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

O
C
O
C
H H
O C C O
H H
n
DMA 3-point bending test, 1Hz, 2K/min
H H
8000
C C
n
H CH 3
PET
PP
6000
n
O
O
O
C
C
C
-R N
N -R
n
C
C
O
O
PI Structural formula PI
N
O
C
C
O
O
C
C
O
N
m
• storage modulus E' [MPa] log
4000
2000
CH 3
0 O
n
–200 -100 0 100 200 300 400 500
CH
• temperature 3 [°C]
TECASINT 1011
PPO TECASINT TECASINT 2011
> PPE? 1011 TECASINT 2011 TECASINT 3011
TECASINT 3011
TECASINT 4011 TECASINT 4111
TECASINT 4011
TECASINT 4111
C H 3
H
C
H
C
TECASINT
H
CH 2
n
CH
CH 3
S
n
PMP
PI (DIN designation)
Polyimides (PI) are produced by polycondensation. They
are non-fusible due to the high amount of ring-shaped,
mostly aromatic chain links and high molecular weights.
The manufacturing of semi-finished products or directforming
parts is therefore done exclusively by sintering
techniques.
The materials belonging to the polyimide group are characterised
by an unusually complex property profile with a
large number of excellent individual characteristics and so
take up a position at the tip of the material pyramid.
Properties
ˌˌNon-melting high-temperature polyimide
ˌˌHigh strength, modulus and rigidity, also in the high
temperature range
ˌˌHigh compressive strength and creep resistance
ˌˌHigh purity, low outgassing in vacuum conditions
ˌˌGood chemical resistance
ˌˌGood thermal and electrical insulation
ˌˌHigh radiation resistance
ˌˌInherently flame resistant
ˌˌHigh density
ˌˌHydrolysis sensitivity to hot water > 100 °C and
superheated steam
PPS
Values
TECASINT TECASINT TECASINT
2011 4011 4111
(PI) (PI) (PI)
T g [°C] 370 260 n.a.
Density [g/cm 3 ] 1.38 1.41 1.46
Modulus of elasticity [MPa] 3,700 4,000 7,000
Service temperature, long-term [°C] 300 300 300
Service temperature, short-term [°C] > 350 > 350 > 400
Lower service temperature [°C] –270 –270 -270
Identifying characteristics
ˌˌLow flammability, does not burn
ˌˌDensity > 1 g/cm³, sinks in water
ˌˌVery hard to tough-soft, depending on type
ˌˌHard / muffled sound on impact
40