Acrylates Group
Thermoplastics > Acrylates
Group acrylates | ||||||||
Acrylates are a family of polymers, which are a type of vinyl polymer. Acrylates, of course, they are made of acrylate monomers. Acrylate monomers are generally esters containing vinyl groups, that is, two carbon atoms joined by double bonds bonded directly to the carbonyl carbon of the ester group. Some polymers (especially copolymers) containing the free acid and acrylic acid. | ||||||||
Acrylate polymers | ||||||||
It is very important difference between the two carbons vinyl (alpha carbons and beta ester or acid group. The alpha carbon is more electron poor that the beta carbon due to the very natural nature of carbonyl, moving the electron density vinyl group usually electron rich. This has a great effect on the monomer, something that is not space to enter. However, one thing means that the anionic polymerization is made possible for different forms (and methacrylates), and this provides polymers with different backbone tactics and different physical properties, as being more crystalline. | ||||||||
Acrylate polymers | ||||||||
Acrylate polymers are a group of polymers known for their transparency, breaking strength and elasticity. Commonly also they are known as acrylic or polyacrylates. The acrylate monomers used to form acrylate polymers based on acrylic acid structure, consisting of a vinyl group and an end carboxylic acid ester or a nitrile. | ||||||||
Acrylate elastomers | ||||||||
In this family there is also the group of acrylic elastomers are several kinds of synthetic rubber whose main component is the acrylic acid alkyl ester (ethyl or butyl ester). Acrylic elastomer has characteristics of heat resistance and oil. It is divided into three types; ACM (copolymer of acrylic acid ester and 2-chloroethyl vinyl ether) containing chlorine and ANM (copolymer of acrylic acid ester and acrylonitrile) without chloride. Apart from resistance slightly better ANM water, no physical differences; even the processability is poor for both. Since prices are also high, demand is not as high in relation to the characteristics. Furthermore, the new type of acrylic rubber containing no chlorine despite its unclear chemical composition. AEM, andl ethylene / acrylic elastomer is a copolymer of ethylene and methyl acrylate plus a small amount of a monomer containing carboxylic acid curesita groups. AEM is a tough rubber, low compression, with excellent resistance to high temperatures, hot mineral oil, fluids and weathering. | ||||||||
Polymers and elastomers in the g roup acrylic | ||||||||
Another aspect of the transparency of acrylic is its duration. In general, the polymers tend to yellow by the action of ultraviolet radiation, so in most cases it is necessary to add UV absorbers to prevent degradation easily visible. From this viewpoint, the acrylic polymers are particularly privileged, since they have a natural resistance to radiation and generally to all types of aging. | ||||||||