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Rigid micrometer-scale fillers

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endzho942:
I have a question for you guys please help me.
If you add rigid micrometer-scale fillers to a polymer, what do you expect for its strength and toughness? Why?

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I figured out that rigid micrometer-scale fillers to a polymer often increases its strength but decreases the toughness. But I could not understand and find why...

Corribus:
Well you should start with what the definitions of strength and toughness are.

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