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Introduction to Polymer Chemistry — Chemistry STD 12 Science — Question

Maharashtra BoardEnglish MediumSTD 12 ScienceChemistryIntroduction to Polymer Chemistry4 Marks
Question
Whatis HDP ? How is it prepared ? Give its properties and uses ?
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Answer

 HDP means high density polyethylene. It is a linear polymer with high density due to close packing.

HDP is obtained by polymerization of ethene in presence of Zieglar-Natta catalyst which is a combination of triethyl aluminium with titanium tetrachloride at a temperature of 333K to 343K and a pressure of 6-7 atm.

Properties of HDP :
  • HDP is crystalline, melting point in the range of $144-150^{\circ} C$.
  • It is much stiffer than LDP and has high tensile strength and hardness.
  • It is more resistant to chemicals than LDP.
Uses of HDP :
  • HDP is used in manufacture of toys and other household articles like buckets, dustbins, bottles, pipes, etc.
  • It is used to prepare laboratory wares and other objects where high tensile strength and stiffness is required.

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