PEEK

PEEK - Names and Identifiers

Name	PEEK
Synonyms	PEEK polyetheretherkrtone POLY ETHER ETHER KETONE Polyetheretherketone(peek) 4,4'-Difluorobenzophenone,hydroquinonepolymer Methanone,bis(4-fluorophenyl)-,polymerwith1,4-benzenediol Poly(oxy-1,4-phenyleneoxy-1,4-phenylenecarbonyl-1,4-phenylene) average Mw ~20,800, average Mn ~10,300
CAS	29658-26-2

PEEK - Physico-chemical Properties

Molecular Formula	C19H14F2O3
Molar Mass	328.31
Density	1.3 g/mL at 25 °C(lit.)
Melting Point	322°C
Water Solubility	all common solvents: insoluble
Physical and Chemical Properties	The electrical insulation performance of polyether ether ketone is very excellent, and the volume resistivity is about 1015~1016 Ω · cm. It still has a small dielectric constant and dielectric loss in the high frequency range. For example, at 104Hz, its dielectric constant is only 3.2 and its dielectric loss is only 0.02.
Use	New engineering plastics, excellent heat resistance, used in the manufacture of wire and cable insulation materials, aircraft structural materials, aircraft parts and so on

PEEK - Risk and Safety

WGK Germany

PEEK - Introduction

product features

Polyether ether ketone has the heat resistance, chemical stability and molding processability of thermosetting plastics. Polyether ether ketone also has excellent heat resistance. The thermal deformation temperature is 160 ℃. When reinforced with 20% ~ 30% glass fiber, the thermal deformation temperature can be increased to 280~300 ℃. Polyether ether ketone has good thermal stability and is 420 ℃ in air. Weightlessness was only 2% at 2h, 2.5% at 500 ℃ and significant thermal weightlessness was generated at 500 ℃. The long-term use temperature of polyether ether ketone is about 200 ℃. At this temperature, it can still maintain high tensile strength and bending modulus. It is also a very strong material with excellent long-term creep resistance and fatigue resistance.

physical and chemical properties

the electrical insulation performance of polyether ether ketone is very excellent, and the volume resistivity is about 1015~1016 Ω · cm. It still has a small dielectric constant and dielectric loss in the high frequency range. For example, at 104Hz, its dielectric constant is only 3.2 and its dielectric loss is only 0.02.

The chemical stability of polyether ether ketone is also very good. Except for concentrated sulfuric acid, it is very stable to almost any chemical reagent, and it can still maintain good chemical stability even at higher temperatures. In addition, it also has excellent heat-resistant water and steam resistance. It can be used for a long time in steam at 200~250 ℃.

polyetheretherketone has good flame retardancy and is difficult to burn under normal environment. even if it is burned, the amount of smoke and harmful gas release are also very low, even lower than polytetrafluoroethylene and other low-smoking polymers. In addition. It also has excellent radiation resistance. Its resistance to alpha rays, beta rays, & gamma; rays is the best among polymer materials at present. The wire products covered with it can withstand 1.1 × 107Gy & gamma; rays.

Polyether ether ketone has good melting fluidity and thermal stability above the melting point. Therefore, it has the typical molding processing performance of thermoplastics, so it can be used in injection molding, extrusion, blow molding, lamination and other molding methods, as well as spinning and film making. Although the melting processing temperature range of polyether ether ketone is 360~400 ℃, its thermal decomposition temperature is above 520 ℃, so it still has a wide processing temperature range.

Thermoplastic material with the highest performance

In 1977, the British ICI company successfully developed polyether ether ketone and began its commercialization path. Polyether ether ketone (PEEK) is recognized as one of the highest performance thermoplastic materials in the world. Together with polyphenylene sulfide (PPS), polysulfone (PSF), polyimide (PI) and polyarylate (PAR), PEEK has become five special engineering plastics. |

● high temperature resistant PEEK has higher glass transition temperature (Tg = 143 ℃) and melting point (Tm = 334 ℃), load thermal deformation temperature is as high as 316 ℃, and instantaneous service temperature can reach 300 ℃.

●Self-lubricating PEEK has good sliding characteristics and is suitable for occasions where low friction coefficient and wear resistance are strictly required.

●Corrosion resistance Except for concentrated sulfuric acid, PEEK is insoluble in any solvent and has high chemical stability.

● Flame retardant PEEK is self-extinguishing.

● Easy processability Because PEEK has the advantages of good high temperature fluidity and high thermal decomposition temperature, a variety of processing methods can be used, such as injection molding, extrusion molding, compression molding, etc.

●Mechanical properties PEEK has good toughness and rigidity, and has excellent fatigue resistance comparable to alloy materials.

● Hydrolysis resistance can be used continuously under high temperature and high pressure steam or water environment to maintain good mechanical properties.

●Excellent weather resistance and weather resistance. Polymers can be used to manufacture components that require strict working environments or require frequent sterilization treatment.

Application fields of polyether ether ketone (PEEK)

The long-term use temperature of polyether ether ketone is as high as 250 ℃, so it was once called super heat-resistant special engineering plastic. In addition, it also has high strength, corrosion resistance, radiation resistance, excellent electrical properties, flame retardant, suitable for various processing techniques and other excellent comprehensive properties. Therefore, PEEK has been widely used in high-tech fields such as national defense and military industry, aerospace, electronic information, energy, automobiles, home appliances, medical and health.

PEEK resin was first successfully developed and commercialized by British ICI company in the early 1980 s. after a period of development induction, it was independently operated by Victrex company in 1993, and the output increased at an annual rate of 15%. By the end of the 20th century, PEEK resin was still exclusively produced and supplied by Victrex companies. Its production scale has reached 2,000 t per year. The main consumer markets are: Europe and the United States each account for 45%, and Asia, mainly Japan, accounts for 10%.

Main application areas of PEEK

from the distribution of application fields, the automobile and other (including aviation) transportation market accounts for about 40% of PEEK resin consumption, semiconductor manufacturing equipment accounts for 25%, compressor valve plates and other general mechanical parts products account for 25%, medical devices and analytical instruments and other markets account for 10%.

1. In the field of transportation machinery such as automobiles

In recent years, the growth of PEEK resin in the European market is especially the fastest growth in the auto parts products market, especially the parts around the engine, variable speed transmission parts, steering parts, etc. have chosen PEEK plastic instead of some traditional high-priced metals as manufacturing materials. In the future, as the automotive industry adapts to the requirements of miniaturization, lightweight and cost reduction, the demand for PEEK resin will continue to grow. Some data show that 44 parts of a European model use PEEK plastic instead of traditional metal products.

2, IT manufacturing field

Semiconductor manufacturing and the electronic and electrical industry are expected to become another growth point for PEEK resin applications. In the semiconductor industry, in order to achieve high functionality and low cost, silicon wafers are required to be larger in size and more advanced in manufacturing technology. Low dust, low gas release, low ion dissolution and low water absorption are the special requirements for various equipment materials in the semiconductor manufacturing process. This will be the place where PEEK resin will show its talents.

3. Office machinery parts field

For the separating claws, special heat-resistant bearings, chains, gears, etc. of the copier, when PEEK resin is used instead of metal as their material, the components can be lightweight, fatigue-resistant, and oil-free lubrication can be achieved.

4. Wire coating field

PEEK coating has good flame retardancy. Without any flame retardant, its flame retardant grade can reach UL94 V-0 grade. PEEK resin also has the advantages of peeling resistance and radiation resistance (109 radon), so special wires used in military industry, nuclear energy and other related fields have been widely used to make coatings. Due to these unique properties of PEEK resin, it is expected to replace some general purpose fluororesins in the future.

5, plate, bar and other fields

PEEK is often encountered in the application process of some special fields with a small number and a large number of varieties. at this time, it is very beneficial to use rods, plates and other profiles for mechanical processing and manufacturing.

6. fiber field

PEEK fiber (including monofilament) has been widely used in composite materials, industrial filter cloth, industrial brushes and other products. In the field of composite materials, the charm of PEEK fiber lies in its thermoplastic and high temperature resistance. In addition to heat resistance in industrial filter cloth and industrial brushes, its charm lies in its chemical resistance and abrasion resistance.

7. medical analysis device field

Because PEEK can withstand repeated autoclaving, it can be used in medical devices to manufacture endoscopic parts, dental detergents, etc. In addition, due to the high strength and low dissolution of PEEK, it has been used in liquid chromatography columns, tubes, accessories, etc. for instrumental analysis. Moreover, due to the good compatibility between PEEK and human body, it has successfully replaced the traditional titanium metal as an artificial bone material in recent years.

Preparation

There are two types of process routes for the synthesis of polyether ether ketone trees.

The first category is the polycondensation reaction of difluorobenzophenone and hydroquinone in the presence of anhydrous sodium carbonate, using diphenylalum as a solvent, that is, an aprotic polar solvent, to obtain high molecular weight Polyether ether ketone has the advantage that the side reactions such as branching and crosslinking of the polymer are easier to control, but the reaction conditions are harsh, the synthesis process is complicated, the monomer is expensive, this is also a major reason why the price is expensive and restricts its application.

The second type of process is made by low-temperature reaction using diphenyl ether and isophthalyl chloride as raw materials. Its advantages are mild conditions and convenient source of raw materials, but there are side reactions such as polymer branching and crosslinking. Therefore, for the synthesis of electrophilic routes, how to effectively control the side reactions such as polymer chain branching and crosslinking to obtain high molecular weight polymers, the selection of reaction solvents is particularly important.

Use

New engineering plastics with excellent heat resistance, used to manufacture wires, cable insulation materials, aircraft structural materials, aircraft parts, etc.

Last Update：2023-08-16 22:24:45