copolymer

Thân thiện

A scientist holds a model of a copolymer chain in a chemistry lab.

Definition

Noun: A copolymer is a type of polymer formed from two or more different types of monomers (the small, repeating molecular units that link together to form a polymer). This combination results in a material with properties distinct from those of a homopolymer, which is made from only one type of monomer.

Usage and Examples

• The new plastic is a copolymer of ethylene and propylene, giving it both flexibility and strength.
• Scientists developed a special copolymer for the medical implant by combining lactic acid and glycolic acid monomers.
• The properties of a copolymer, such as its melting point or elasticity, depend on the types and arrangement of its constituent monomers.

Advanced Usage and Concepts

• Types of Copolymers: The sequence in which the different monomers are arranged is crucial and defines the copolymer type.
  • Alternating copolymer: Monomers A and B alternate in a regular pattern (e.g., -A-B-A-B-A-B-).
  • Random copolymer: Monomers A and B are arranged in a random, irregular sequence along the chain.
  • Block copolymer: Long sequences (blocks) of monomer A are followed by long sequences of monomer B (e.g., -AAAAA-BBBBB-).
  • Graft copolymer: The main chain is made of one monomer, with branches of a different monomer attached to it.

Variants and Related Words

• Copolymerize (verb): To undergo or cause to undergo copolymerization.
  • The two monomers readily copolymerize to form a useful elastomer.
• Copolymerization (noun): The chemical process of forming a copolymer.
• Homopolymer (noun): A polymer formed from only one type of monomer (e.g., polyethylene).
• Terpolymer (noun): A copolymer formed from three different types of monomers.

Synonyms

• Heteropolymer
• Mixed polymer

(Note: There are no specific idioms or phrasal verbs associated with the technical term "copolymer.")

Học thuật

Noun

1. a polymer consisting of two or more different monomers