Important property of polymers of PVC pipes is:
Correct answer: D. Can be softened repeatedly on heating and hardened when cooled with little change in property
- A. They decompose when heated
- B. Become hard on heating and cannot be softened again
- C. Can be softened on heating and hardened when cooled with drastically different properties fromoriginal
- D. Can be softened repeatedly on heating and hardened when cooled with little change in property
Explanation
Polymers used in PVC pipes exhibit the property of thermoplasticity, which means they can be softened upon heating and hardened upon cooling without undergoing significant chemical changes or degradation. This property allows PVC pipes to be easily molded and shaped during manufacturing processes and makes them suitable for various applications in plumbing and construction.When PVC pipes are heated, the polymer chains gain enough thermal energy to overcome intermolecular forces, allowing the material to soften and become malleable. As a result, the PVC pipes can be reshaped or formed into desired configurations. Upon cooling, the polymer chains re-solidify, and the material returns to its original hardened state, retaining its mechanical properties.
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About Transition Elements
Transition elements are identified by their partially filled d subshells in atoms or common ions. The topic covers the electronic structure of d-block elements, including the filling order of 4s and 3d orbitals, variable oxidation states and the distinction between transition elements and elements with completely filled d subshells.
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