Long chains of chemicals, that can be twisted and molded into products Petroleum is heated at very high temperatures to be broken down into polymers and made into plastic
These include the familiar plastic and rubber materials Many of them are organic compounds that are chemically based on carbon, hydrogen, and other nonmetallic elements; they have very large molecular structures These materials typically have low densities and may be extremely flexible
These are macromolecular materials constructed from simple molecules (=> Monomers) Both natural fibres and cellulose and synthetic fibres are polymers in their chemical makeup
Macromolecules formed by the chemical union of 2 or more identical combining units called monomers
Compounds of very high molecular weights that are made up of a large number of simple molecules which have reacted with one another
Compounds formed by the joining of smaller, usually repeating, units linked by covalent bonds These compounds often form large macromolecules (e g , polypeptides, proteins, plastics) [MeSH]
A high-molecular-weight organic compound, natural or synthetic, with a structure that can be represented by a repeated small unit, or mer
Under the Seventh Amendment a polymer is defined as a substance which: Consists of molecules which include a sequence of one or more types of monomer units (the reacted form of a monomer in the structure); Show a molecular weight distribution primarily due to differences in the number of monomer units in the individual molecules; Contain 50% or more by weight of molecules containing a sequence of at least three monomer units covalently bound to at least 1 other monomer unit or reactant; Contain less than 50% by weight of molecules with the same molecular weight A polymer becomes notifiable when it contains 2% or more of a new substance as part of its structure Guidance on Polymer Notification
a complex chemical compound formed of many simpler units Cellulose is a sugar polymer and gelatin is an amino acid polymer
compounds of high molecular weight that are built up of a large number of simple molecules, or monomers
A long or larger molecule consisting of a chain or network of many repeating units, formed by chemically bonding together many identical or similar small molecules called monomers. A polymer is formed by polymerization, the joining of many monomer molecules
Polymers are large molecules of high molecular weight They consist of long, repeated and sometimes, branched chains, built up from small sub-units called monomers Natural polymers include proteins (polymer of amino acids) & cellulose (polymer of sugar molecules) There are many examples of synthetic polymers - e g PVC (a polymer of vinyl acetate), PTFE or Teflon (a polymer of molecules containing fluorine and carbon) PTFE is the basis of the Gortex® membrane There are several polymers (both natural and synthetic) used in Nikwax products to provide water-repellency and durability
A high molecular weight substance, natural or synthetic, which can be represented as a repeated small unit (monomer) A copolymer contains more than one type of monomeric unit
Large molecules built up by the combination of many small molecules through a chemical process called polymerization These molecules can consist of many thousands of atoms in chains or networks of repeating units
A high-molecular-weight organic compound, natural or synthetic, whose structure can be represented by a repeated small unit, the monomer (e g , polyethylene, rubber, cellulose) Synthetic polymers are formed by addition or condensation polymerization of monomer If two or more different monomers are involved, a copolymer is obtained Some polymers are elastomers, some plastics (Plastics Engineering Handbook of the Society of the Plastics Industry, Inc , edited by Michael L Berins, 1991)
A polymer is a chemical compound with large molecules made of many smaller molecules of the same kind. Some polymers exist naturally and others are produced in laboratories and factories. a chemical compound that has a simple structure of large molecules (polymeres , from meros ). Any of a class of natural or synthetic substances composed of macromolecules that are multiples of monomers. The monomers need not all be the same or have the same structure. Polymers may consist of long chains of unbranched or branched monomers or may be cross-linked networks of monomers in two or three dimensions. Their backbones may be flexible or rigid. Some natural inorganic materials (e.g., the minerals diamond, graphite, and feldspar) and certain man-made inorganic materials (e.g., glass) have polymer-like structures. Many important natural materials are organic polymers, including cellulose (from sugar monomers; see polysaccharide), lignin, rubber, proteins (from amino acids), and nucleic acids (from nucleotides). Synthetic organic polymers include many plastics, including polyethylene, the nylons, polyurethanes, polyesters, vinyls (e.g., PVC), and synthetic rubbers. The silicone polymers, with an inorganic backbone of silicon and oxygen atoms and organic side groups, are among the most important mixed organic-inorganic compounds
A substance made of specific repeating chemical units or molecules The term polymer is often used correctly or incorrectly, in place of plastic, rubber or elastomer
A substance made of giant molecules formed by the union of simpler molecules Many water clarifiers are made from organic polymers An example would be polymerized ethylene, called polyethylene
substance formed by the linkage (polymerization) of two or more simple, unsaturated molecules ({see unsaturated hydrocarbon}, called monomers), to form a single heavier molecule having the same elements in the same proportions as the original monomers; i e each monomer retains its structural identity A polymer may be liquid or solid; solid polymers may consist of millions of repeated linked units A polymer made from two or more dissimilar monomers is called a copolymer; a copolymer composed of three different types of monomers is a terpolymer Natural rubber and synthetic rubbers are polymers
(Chemistry) Any of numerous natural and synthetic compounds of usually high molecular weight consisting of up to millions of repeated linked units, each a relatively light and simple molecule (see monomer) Pulsar: A neutron star with a very fast rotational component and strong magnetic field, which constrains emitting radiation to a cone To be visible from Earth, a pulsar must be oriented such that the cone of emitted radiation intersects Earth Quasar: abbreviation of "quasi-stellar object" Quasars are unusually energetic objects which emit up to 1,000 times as much energy as an entire galaxy, but from a volume about the size of our solar system
Any one of two or more substances related to each other by polymerism; specifically, a substance produced from another substance by chemical polymerization
A large molecule built up by the repetition of small, simple chemical units high molecular-weight substance (from 10 000 to >20,000) formed in an association reaction in which many molecules come together to form one large molecule
A naturally occurring or synthetic substance consisting of giant molecules formed from smaller molecules of the same substance and often having a definite arrangement of the components of the giant molecules
[ 'pä-l&-m&r ] (noun.) 1866. International Scientific Vocabulary, back-formation from polymeric, from Greek polymerEs having many parts, from poly- + meros part; more at MERIT.