How do you know the Modulus value for the reference sample?

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replied on Wed, Mar 3 2010 4:52 AM

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Symply because we use standard reference mixtures of polymers. For HarmoniX measurements for instance, you have the choice between:

PS (polystyrene matrix) / PE (inclusions of polyolefin elastomer): PS is ~2GPa and PE ~100MPa

or:

PS / EPDM (monomers of propylene diene: PS is ~2GPa and EPDM is ~10MPa, is you want to target softer samples.

If you use Peak Force QNM, we have a wider range of calibration samples.

Alex.

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Senthil replied on Tue, Feb 15 2011 3:47 AM

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For instance, if we have a heterophasic material having individual modulus of ca. 50 GPa and 1 MPa, will these calibration samples still yield quantative results?

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replied on Thu, Mar 3 2011 4:16 PM

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(sorry for the delay in my answer)

Well, this is a difficult case because we have calibration kits for 1 MPa samples (actually this is the softest one we have) and others for 50GPa but we don't have any sample that covers this whole range. So if you chose one of those, the calibration might not be super accurate for a certain portion of your sample. The best is to work with a polymer lab that can make you a customized sample covering the range you need.

Alex.