What is the primary characteristic of a polymer with randomly arranged chains?

The primary characteristic of a polymer with randomly arranged chains is indeed a low melting temperature. Polymers that have a random arrangement of their molecular chains typically have less ordered structures compared to those with highly crystalline arrangements. This disorganization results in less strength and more flexibility in the material.

The random arrangement of chains impairs the ability of the polymer to achieve a high melting temperature because the intermolecular forces holding the chains together are not as strong as those in more ordered, crystalline polymers. As a result, these randomly organized chains can move more freely when heat is applied, causing the material to melt at lower temperatures. This flexibility is often beneficial for applications where moldability and ease of processing are important.

In contrast, polymers with high tensile strength, high rigidity, or excellent electrical conductivity generally possess more ordered structures or specific properties that allow them to maintain their integrity under stress or reduce the mobility of charge carriers. Such features are not characteristic of polymers with randomly arranged chains.