Which of the following has less crystallinity?

Which of the following has less crystallinity?

Right Answer is:

Iron

SOLUTION

  • Crystallinity refers to the degree of structural order in a solid.
  • High-density polyethylene (HDPE) and low-density ethylene (LDPE) are a class of polymers.
  • Low density polythene has less crystallinity.
  • The presence of chain branching will tend to reduce the possibility of an ordered arrangement and so reduce the crystallinity.
  • For example, the crystallinity of LDPE (low-density polyethylene) usually varies between 55% and 70%, compared with 75%-90% for HDPE (high density polyethylene).
  • Semi-crystalline materials have a highly ordered molecular structure with sharp melt points.
  • They do not gradually soften with a temperature increase, instead, semi-crystalline materials remain solid until a given quantity of heat is absorbed and then rapidly change into a low viscosity liquid.
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