Copolymer is a polymer derived from more than one type of monomer. Distinctive features of copolymers include better impact properties, more transparency, less fog properties, reduced melting point and increased flexibility, and so on.
Copolymers have many applications, including pipe extrusion, molding and blowing films, thermal forming, injection molding for home appliances, and so on.
What is a copolymer?
Polymers are divided into two groups according to the monomer present in the reaction of hemopolymer and copolymer. When a polymer is made of only one type of monomer (or small molecule) that is connected to each other, it is called a homopolymer. But when two different types of monomers are placed in the same polymer chain, the polymer is called a copolymer.
The copolymers obtained from the copolymerization of two different types of monomers are called biopolymers, and those consisting of three or four monomers are called triplemers and quaternipliers, respectively. The advantage of copolymers over homopolymers is that they can be used to participate in copolymerization with monomers with desirable properties.
Types of copolymers?
There are different types of copolymers depending on how their monomers are arranged, including batch, alternating, random, and bonding copolymers. There are more than one type of homopolymer in the structure of batch copolymers, which are connected to each other by bundles due to covalent bonding. In intermittent copolymers, repeating monomeric units are intermediately placed within the polymer chain. Also in random copolymers, there is a mixture of repeating monomeric units that are randomly distributed in a polymer chain. In transplanted copolymers, the lateral branches are also placed on the main hemopolymer chain.
Properties of copolymers?
The properties of this material clearly depend on how the units A and B are distributed in the copolymer chains. If monomers A and B react together to form a copolymer, they will often have completely different properties than the physical mixture of two separate copolymers, A and B.
The distribution of monomers should not necessarily be equal to the ratio of the concentrations of monomers A and B in the primary mixture. In general, in a copolymer consisting of monomers A and B, if the monomer A is more active, the copolymer formed in the early stages is richer than A in B, but in the later stages of the reaction, because the concentration of monomer A decreases, the copolymer The formed will mostly include B.
Related links: Plastic and polymer raw materials, copolymer resin
