Relation between thermal conductivity factor(k) and temperature coefficient of resistance(α)
They represent two different things:


The temperature coefficient of resistance (or α) symbolizes the resistance change factor per degree of temperature change. Just as all materials have a certain specific resistance (at 20°C), they also change resistance according to temperature by certain amounts. (Source: this page, where you can find a detailed explanation with examples.)
The thermal conductivity factor only shows how easily the material conducts heat. As an example, metals get hot much faster than, for example, air or plastic. It is all written in details in the article you posted. (here)


Those two factors are not correlated to each other, as each one depends on the material and represent a different property.