Polyacrylonitrile (PAN)

Polyacrylonitrile (PAN) EB plastic (CH 2 = CHCN), a compound that reacts with propylene with ammonia

(NH 3) and oxygen in the presence of catalyst, to polyacrylonitrile via suspension methods using free radical polymerization initiator.

Most production polymers are used in acrylic fibers, which are used as fibers containing 85% or more of PAN.

Because PAN is difficult to dissolve in organic solvents and is highly resistant to dyeing, little fiber containing PAN is produced alone.

On the other hand, a copolymer containing PAN and 2 to 7% vinyl composite

Such as vinyl acetate can be easily penetrated by fibers that are soft enough

They give dyes, they resin. Acrylic fibers are soft and flexible and produce light and high yarns.

Polyacrylonitrile PAN

These properties are very similar to the properties of polyacrylonitrile (PAN) wool.

And hence the most common use of acrylic in clothing and carpets as a substitute for wool – for example in knitwear such as sweaters and socks.

Acrylics can be sold at a fraction of the cost of natural fibers and are light resistant, durable

They have mold and are resistant to attack by butterflies.

Acrylic fibers are also used as a pre-production for carbon and graphite fibers, as an alternative to asbestos in cement and filters.

Industrial and used battery separators.

Modified acrylics by halogen-containing commons such as vinyl chloride or vinylidene chloride are classified as modacrylics.

(By definition, madacrylics have more than 35% and less than 85% PAN.)

Chlorine gives fibers significant flame resistance – an advantage that makes macric materials suitable for products such as

Children’s pajamas, blankets, awnings and tents are desirable.

However, due to the higher cost as well as to some extent the sensitivity to heat (e.g., from ironing)

They are not as useful as plain acrylics.

Polymethyl methacrylate(PMMA)

Methyl methacrylate is bulk or polymer suspended using free radical scavengers.

The presence of methyl pendant (CH 3) groups prevents the polymer chains from being closely packed

In crystalline mode and from rotating freely around carbon-carbon bonds

As a result, PMMA is a clear and hard plastic.

PMMA is an ideal alternative to glass because it retains these properties over years of exposure to ultraviolet light and weather.

A successful app that lights up inside signs and is available for promotions and tips.

PMMA is also used in domed skylights, swimming pool areas, aircraft canopies, dashboards and glazed roofs.

For these applications, plastics are sold as sheets that are machined or thermoformed, but also

They make lighting by injecting in headlights, taillights, and lighting fixtures.

HEMAand cyanoacrylate polymers

Monomers are structurally related to methyl methacrylate and hydroxyethyl methacrylate and methyl cyanoacrylate, which are characterized by chemical formulas.

Respectively. The polymers of the former composition, commonly referred to as HEMA, soften by absorbing water.

Polymers are used to make soft contact lenses.

The latter compound, commonly called cyanoacrylate, is unusual in that it exposes the polymer atmosphere to moisture and forms a strong adhesive.

As a result, cyanoacrylates are marketed as contact adhesives under brands such as Super Glue.

Because they are so sticky to the skin, they are widely used by surgeons (to close incisions) and by doctors (to seal eyes and lips).

Polymethyl acrylate and polyethylene acrylate

These materials are acrylic polymer (CH are 2 = CHCO 2 R), which has the following unit structure:
R may be a methyl (CH 3) or ethyl (CH 2 CH 3) group or other carbon chain.

These polymers are generally prepared in solution and emulsion polymerization methods using free radical primers.

They are used as fiber modifiers and in adhesives and surface coatings.

Acrylic polymer polymers are components of acrylic paint films.

Polyacrylate lastomers

Acrylic esters, which are polymerized in small amounts (approximately 5%) of other halogen-containing monomers

They can form polymer chains that bond together in halogen locations.

These so-called polyacrylate elastomers have good heat resistance (about the size of silicone rubbers and fluorostomers) and show resistance to swelling by hydrocarbon oils. They are mainly used for O-rings, seals and washers.

Fluorinated polymers

Polytetrafluoroethylene (PTFE)

PTFE was discovered in 1938 by a DuPont chemist on plankton as a reservoir of tetrafluorotin gas (CF 2 = CF 2) to a white polymerization powder.

During World War II it was used as a corrosion-resistant coating to protect metal equipment used in the production of radioactive materials.

In 1960, DuPont introduced the Teflon-coated non-stick cookware under its own brand.

Using high pressure suspension or soluble methods in the presence of free radical initiators, we make a gas tetrafluoroethylene monomer.

This polymer is similar in structure to polyethylene, which consists of a carbon chain with two fluorine atoms attached to each carbon.

Fluorine atoms, like pods, surround the carbon chain and form an inert, relatively dense chemical product with

Carbon and fluorine bonds are very strong.