Block Copolymer Definition

Block Copolymer Definition: A block copolymer is a copolymer formed when the two monomers cluster together and form 'blocks' of repeating units.

For example, a polymer made up of X and Y monomers joined together like:

-Y-Y-Y-Y-Y-X-X-X-X-X-Y-Y-Y-Y-Y-X-X-X-X-X-

is a block copolymer where -Y-Y-Y-Y-Y- and -X-X-X-X-X- groups are the blocks.

Example: The material used to make automobile tires is a block copolymer called SBS rubber.

The blocks in SBS rubber are polystyrene and polybutadine (StyreneButatineStyrene)

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Helmenstine, Anne Marie, Ph.D. "Block Copolymer Definition." ThoughtCo, Apr. 9, 2016, thoughtco.com/definition-of-block-copolymer-604834. Helmenstine, Anne Marie, Ph.D. (2016, April 9). Block Copolymer Definition. Retrieved from https://www.thoughtco.com/definition-of-block-copolymer-604834 Helmenstine, Anne Marie, Ph.D. "Block Copolymer Definition." ThoughtCo. https://www.thoughtco.com/definition-of-block-copolymer-604834 (accessed May 25, 2018).