIES ON THE MECHANISM OF VINYL PHOTOPOLYMERIZATION INITIATED BY CONDENSED AROMATIC HYDROCARBON-ANILINE SYSTEMS

Initiation mechanism of the photopolymerization of acrylonitrile and methyl methacrylate, usingbinary condensed aromatic hydrocarbon (CAH)-aniline systems as initiator, was studied. The strongerthe electron-donating ability of the aniline derivatives, the faster the the of photopolymerizationwill be. The radical intermediates produced by photoreaction between anthracene and anilinewere detected with ESR spectra. The initiation scheme involves the formation of exciplex betweenthe excited singlet state of CAH and the ground state of aniline as the first step, and then followedby proton transfer, leading to the generation of two kinds of radicals. From the end-group analysisof the polymers obtained, it is suggested that both kinds of radicals are involved in the initiation.     

流动注射化学发光抑制法测定维生素E

实验发现,H2SO4-KMnO4-甲醛在丙酮存在下发光信号大大增强,据此建立了H2SO4-KMnO4-甲醛-丙酮新体系。同时发现维生素E(VE)对H2SO4-KMnO4-甲醛-丙酮化学发光体系有强烈的抑制作用,建立了维生素E的流动注射化学发光抑制法的新体系。化学发光信号的降低值与VE的浓度在1.0×10-5~1.0×10-3mol/L的范围内呈良好的线性关系,方法的检出限为3.0×10-6mol/L。对1.0×10-4mol/L的VE进行11次平行测定,其相对标准偏差为1.5%。该法已用于VE片剂中VE的测定。     

含二苯甲烷结构四元共缩聚杂萘聚芳酰胺的合成与性能

采用自制二胺1,2-二氢-2-(4-氨基苯基)-4-[4-(4-氨基苯氧基)-苯基]-二氮杂萘-1-酮、商品二胺4,4′-二氨基二苯甲烷和对苯二胺与对苯二甲酰氯进行低温溶液缩聚反应,改变三种二胺的比例,得到了一系列共聚酰胺树脂,其特性粘数为1·24~2·32dL/g,用FT-IR、1H-NMR手段研究了聚合物的结构;利用DSC和TGA研究了聚合物的耐热性能,结果表明,该类聚合物具有较高玻璃转化温度(301℃以上);氮气气氛中5%热失重温度在438℃以上;用一定比例的二胺制得的聚合物分别能溶于N-甲基吡咯烷酮、N,N-二甲基乙酰胺等非质子极性溶剂中并浇注得到韧性薄膜.     

Synthesis and Crystal Structure of a New Organic-inorganic Hybrid One-dimensional Polymer： [Zn（C8H23N5）]2（Pb3I10）

1 INTRODUCTION Recently, the organic-inorganic hybrid Ⅳa groupmetal halides with low-dimensional structure haveattracted much attention of chemists and physicistsdue to their particular properties and applications.For example, they are akin to “natural quantum-well”architectures and have tunable excitonic propertiesusually governed by the inorganic substructure andorganic component[1]; they have been applied assome technologically important materials, such assemiconductor materials in …     

对固体圆二色光谱测试方法的再认识——兼谈“浓度效应”

对近期发展的固体圆二色(CD)光谱测试方法进行了概述、评价和比较, 着重探讨了“浓度效应”的存在使固体CD光谱失真的原因. 通过对本课题组和其他作者已报道的四种化合物的固体CD谱再测试的反思, 强调了依手性化合物的手性光谱学性质不同, 根据浓度梯度实验选择其合适测试浓度的必要性. 对固有手性的阻转异构化合物(S)-1,1'-联二萘酚(S-BINOL)进行了成膜法固体CD谱浓度梯度测试, 发现所得固体薄膜CD谱中也存在着“浓度效应”     

珠江广州河段水中有机污染物的GC-MS分析

用吹扫捕集、树脂富集珠江广州河段海印断面水中有机物，毛细管色谱柱分离，用气相色谱－质谱联用方法测定有机污染物的组成，从水中鉴定出60个有机物，并作了定量分析；结果表明有机物种类多，污染较严重。