Polycarbonate regrind properties

[singerk]

Can someone Please advise what mechanical properties are affected by adding regrind to Polycarbonate - and how? Does Modulus go up? I'm assuming that Yield Strength goes down. Using Lexan 940. Thanks for any help!

 

[patprimmer]

Modulus goes up if you get cross linking.

Normally the thermal history and moisture contained in the resin while processing cause chain scisson and some cross linking and even some degradation to carbon.

This results in either an increase or decrease in tensile, depending on the degree of degradation. moderate degradation can increase tensile while more severe decreases it.

Modulus is increased.

Elongation and impact are decreased.

The material will lose clarity via a yellowing of the material.

MFI is increased.







Regards
Pat
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