Explain how macroscopic hardening occurs in semicrystalline polymers from the point of view of microscopic mechanisms (covered in the chapters indicated in the Callister's book). (maximum of 3 lines, not counting the space for possible schematic figures).

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Explain how macroscopic hardening occurs in semicrystalline polymers from the point of view of microscopic mechanisms (covered in the chapters indicated in the Callister's book). (maximum of 3 lines, not counting the space for possible schematic figures).

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Introduction:

Strain hardening is not basically affected by the degree of crystallinity. In semicrystalline polymers, It is explained at the microscopic level with the help of rubber elasticity theory, especially for the necking region by introducing the concept of lamellar crystalline plates and fibrillar microstructure. 

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