Theoretical MFI Values of Common Polymeric Materials Reference

In summary, theoretical MFI values are used to determine the flow properties of polymeric materials in their molten state and are calculated using the molecular weight, viscosity, temperature, and pressure. These values may vary from actual MFI values due to factors such as processing conditions and additives. Theoretical MFI values can differ significantly among different materials and having a reference for common values is important for material selection and predicting flow properties.
  • #1
Rathy Cato
11
0
Where can i get the theoretical value of MFI for common polymeric materials such as PP, PE, PS, PMMA...as reference?
 
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  • #2
I do not think there are theoretical calculations for such an empirical parameter. May be you could try to compare viscosities but keep in mind they are generally shear-dependent while the MFI test does not give you any info about shear dependence.
 

1. What is the purpose of calculating theoretical MFI values for polymeric materials?

Theoretical MFI (Melt Flow Index) values are used to determine the flow properties of a polymer in its molten state. This information is important for predicting the behavior of the polymer during processing, such as injection molding or extrusion.

2. How are theoretical MFI values calculated?

Theoretical MFI values are calculated using the molecular weight and viscosity of the polymer, as well as the temperature and pressure at which the measurement is taken. These values are then used in an equation to determine the theoretical MFI value.

3. Are theoretical MFI values the same as actual MFI values?

No, theoretical MFI values are calculated based on the properties of the polymer, while actual MFI values are measured experimentally. Actual MFI values may vary from theoretical values due to factors such as processing conditions and the presence of additives.

4. How do theoretical MFI values vary among different polymeric materials?

Theoretical MFI values can vary significantly among different polymeric materials due to their different molecular structures and viscosities. For example, a material with a higher molecular weight will generally have a lower theoretical MFI value than one with a lower molecular weight.

5. Why is it important to have a reference for common polymeric materials' theoretical MFI values?

Having a reference for common polymeric materials' theoretical MFI values allows for easier comparison and selection of materials for specific processing applications. It also provides a baseline for determining the expected flow properties of a particular polymer.

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