Chemistry Reference
In-Depth Information
TABLE 7.3
Physic-Mechanical Properties of Some Liquid-Crystal Polyesters of
N
-Oxybenzoic Acid
Property
Xydar
Vectra
S RT-
300
S RT-
350
FSR-
315
A-625
(chem.
stable)
А-515
(highly
fluid)
А-420
(wear
resistant)
А-130(illed
with glass
fiber)
С-130
(highly
thermal
resistant)
Density, g/
cm
3
1.35
1.35
1.4
1.54
1.48
1.88
1.57
1.57
Tensile limit,
MPa
115.8
125.5
81.4
170
180
140
200
165
Modulus in
tension, GPa
9.65
8.27
8.96
10
12
20
17
16
Izod impact,
J/m
of samples
with cut
128.0
208
75
130
370
100
135
120
of samples
without cut
390.0
186
272
—
—
—
—
—
Tensile elon-
gation, %
4.9
4.8
3.3
6.9
4.4
1.3
2.2
1.9
Deforma-
tion heat
resistance (at
1,8 MPa), °С
—
—
—
185
188
225
230
240
Heat resis-
tance on
vetch, °С
366
358
353
—
—
—
—
—
Arc resis-
tance, sec
138
138
—
—
—
—
—
—
Dielectric
constant at
10
6
Hz
3.94
3.94
—
—
—
—
—
—
Dielectric
loss tangent
at 10
6
Hz
0.039
0.039
—
—
—
—
—
—
The description of methods for production of copolymers (having re-
petitive links from derivatives of
n
-oxybenzoic acid, 6-oxy-2-naphthoic
acid, terephthalic acid and aromatic diol) formable from the melt is re-
