copolymer


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copolymer:

see polymerpolymer
, chemical compound with high molecular weight consisting of a number of structural units linked together by covalent bonds (see chemical bond). The simple molecules that may become structural units are themselves called monomers; two monomers combine to form a dimer,
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Copolymer

 

a polymer whose macromolecules contain several types of monomeric units. In regular copolymers, the different units are arranged in periodic fashion. The simplest examples are copolymers of styrene with maleic anhydride and copolymers of certain olefins with SO2, constructed in the order . . . ABABAB . . . , where A and B are different types of monomeric units. More complicated regular sequences, with an alternating arrangement of units, are characteristic of, for example, the various amino-acid residues in certain proteins, such as the glycine-proline-hydroxyproline sequence in collagen. In irregular copolymers, the distribution of monomeric units is random, which is characteristic for many synthetic copolymers. In nucleic acids and most proteins, the irregular sequences of units are prescribed by a corresponding code, and it is these sequences that determine the biochemical and biological specificities of the corresponding compounds.

Copolymers in which the monomeric units of each type form rather long continuous sequences (blocks) that replace one another within the macromolecule are called block copolymers. One or several chains having a chemical composition different from that of the macromolecular chain may be added to the internal (nonterminal) monomeric units of the chain. Copolymers of this type are referred to as graft copolymers.

Materials with a given set of properties can be prepared by combining chemical units of various types in a single macromolecule. Thus, the synthesis of copolymers is one of the most effective means for modifying the properties of high-molecular-weight compounds.

REFERENCE

Entsiklopediiapolimerov, vols. 1–2. Moscow, 1972–74.

V. A. KABANOV

copolymer

[kō′päl·i·mər]
(organic chemistry)
A mixed polymer, the product of polymerization of two or more substances at the same time.
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Maltodextrin/VP copolymer provides the formulator with a new option to satisfy customer and consumer demands for more natural styling products without any compromise on performance.
Since the block copolymer was designed and synthesized with the right composition, the slow evaporation of the solvent over several days led to the spontaneous segregation of the PtBA and PCEMA blocks in the solid state from the matrix PS block into core-shell cylinders (A [right arrow] B).
Copolymers of PVDC containing small amounts of monomers, such as vinyl chloride, methyl methacrylate and acrylonitrile, offer improved processability because of their reduced melting points.
More difficult questions were approached by MS/MS methods analogous to those used in the copolymer studies discussed earlier.
Acrylonitrile-Butadiene-Styrene Copolymer (ABS): 2011 World Market Outlook And Forecast Published: February, 2011 Pages: 253 http://mcgroup.
Py/NptPy-TTAB copolymer modified glassy carbon disc electrode (GCE) was used as working electrode, platinum wire and Ag/AgCl electrodes were used as counter and reference electrodes, respectively.
Homogeneous distribution of energy induced that copolymer which was synthesized by MAPS method, was more monodisperse than copolymer synthesized by THPS method.
Keywords Superhydrophobic, Phase separation, Fluorine-silicon copolymer, Contact angle
Located in the Nanjing Chemical Industrial Park, the site produces Vinnapas VAE copolymer dispersions with a current capacity of approximately 50,000 metric tons per year, depending on product mix.
Carbobond 2862 copolymer features rapid sealing at low activation temperatures.
In addition, the size of the surface patterns unexpectedly displayed an inverse relationship with molecular mass that can be attributed to the copolymer surface elasticity.
Poly(ethylene-b-ethylene oxide) block copolymer (PE-b-PEO) with a molecular weight of 2,250 g/mol and 80 wt% PEO block content and N-(4-ethoxybenzylidene)-4-butylaniline nematic liquid crystal (EBBA) with 98% purity, were purchased from Sigma-Aldrich.