when a plastic film is cut,what kind of bonding is broken ?
Intermolecular forces
•Intermolecular force can be cohesive between like molecules in surface tension or adhesive between unlike molecules.
•Plastics and paper are composed of polymer molecules, and their physical properties are greatly influenced by the intermolecular forces between these molecules.
•When PE film is punctured or melted, what are broken are only the intermolecular forces holding PE molecules, whereas the much stronger covalent bonds holding the C and H atoms remain unaffected.
•Weak intermolecular forces low strength, Tm