Which FTIR preparation for polystyrene?

This is used to mix the sample with KBr powder, which is then pressed into a pellet. The pellet is then placed into the FTIR machine for analysis. This method allows for a solid sample preparation and is suitable for analyzing polystyrene for trace elements. In summary, for analyzing polystyrene using FTIR for trace elements, a solid sample preparation method using a Wig-L-Bug and KBr powder is recommended. Liquid sample preparation using similar structures, such as toluene, is not suitable.
  • #1
ecnerwalc3321
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If I have some polystyrene and want to analyze it using FTIR for trace elements, what type of sample preparation should I look into? If I were to use a liquid sample preparation, I wouldn't be able to use say, toluene, because the two structures are similar, correct (aromatic)? On the other hand, if I were to use a solid sample preparation by making the KBr disk, could I just have a chunk of polystyrene sandwiched in the middle (how do you grind up small amounts of polystyrene)?
 
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  • #2
ecnerwalc3321 said:
If I have some polystyrene and want to analyze it using FTIR for trace elements, what type of sample preparation should I look into? If I were to use a liquid sample preparation, I wouldn't be able to use say, toluene, because the two structures are similar, correct (aromatic)? On the other hand, if I were to use a solid sample preparation by making the KBr disk, could I just have a chunk of polystyrene sandwiched in the middle (how do you grind up small amounts of polystyrene)?

We use a small ball mill called a Wig-L-Bug.
 

1. What is FTIR preparation for polystyrene?

FTIR preparation for polystyrene refers to the process of preparing a sample of polystyrene for analysis using Fourier transform infrared (FTIR) spectroscopy. This involves creating a thin film or pellet of the sample to be placed in the FTIR instrument for measurement.

2. Why is FTIR preparation necessary for polystyrene?

FTIR preparation is necessary for polystyrene because it allows for more accurate and reliable analysis of the sample. Polystyrene is a complex polymer that can exhibit different properties depending on its preparation method and environmental conditions. FTIR preparation ensures that the sample is in a consistent and uniform state, which is crucial for obtaining meaningful data.

3. What are the different methods of FTIR preparation for polystyrene?

There are two main methods of FTIR preparation for polystyrene: the thin film method and the KBr pellet method. The thin film method involves dissolving the sample in a solvent and spreading it onto a flat surface to create a thin film. The KBr pellet method involves mixing the sample with potassium bromide (KBr) powder and pressing it into a pellet for analysis.

4. How do I choose between the thin film and KBr pellet methods for FTIR preparation of polystyrene?

The choice between the thin film and KBr pellet methods for FTIR preparation of polystyrene depends on the solubility of the sample and the type of information needed. The thin film method is better for samples that are soluble in a solvent and can provide information about the functional groups present. The KBr pellet method is more appropriate for insoluble samples and can provide information about the overall structure of the sample.

5. Are there any other factors to consider when preparing polystyrene for FTIR analysis?

Yes, there are a few other factors to consider when preparing polystyrene for FTIR analysis. These include the thickness of the film or pellet, the homogeneity of the sample, and the environmental conditions during preparation. It is important to follow standardized procedures and use high-quality materials to ensure reliable and reproducible results.

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