氨酯丙烯酸酯树脂的合成及其固化反应动力学研究

用不同分子量的聚氧化丙烯二元醇合成了一系列氨酯丙烯酸酯齐聚物（ＵＡＯ）以及含硬段／软段结构的ＵＡＯ，并用ＦＴ－ＩＲ跟踪了这类ＵＡＯ的合成过程。通过ＵＡＯ的链端双键测定，以及ＧＰＣ、ＶＰＯ测定的分子量，表征了ＵＡＯ的数均官能团度。进一步通过ＦＴ－ＩＲ研究了由ＵＡＯ与甲基丙烯酸甲酯形成的氨酯丙烯酸酯树脂（ＵＡＲ）固化时的共聚反应动力学，发现其共聚反应速率与体系中的扩散效应密切相关。在这类ＵＡＯ中引入硬段后，共聚合体系呈现出反常的动力学行为，与网络结构形成过程中材料的形态发展有关。     

锰(Ⅱ)-高碘酸钾-灿烂绿体系测定水中痕量锰

在 HAc- Na Ac环境中 ,锰 ( )对于高碘酸钾氧化灿烂绿的反应具有很强的催化作用。据此 ,建立了催化动力学光度法测定痕量锰 ( )的新方法。该方法的检出限为 2 .2 2× 10 -11g/ m L ,测定线性范围为0 .1— 12 ng/ m L。直接用于环境水样中锰的测定 ,获得满意的结果     

Knoevenagel condensation catalysed by poly（vinyl chloride） supported tetraethylenepentamine （PVC-TEPA）

Poly(vinyl chloride) supported tetraethylenepentamine (PVC-TEPA) has been found to be an efficient catalyst for the Knoevenagel condensation. A wide range of aromatic aldehydes easily undergo condensations with ethyl cyanoacetate and malononitrile in the commercial 95% ethanol in refluxing using PVC-TEPA as catalyst to afford the desired products of good purity in moderate to excellent yields. A recycling study confirmed that the catalyst could be reused, the yield of the desired condensation product were not reduced. The merits of this protocol are environmentally benign, simple operation, convenient work-up and good yields. Furthermore, the catalyst can easily be recovered and reused at five times with comparable yields.     

催化光度法测定痕量钼—钼（Ⅵ）—盐酸联氨—橙黄Ⅳ催化光度新体系

基于盐酸介质中，钼（Ⅵ）催化盐酸联氨还原橙黄Ⅳ的反应，建立了动力学分光光度法测定痕量钼的新方法。本法检出限为３．７×１０＾－３μｇ／ｍＬ，测定钼量范围为０．０２５～１．８μｇ／ｍＬ。已将此法用于测定绿豆中的钼及钼酸铅和钼酸钡的溶度积。     

Facile Synthesis of 1, 2-Diazepine Derivatives under Microwave Irradiation

An efficient and convenient synthesis of 3, 5, 7-triaryl-4H-1, 2-diazepine from 2, 4,6-triarylpyrylium salts and hydrazine in water under microwave irradiation is reported. The same reaction can be conducted using 2, 4, 6-triarylthiopyrylium salts and hydrazine.