Question

PVC have more intermolecular force of attraction than natural rubber?

Answer 1

PVC consists of polar molecules which are attracted to each other by dipole-dipole interactions due to electrostaticattractions of a chlorine atom in one molecule to a hydrogen atom in another atom: These considerable intermolecular attractions betweenpolymer chains make PVC a fairly strong material.

Natural rubber has week interaction
there is no polar group in polyisoprene, which means that the intermolecular forces are weak van der wall forces of attraction, also known as dipole-dipole forces