硫化胶制样技术对红外光谱分析的影响

Influence of Vulcanisate Sample Preparation on Infrared Spectroscopic Analysis

样品粒径对硫化胶网络主链α－亚甲基浓度影响较大，但对侧甲基浓度影响甚微。样品粒径减小会导致样品严重氧化，因此压片法红外光谱分析要严格控制样品粒径。样品浓度对分析结果也有较大影响。在样品粒径小于２μｍ、样品与溴化钾质量比为（１～５）：１０００时，可获得较为理想的红外光谱图。

Grain size of the vulcanisate sample exerts a tremendous influence on the concentration of a-methylene in the vulcanisate network but a slightest effect on the concentration of the methylside groups. A reduced sample grain size will result in a strong oxidation, thus the KBr disc technique for infrared spectroscopic analysis requires a strict control of the sample grain size. Furthermore, the sample concentration will also have a considerable influence on the re suit of the analysis. When the sample is pulverized into grains of less than 2μm and the mass ratio of the sample and KBr is in the range of 1: 1000-5: 1000,a spectrum of high resolution can be obtained.