Engineering plastics – The Manual - F.wood-supply.dk

PEI
PI
O O C
O
n
160
O
C
O
C
H H
O C C O
H H
n
Structural PEEK formula PEEK
120
PET
H
H
O
O
C
n
80
C H 3
C C
n
CH 2 H
CH
CH 3
PEK
Structural O formula PEK
CH 3
C
O
C
O
N
O
O CH O 3
C
O C
O C C
n
O
PEKEKK PEI Structural formula PEKEKK
TECAPEEK
O
O
S
O n
O
C
O
n
CH 2
CH 2
N
• Stress [MPa]
40
PMP
TECAPEEK TECAPEEK
POM-C PI ST black TECAPEEK TECAPEEK HT black
H H
C C
n
H
CH 2 H
C O
n
CH
H 3 CH
CH 3
O
O
O
O
C
C
C
C
-R H
N H H
N -R N
n
n
0
C OC
C C O
0 5 l
10m
n
15
C
20
C
• Strain [%] H O H H
O
O
TECAPEEK ST sw
TECAPEEK HT sw
O
C
C
O
N
m
n
PES PEK
PAEK (DIN designation)
The group of polyaryletherketones (PAEK) encompasses in
the main PEEK, PEK, PEKEKK and PEKK.
The molecular structure of the members of this polymer
group differs in terms of the respective number of cohesive
ether and ketone groups. Consequently, with an increasing
number O of Oketone H groups, H underlying distinctions occur
with C rising Cglass O transition C C O
n
and melting temperatures. Processability
by melting becomes increasingly difficult, and is
H H
then replaced by pressing methods, which are the preferred
PET
option for large-scale semi-finished product dimensions.
A typical characteristic of this group of materials, which is
classified as part of the thermoplastic high-temperature
plastic group, is that its property profile is largely maintained
Oalso in high-temperature
O
O
ranges above O 100 °C; Most
O
characteristic C values C change only C moderately. CThe most important
N material and the one with N the -R most N technical uses
C
-R
n
is the polyetheretherketone C
PEEK. C
C
C
The materials O belonging to the O polyaryletherketone O group O
are characterized by an unusually complex property profile
PI
with a large number of excellent individual characteristics.
Properties
ˌˌSemi-crystalline
ˌˌLow density
H H
ˌˌHigh degree of toughness
ˌˌHigh strength, hardness and rigidity
ˌˌLow tendency to creep
C H 3
PMP
C C
n
CH 2 H
CH
CH 3
N
POM-H PMP
ˌˌGood sliding friction properties,
good abrasion resistance
ˌˌVery good chemical resistance to
a wide range of technical media
ˌˌHydrolysis resistance,
tendency to stress crack formation
ˌˌHigh thermal H H stability
C C
ˌˌUnusually high n radiation resistance
H CH
to gamma and 3
X-rays
ˌˌVery low moisture absorption
PP
ˌˌMinimal thermal expansion
ˌˌGood dimensional stability
ˌˌInherently flame resistant, self-extinguishing
ˌˌMinimal ion contamination
ˌˌVery low outgassing rates in high vacuum
ˌˌMinimal, low-toxicity gas development
CH 3
in case of fire
m
CH
Values
3
TECAPEEK TECAPEEK HT TECAPEEK ST
PPO > PPE? (PEEK) (PEK) (PEKEKK)
T g 150 °C 160 °C 165 °C
PPS
S
O
n
n
Density 1.31 g/cm³ 1.31 g/cm³ 1.32 g/cm³
Modulus of elasticity 4,200 MPa 4,600 MPa 4,600 MPa
Service temperature, long-term 260 °C 260 °C 260 °C
Service temperature, short-term 300 °C 300 °C 300 °C
Lower service temperature –40 °C –40 °C –40 °C
(Exceptions down to –100 °C,
increasing brittleness)
36