溴化丁基橡胶产品溴含量的测定.pdf

溴化丁基橡胶产品溴含量的测定 溴化丁基橡胶产品溴含量的测定 摘 要 1 本文分别用 H-NMR 、氧弹燃烧法、热重法及紫外-可见吸收光谱 法测定了不同牌号的溴化丁基橡胶的溴含量。通过比较发现，1H-NMR 分析法，氧弹燃烧法、热重分析法与紫外-可见吸收光谱法都可以进行 1 定量分析，H-NMR 方法操作简单、测试周期短，分析结果准确度较高， 而热重法测试结果偏高，紫外-可见吸收光谱法的重复性较差，可作为 一般的研究之用。另外，研究了氧弹燃烧方法测定溴化丁基橡胶的溴含 量及试验条件对测试结果的影响，结果准确度也较高，安全可靠。并且 利用 1H-NMR 谱图表征溴化丁基橡胶的微观结构。 另外，还考察了环氧滴定法测定溴化丁基橡胶的不饱和度，这种方 法操作简单方便，精确度也比较高。通过使用这种方法，能够表征出溴 化丁基橡胶的产品性能，对研究丁基橡胶的溴化反应提供了理论支持。 关键词：溴化丁基橡胶，溴含量，不饱和度 III 溴化丁基橡胶产品溴含量的测定 BROMINATION BUTYL RUBBER PRODUCT BROMINE CONTENT ABSTRACT Bromine content of bromobutyl rubber is determined by 1H-NMR spectroscopy, oxygen bomb combustion, thermogravimetru(TG) and ultraviolet-visible absorption spectrometry(UV-VIS) respectively. The methods of 1H-NMR, UV-VIS and TG are relative simple and 1H-NMR analytic results are correct and relative accurate, and it is able to use for industrial analysis, but analytic results of TG is high, UV has poor reproducibility. Otherwise the analytic result of oxygen bomb combustion is also correct, but it is much more complex than 1H-NMR and TG. It also can be used for industrial analysis, if conditions allowed. Moreover, a simple method of epoxidation titration is used to test the unsaturation of the bromobutyl rubber. This method is easy to operate and its result is correct. These methods which front mentioned can be used to truely characterize bromobutyl rubber’s properties, providing the theory support to the study of the butyl rubber’s bromination reaction. Key words: bromobutyl rubber ，unsaturation ，bromine content IV