Thermal field flow separator

The thermal field flow separator is a very powerful separation and analysis instrument that can not only separate samples according to their size/volume, but also according to their chemical properties. There are two separation principles: fluid mechanics volume separation and thermal diffusivity chemical property separation. It is suitable for the separation and analysis of polymers and polymer materials in weakly polar organic solvents and medium polar organic solvent systems such as DMF/DMAC/DMSO.

　　Thermal field flow separator, is a very powerful separation and analysis instrument: it can not only separate according to the size/volume of the sample, but also according to the chemical properties of the sample! This is because the thermal field adopts the principle of thermal diffusion separation, making it particularly suitable for the analysis of blends.

　　Thermal field flow separatorThe application in the rubber field is very typical: it can not only analyze the molecular weight/molecular weight distribution of the polymer in the rubber, but also separate the gel material and test its content. Compared with traditional weighing methods, thermal field TF3 greatly saves time, significantly improves testing accuracy, repeatability, and reproducibility. Currently, it has been adopted by most rubber products, tire companies, and research and development units in the world, and will become the standard method for rubber analysis in the future.

Like other field flow instruments, the thermal field also has the ability to adjust the separation process. This ability is particularly useful in the separation of blends.

The DMF/DMAC/DMSO system is also one of the advantages of thermal field TF3. The traditional SEC/GPC method requires the addition of corrosive chemicals such as lithium bromide and lithium chloride (imported chromatographic purity and spectral purity) in these three mobile phase systems to further enhance the corrosiveness of the mobile phase solution; However, ordinary GPC columns or even corrosion-resistant GPC columns cannot withstand the long-term corrosion of these mobile phases, ultimately affecting the accuracy of molecular weight distribution data. And the thermal field TF3 solves these problems very well. Since it does not have a fixed phase filler like AF4, it can withstand the corrosion of medium polarity mobile phases and accurately determine the molecular weight distribution of the dissolved polymers in the above three mobile phase systems. By directly combining with multi angle laser scattering detector MALS, intrinsic viscosity detector IV, dynamic laser particle size detector DLS, etc., a large amount of information about the sample can be obtained: absolute molecular weight, mean square rotation volume, fluid dynamics volume, intrinsic viscosity, branching degree, etc. Even the thermal field TF3 can be directly combined with qualitative instruments such as nuclear magnetic resonance NMR and Raman spectrometer online, further obtaining a large amount of deep structural information.