Sure, I'd be happy to help. Here are the definitions of the terms you asked about:

* **Elastomer**

An elastomer is a material that can be stretched and deformed elastically without permanent damage. Elastomers are typically made of polymers, which are long chains of molecules that are held together by weak intermolecular forces. These weak forces allow the chains to slide past each other, which is what gives elastomers their ability to stretch.

Some common examples of elastomers include natural rubber, synthetic rubber, and silicone. Elastomers are used in a wide variety of applications, including tires, gaskets, seals, and hoses.

* **Viscoelasticity**

Viscoelasticity is a property of materials that exhibit both viscous and elastic behavior. Viscosity is a measure of a material's resistance to flow, while elasticity is a measure of a material's ability to return to its original shape after being deformed.

Elastomers are viscoelastic materials. When an elastomer is stretched, it flows like a liquid. However, when the force is removed, the elastomer returns to its original shape like an elastic material.

* **Intermolecular forces**

Intermolecular forces are forces that act between molecules. These forces are responsible for holding molecules together in a solid or liquid state.

There are four main types of intermolecular forces:

    * **Van der Waals forces** are the weakest type of intermolecular force. They are caused by the temporary uneven distribution of electrons in a molecule.
    * **Dipole-dipole forces** are stronger than van der Waals forces. They occur between molecules that have permanent dipoles.
    * **Hydrogen bonding** is a type of dipole-dipole force that occurs between molecules that contain hydrogen atoms bonded to electronegative atoms such as oxygen or nitrogen.
    * **Ion-dipole forces** occur between ions and molecules that have permanent dipoles.

The strength of intermolecular forces determines the physical properties of a material. For example, materials with strong intermolecular forces have high melting and boiling points.
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