(SANITIZED)UNCLASSIFIED SOVIET PAPER ENTITLED " A STUDY OF THE PROPERTIES OF THE POLYMERS WITH ALTERNATING SILOXANE AND SIL-PHENYLENE LINKAGES"(SANITIZED)

• Document Type: CREST
• Collection: General CIA Records
• Document Number (FOIA) /ESDN (CREST): CIA-RDP80-00247A003600520001-3
• Release Decision: RIPPUB
• Original Classification: C
• Document Page Count: 6
• Document Creation Date: December 27, 2016
• Document Release Date: February 18, 2014
• Sequence Number: 1
• Publication Date: September 23, 1964
• Content Type: REPORT

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50X1 -HUM
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"A Study of the Properties of Polymers with Alternating
Siloxane and Sil-Phenylene Linkages," T.I.Ponomareval
T.A.4.asovskaya and M.V.Sobolevskii, Plasticheskiw Massy,
(No. 6) 21 (1964)
In this contribution there is reported work pertaining to the
investigation of the relationships between bis-(triorganosily10-
benzenes and hexaorganodisiloxanes. In the present work, results
were obtained using mixtures of compounds with recurring
siIylphenylene units in the molecule.
The methods of hydrolytic condensation of condensation of
triorganochlorosilanes with bis-(methylphenylchlorosily1)-
benzenes or with methylphenyldichlorosilane and subsequent
rearrangement to mixed polymers gave the general formula
H3
i;)2X
6"5
where R is phenyldimethyl or methyldiphenyl and X is oxygen
or phenylene.
In Table 1 will be found the general chcracteristics of the
four polymers.
As seen in Table 1, polymers with benzene rings in the chain
have higher temperatures of congealing than do the analogpus
organosiloxanes.
(R3SiO
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Table 1, Characteristics of Organosiloxanes and of
Organophenylenesiloxanes
1. (06H551(01.13)20
H3
1-)20644
6H5
9113
2. (C6H5Si(0H3)2081.-)20
d61'15
9li3411, QH3
3. (CH3Si(C6H6)241tL36-Si-)20
15 d6H5
H3
4. (CH3S1(061%) 0 1-0A.
--)20
6H5 i 6H5
A Congealing Temperature(brittle point ?)
B Viscosity
0 Molecular Weight, Found
D Molecular Weight, Calculated
The viscosity of organophenylenesiloxanes changes more sharply
with respeat to temperature than does that of organosiloxanes.
In the interval between 2500 and 1000 C., the viscosity of
organosiloxanes changes about 4 to 8 fold, the viscosity of
organophenylenesiloxanes 10 to 18 fold (figure 1).
-12.00
25.4cs
835
618
-46.00
6.4cs
777
558
+17.90
92.5cs
1048
1074
-18.00
23.3cs
964
954
Viscosity
cs
Temperature,0
Figure 1
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4.?
Compounds with aromat4 rings in the polymeric chains show less
resistance (stability) to thermooxidation than (do) the
organosiloxanes. With thermooxidation (3000 O., passing air
across the polymer surface) polymers 1 and 3 over 30 hours turn
to a gel, and polymers 2 and 4 remain in the liquid state.
Their viscosities increase, however, from 3.0 to 45 fold
(Table 2).
Table 2
Change in Viscosity of Organophenylenesiloxanes and of
Organosiloxanes during the Process of Thermooxidation at 300? C.
r'Initial
Viscosity
Change in viscosity, with time, hrs., 65
'
1000 0.,cs
10
20
30
50
70
100
1
25.43
41.5
1704
Gel
2
6.4
8.2
10.0
11.8
14.0
20.0
29.1
3
92.5
484.0
1770
Gel
4
23.3
26.8
-
37.8
41.3
58.6
69.0
.. .
At 250? C., during he theriooxidati.ve process tie e1gn iss
organophenylenesiloxanes is slightly higher than (that of)
organosiloxanes. In the case of heating the polymers in an
atmosphere of nitrogen, correlation of weight loss shows the
reverse, from the curve, plotting against time. Polymer 3
has amore strongly polar chcracter
Weight
Loss %
0.8
0.0
0
Time, hours
50
?
Figure 2, Loss of weight at 250?C. when heated in air (----) and
in nitrogen ( solid line), curves for polymers 3 and 4.
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The temperature of decomposition (measured as change in elasticity)
of organophenylenesiloxanes at 1200-1300 C. is higher than for
organopolysiloxanes and measures, for polymers 1 and 3, 4420 and
4430 02, for 2 and 4, 2810 and 316?C.
Specifying apparatus KT-2, lubricating data .on all four polymers
are about identical. For the characterization oforgancephenyiene-
siloxanes there is an absence of extensive data on the coefficient
of friction. The value for this coefficient is 0.2 or 0.28 for
the temperature interval 1000-3000 O. For organosiloxanes the
coefficient of friction is 0.19 to 0.4. The diameter loss for all
four polymers is 0.15 to 0,16 mm in the interval 1000-3000 C.
Summary
1. The introduction of the benzene ring into a molecule of
methylphenyisiloxane increases the viscosity, the temperature
coefficient of viscosity and heightens the temperature,of setting.
2. Replacement of oxygen between'siliconsLbg the benzene ring lowers
the thermooxidative resistance of the methylphenyisiloxane but
improves the thermal resistance.
3. Organophenylenesiloxanes have a temperature of decomposition
of 1200-1600 above that of,organosiloxanes.
4. The intrOduction of the benzene ring into the molecule of a
methylphenylsionane practically speaking, has no effect on the
lubricating properties.
Literature
T.I.Ponomareva, T.A.Krasovskaya and M.V.3obolevskii,
Pl9sticheskie Massy, (No. 7) 22 (1963)
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