Author Question: Describe the key features of a polymer that would make it electrically conductive. What will be ... (Read 13 times)

jho37 · **on:** Aug 19, 2018

Describe the key features of a polymer that would make it electrically conductive.

What will be an ideal response?

Question 2

What is the limiting oxygen index (LOI)? Which burns more easily, a material with an LOI of 21 or of 17?

What will be an ideal response?

billybob123 · **Reply #1 on:** Aug 19, 2018

Answer to Question 1

Electrical conductivity results from the ability of electrons to move freely within the material's structure. This can occur in polymers when the electrons are delocalized. One method to achieve delocalization is when the bonds in the polymer are conjugated double bonds. Another method to achieve conductivity is to add a conductive filler to the plastic material.

Answer to Question 2

The LOI is a test for flammability of a plastic sample. In this test the sample is supported in a candle-like arrangement and ignited. The composition of the gases surrounding the burning sample is controlled and gradually the amount of oxygen is reduced or increased until the sample will just barely burn. That level of oxygen is called the limiting oxygen index. The sample with an LOI of 17 is more easily burned.