Polyacrylate

polyacrylate

[¦päl·ē′ak·rə‚lāt]
(organic chemistry)
A polymer of an ester or salt of acrylic acid.

Polyacrylate

 

a polymer of esters of acrylic acid or methacrylic acid, with the general formula

where R′ = H or CH3 (for acrylic and methacrylic acids, respectively) and R is an aliphatic, carbocyclic, or heterocyclic group.

Polyacrylates containing the R groups methyl (— CH3), ethyl (—C2 H5), n-butyl (—C4 H9) and cyclohexyl (—CeH11) are of the greatest industrial importance. These polyacrylates are transparent thermoplastic polymers that are physiologically harmless and readily soluble in organic solvents and are characterized by low resistance to oil and gasoline.

Polyacrylates are produced by polymerization of esters of acrylic and methacrylic acids (acrylates and methacrylates, respectively). Polymerization of a mixture of acrylates whose chemical structure differs in the nature of the R group yields high-strength multipurpose materials.

Polyacrylates are used in the production of organic glass (mainly polymethyl methacrylate), films, paints and varnishes, adhesives, and impregnation compositions for paper, leather, wood, and fabrics. Polyacrylates are widely used in medicine, especially in dentistry, for the preparation of artificial jaws and teeth and for fillings. Acrylate polymers and copolymers are used to make prostheses and contact lenses, as well as special castings for preserving various items. Acrylates are widely used as como-nomers to increase the plasticity of rigid polymers and to produce acrylic rubbers.

REFERENCES

See References under POLYMER.

V. P. SHIBAEV

References in periodicals archive ?
Tenders invited for Supply of polyacrylate as per enclosed specifications.
1st generation Leveling Linear chain standard polyacrylate 2nd generation Anti-crater effect Linear main chain silicone or without influence on and long silicone polyether-macromer surface energy macromer modified High surface energy Branched main and improved leveling chain with polyether macromer 3rd generation High surface energy Linear main chain silicone and and improved and short silicone polyether-macromer leveling, slight macromer modified anti-crater effect Linear main chain and medium silicone macromer Branched main chain and medium silicone macromer 1st generation Structure 1 standard polyacrylate 2nd generation Structure 2 silicone or polyether-macromer modified Structure 3 3rd generation Structure 4 silicone and polyether-macromer modified Structure 5 Structure 6 Figure 3.
At ETAD, Dr Helmes led the Environmental Protection Agency and other organisations, worked on the well-known High Production Volume (HPV) challenge management of SOCMA's Association Management Services as well as lead the Center for Baby and Adult Hygiene Products (BAHP) and Institute for Polyacrylate Absorbents (IPA).
The company helps customers choose from its extensive formulation library which currently includes perfluoroelastomer (FFKM), fluoroelastomer (FKM), polyacrylate (ACM), Vamac (AEM), hydrogenated nitrile (HNBR), carboxylated nitrile (XNBR), nitrile (NBR), ethylene propylene (EPDM), epichlorohydrin (ECO), natural rubber, polyisoprene rubber (IR), styrene butadiene (SBR) and polychloroprene (CR).
For example, a diaper contains the super-absorbent polymer sodium polyacrylate, biodegradable and compostable packing materials are made of starch while FriXion pens exhibit the thermochromic 'magic' of disappearing ink.
A hardening agent like sodium polyacrylate can be added to solidify the dispersion for safe and convenient disposal.
Sodium polyacrylate co-polymers Account for Highest Demand
The waterborne polyacrylate prepared via conventional emulsion polymerization exhibits the disadvantages of its linear structure.
Nano-hydroxyapatite powders were synthesized by co-precipitation method, using Ca[(N[O.sub.3]).sub.2] x 4[H.sub.2]O and [(N[H.sub.4]).sub.2]HP[O.sub.4] as reagents and polyacrylate sodium as a template.
The chemical treatments used in experiments were (a) gum arabic, (b) propanol, (c) ethanol, (d) sodium polyacrylate, (e) methylcellulose, (f) sodium dodecyl sulfate, and (g) silane.
Bayer MaterialScience has developed a new polyacrylate binder for use in formulating topcoats with a very low concentration of volatile organic compounds (VOC).
Other areas explored include cohesive mixing, preparation of a cationic polyacrylate emulsion paper-strengthening agent, intelligent drilling tools, a new portable toilet design, and sensing properties of carbon-coated filaments.