Table 11 Properties of organoplastics reinforced by para-aramide (Rusar-С)
and polysulfonamide (Tanlon) fibers (fiber length is 10 mm)
Fiber
C,
mass.%
Impact
toughness, kJ/m
2
Martens heat
resistance, К
Water
absorption, %
Coefficient of
anisotropy of properties
Rusar-С
50
99
444
0.15
1.02
60
100
466
0.16
1.13
70
99
462
0.18
1.27
Tanlon
60
35
461
0.16
-
70
30
456
0.21
-
Source: developed by the author
The low anisotropy coefficient of the properties (1,13) of the material also
indicates high isotropy and uniformity of OP. The study of the effect of the degree of
filling of fiber showed that OP containing 60 mass.% of both types of filler has the
optimal complex of physico-mechanical properties. OP reinforced by Rusar-C fiber,
which is the undisputed leader in strength and other physico-mechanical characteristics
among aramid fibers, are characterized by the highest strength properties. With equal
weight, Rusar-C is five times stronger than steel [8].
The study of physico-mechanical characteristics of OP (tab. 12) showed that the
maximum indicators are observed in OP containing 60 mass.% of Rusar-С fiber. With
the
implementation of the same amount of polysulfonamide fiber, the strength is
significantly lower. It is explained by the lower strength of the Tanlon fiber compared
to the Rusar (see tab. 5). Strength continues to decrease with a further increase in the
content of this fiber to 70 mass.%.
Table 12 Physicomechanical characteristics of organoplastics
Organoplastic
Elastic
modulus,
MPa
Сompressive
stress, MPa
Relative
deformation,
%
Microhardness,
MPa
LBS-1 + 60 mass.% of fiber Tanlon
2152
82
4,9
317
LBS-1 + 70 mass.% of fiber Tanlon
1419
49
4,5
291
LBS-1 + 60 mass.% of fiber Rusar-С
2820
104
4,6
200
Source: developed by the author
The confirmation of the foregoing is the fact that the experimental density of OP
containing 70 mass.% of Tanlon fiber is less than the calculated one (Fig. 6, 2): the
packing of macromolecules in the surface layer becomes looser due to the difficulty of
relaxation processes during the formation of organoplastic. Compression curves of
developed organoplastics (Fig. 7) relate to the type II curves according to the Herzberg
classification. They characterize elastic homogeneous-plastic behavior: in addition to
the straight section, which corresponds to the elastic deformation of the samples, there
is a weakly expressed parabolic section that describes the homogeneous-plastic
deformation, which leads to irreversible changes of the shape, on the curves (Fig. 8).
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