方案摘要
方案下载应用领域 | 石油/化工 |
检测样本 | 其他 |
检测项目 | |
参考标准 | - |
Polyvinyl alcohol (often abbreviated as PVOH) is a water-soluble synthetic material used as an emulsifier and adhesive. PVOH can be modified by reaction of pendant –OH groups with various reagents to form new polymers with novel surfactant properties. Gel permeation chromatography (GPC) is a well-known technique for assessing the molecular weight distribution of polymers, a property that influences many of their physical characteristics. GPC viscometry employing a viscometer in combination with a differential refractive index detector may be used to determine accurate molecular weights for polymers based on the universal calibration approach, useful for materials for which narrow standards are not available. GPC viscometry can also be used to investigate the solution behavior of modified polymers, a useful tool in the analysis of surfactant materials. This application note describes the analysis of two PVOH materials by GPC viscometry – one pure PVOH, and one that had been modified by reaction with imidazole. This second material was insoluble in water so for comparison both materials were analyzed in a polar organic solvent, dimethyl sulfoxide.
使用 Agilent 8890 气相色谱和 TCD/FID 系统分析氢气中的氦气、 氩气、氮气和烃类杂质
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使用配备氦气节省模块以进行载气 切换的 Agilent 8850 气相色谱系统 分析香草提取物的方法转换
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