What is the Difference Between Copolymer and Terpolymer?

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The main difference between a copolymer and a terpolymer lies in the number of monomers involved in the polymerization process.

  • Copolymer: A copolymer is a polymer derived from the polymerization of two different monomers. It contains more than one type of repeating unit, and the process of polymerization that forms a copolymer is called "copolymerization". Examples of copolymers include ethylene-vinyl acetate (EVA) and styrene-butadiene co-polymer (SBR).
  • Terpolymer: A terpolymer is a type of polymer that is made of three different types of monomers. Terpolymers are a subset of copolymers, specifically obtained from the copolymerization of three monomer species. An example of a terpolymer is acrylonitrile butadiene styrene (ABS), which is made from the polymerization of acrylonitrile, butadiene, and styrene monomers.

In summary:

  • Copolymers are polymers consisting of two or more different types of monomers.
  • Terpolymers are a type of copolymers that consist of three different types of monomers.

Comparative Table: Copolymer vs Terpolymer

The main difference between a copolymer and a terpolymer is the number of different types of monomers involved in their formation. Here is a comparison table highlighting the differences between copolymers and terpolymers:

Copolymer Terpolymer
Consists of two different types of monomers Consists of three different types of monomers
Formed through a process called "copolymerization" Formed through a process called "terpolymerization"
Examples include poly(ethylene-co-propylene) and poly(styrene-co-butadiene) Examples include poly(ethylene-co-propylene-co-xylenes) and poly(methyl methacrylate-co-maleic anhydride-co-α-olefins)

Both copolymers and terpolymers are types of polymers consisting of different types of monomers, but terpolymers are a specific type of copolymers that have three different types of monomers.