About Branching Analysis of Polyolefin Polymers

Polyolefin manufacturers control the branching of their materials in order to modify the physical and thermal properties.  The use of various catalysts and comonomers allow for substantial changes in the amount and type of branching.

Low density Polyethylene (LDPE) has a high level of branching. 

High density polyethylene (HDPE) has minimal branching. 

Linear low density polyethylene (LLDPE) has significant levels of short branches.

  • Approach

    1. Samples are dissolved in heated deuterated o-dichlorobenzene and 1,2,4-Trichlorobenzene.

    2. Quantitative 13C NMR is performed hot to ensure dissolution.

    3. The spectra is analyzed for signals attributed to terminal methyl carbons (branch points) and for signals related to branch length from 1 to 6 carbons (branch length capabilities can vary depending on signal quality).

  • Sample Considerations

    300 milligrams of unfilled polymer are required to complete the testing.

  • Experience

    This testing may be applicable to multiple polyolefin polymers and copolymers.  We’ve tested a large variety.  Contact us if you would like to know if we can apply this technique to your material.