Monomers


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Monomers

 

low-molecular-weight substances composed of molecules that interact with one another (polymerization or polycondensation) or with the molecules of other substances to form a polymer. Most of the monomers that take part in polymerization processes belong to one of two classes: (1) compounds that undergo polymerization because of the scission of multiple bonds—for example, C=C, O≡C, C=O, and C≡N (olefins, diene and acetylene hydrocarbons, aldehydes, and nitriles); and (2) compounds that polymerize because of scission of ring groups (for example, olefinic oxides, lactames, and lactones).

The monomers that take part in polycondensation reactions may be any compounds that contain no fewer than two reactive (functional) groups per molecule—for example, diamines, dicarboxylic acids, amino acids, and glycols. During polycondensation, bifunctional compounds form linear polymers, whereas compounds with more than two functions produce branched and reticular polymers.

References in periodicals archive ?
New product development are the key strategies followed by major industry players for growth of dye stuff market for instance, Evonik Industries on On March 1, 2014, presented its new line of Visiomer Terra products at the American Coatings Show in Atlanta, Georgia, the acrylic monomers business line began pushing methacrylate monomers based to important degree on renewable resources under the product family Visiomer Terra.
Styrene is an unsaturated aromatic monomer compound commonly used in industrial polymer industries such as polystyrene latex and plastic making.
According to the ISO 20795-1:2008 standard, the maximum acceptable quantity of residual monomers in acrylic should not be more than 2.2% by weight.19,20
With the construction of the new plant for specialty monomers, the Munich-based chemical Group is creating the necessary capacity to independently secure the supply of key raw materials for the manufacture of the powders at its Burghausen site over the long term.
The monomers BA and MMA were purified by reduced pressure distillation (<300 Pa and 100[degrees]C) to remove the inhibitors.
Judges rejected a key argument of the group that monomers effectively ceased to exist when they became part of a stable polymer, and so it was a waste of time and money to register these inputs.
It is synthesized from the disaccharide sucrose, and consists of fructose linked by [beta](2-->1) bonds that terminate with a glucose monomer. But the chain lengths are short, about 2 monomers to 5 monomers.
Langhals and his colleagues decided to use hydroxyethyl methacrylate--an organic monomer used to make many plastics.
It consists of a 120-ft-tall continuous loop of gas divided into two zones by a liquid monomer barrier that is held in place by tightly packed polymer particles.
The Global Acrylic Monomers Market is expected to reach USD 11,124 million by 2025, from USD 7,012 million in 2017 growing at a CAGR of 5.7% during the forecast period to 2025.
In the price sensitive global acrylate monomers market , savvy players are partnering with OEM manufacturers, designers, and merchandisers to develop cost effective acrylic products with inexpensive formulations.
It was concluded that students dispensing acrylic powder and liquid monomer without calculations would lead to higher residual monomers if a proper curing regime is not followed.