Extrusion Monitoring of Polymer Melts Using a High‐Temperature Surface‐NMR Probe
Extrusion Monitoring of Polymer Melts Using a High‐Temperature Surface‐NMR Probe
复制标题
使用高温表面核磁共振探针监测聚合物熔体的挤出
DOI：
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复制
发表时间：
2005
期刊：
影响因子：
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通讯作者：
U. Scheler
中科院分区：
文献类型：
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作者：
A. Gottwald;U. Scheler
挤出是聚合物加工的主要方式之一，挤出过程监控对于控制或改进挤出过程和产品质量具有重要意义。尤其是在线监测的方法是所期望的，因为这些方法能够实现最快可能的响应和反应处理中化学反应的定位。迄今为止，光学和声学光谱学的方法已经成功地实施。NMR提供了丰富的信息。表面NMR主要通过弛豫时间提供分子迁移率。这些可以与温度、组成和均匀性相关，这些都是产品质量的重要指标。NMR是一种非破坏性的方法，不需要直接接触样品，也不限于光学透明材料，因此适用于挤出监测。适应的问题是用于聚合物熔体的挤出机内部和前面的恶劣环境。在这里，NMR表面探头呈现在挤出机前面维持这种环境。显示了使用该设备的第一次测量。
Extrusion is one of the major ways of polymer processing, and extrusion monitoring is important to control or improve the extrusion process and the product quality. Especially methods for in-line monitoring are desired because those enable the fastest possible response and a localization of chemical reactions in reactive processing. Methods of optical and acoustic spectroscopy have successfully been implemented so far. NMR provides a wealth of information. Surface NMR mostly gives access to molecular mobility via relaxation times. These can be correlated to temperature, composition and homogeneity which are substantial indicators for the product quality. NMR is a nondestructive method, which does not require direct contact with the sample and it is not restricted to optical transparent materials and is therefore suitable for extrusion monitoring. The problem for the adaptation is the hostile environment in and in front of an extruder for polymer melts. Here, a NMR surface probe is presented sustaining this environment in front of an extruder. First measurements with this device are shown.