Why Does Crystallinity Affect Strength?

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SUMMARY

Crystallinity significantly influences the strength of materials, as demonstrated by Kevlar, a crystalline structured polymer. The discussion highlights that in crystalline structures, such as diamond, particles are tightly bonded with surrounding particles, resulting in higher strength. In contrast, graphite, which also has covalent bonds, exhibits a layered structure where particles do not bond with all surrounding particles, leading to reduced strength. This fundamental difference in structure is crucial for understanding material properties.

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wais
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Hi,

I found out that Kevlar is a crystalline structured polymer, and this is one of the factors about why its so strong. Could someone explain to me why crystallinity affects strenght?

Thanks.
 
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well, with crystal structures a single particle will have covalent bonds with surrounding particles say for example diamond

then in comparison with graphite both graphite and diamond are covalently bonded but the structure is rather different
graphite is in layers where the particles are not bonding with all the surrounding particles

http://www.chemguide.co.uk/atoms/structures/giantcov.html
i am not good at explaining
 

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