(SANITIZED)UNCLASSIFIED SUMMARIES OF SCIENTIFIC PAPERS FROM EAST GERMANY AND POLAND(SANITIZED)

• Document Type: CREST
• Collection: General CIA Records
• Document Number (FOIA) /ESDN (CREST): CIA-RDP81-01043R002100130008-2
• Release Decision: RIPPUB
• Original Classification: C
• Document Page Count: 4
• Document Creation Date: December 27, 2016
• Document Release Date: June 27, 2013
• Sequence Number: 8
• Publication Date: March 13, 1958
• Content Type: REPORT

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GDR/Chem.Engng.
July 1957
page 3
Water and solvent resistance of adhesive bonded metal joints
Dr.-Ing.I.Bursztyn.- Long-time tests were conducted at the Polish Plastics
Institute in order to establish the shearing strength under various con-
ditions of joints produced with two epoxyde resins and various other ad-
hesives. The metal used for the test specimens was similar to the English
Alclad. A range of. specimens was immersed into different liquid ageing
media such as distilled and sea water, benzole, ethyl acetate, and other
solvents, and shedr strength values were taken in monthly intervals'up to
a total exposure time of six months. The results are arranged in a table.
It is considered the most interesting result that phenole-formaldehyde
base adhesives show better resistance to most of the liquid media than
the epoxyde resins. This is contradictory to theoretical expectations and
has not yet been explained. 1 table.
(PK 4. no.7. 250-251. July 1957. Warszawa, Poland)
Ccntribution to the "thermal vulcanization" of Buna
H.Luttropp.- liifCerent sorts of Buna may be vulcanized into soft rubber
without the addition of vulcanizing agents and accelerators by a special
thermal treatment. The underlaying effect (thermovulcanization) is studied
for various synthetic caoutchoucs and the properties of the resulting
products are tested in detail. The results show that thermovulcanized pro-
ducts generally possess less tensile strength and swelling resistance than
normal vulcanizates. Elastic properties, wear resistance, and resistance to
surface ageing under statie and dynamic loads, however, is better than with
normal vulcanizates. 3 diagram charts; 2 tables.
(PK 4. no.7. 260-269. July 1957,, Schkopau, GDR)
Patents Suryey
The following patents in the field of plastics and caoutchouc chemistry and
technology originating in the GDR are listed and briefly characterized
under "Patentschau", PK 4, no.7, 275-276:
(a)
Separation of the cellulose esters of fatty acids with 4 or more
carbon atoms from their respective acetylizing solutions.
Solution:: of linear polymers with amide groups present in the
chain structure.
High molecular polyamide xmaignini*timmix compounds.
Device for making joints of conveyor belts, drive
consisting of weldable plastics.
Device for continuous manufacture
Device for the continuous removal
epsilon-amino-caprolactam.
Device for the removal of threaded
injection-molding presses.
Elastic, chemical resistant priming compounds.
Device for the manufacture of porous caoutchouc.
Method for making high-strength plastic shapes out
Joints for profile bodies, particularly tubes.
belts, etc.
of belts from plastic materials.
of monomer components from
plastic
parts from multiple
(PK 4. no.7. 275-276. July 1957. GDR)
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of high polymers.
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GDR/Chem.Engng.
July 1957
page 2
Contribution to the grindability of glass. Part II
J.Gypser.- In continuation of tests described in part I of the treatise
(ST 6, no.91 372-377, September 1955), the influences of different liquid
grinding media on the grindability of plane glass are determined by
measuring the depth to which a grinding wheel works into the specimen
under otherwise equal conditions. It is found that the basicity of water
is not changed appreciably by the glass grindings, and also that basicity
has no influence on the grinding depth. Grinding depth and hence grinding
capacity, however, is considerably increased when hot water is used
as a grinding medium instead of cold water.
Further tests were made in order to illuminate the relationship between
physical properties of glass and optimum grinding speed. The results in-
dicate that the viscosity behaviour of the glass mainly determines the
value of optimum grinding speed whereas other physical properties have
only secondary importance. 3 figures.
(ST 8. no.7. 264-266. July 1957. WeiBwasser,'GDR)
The structure of alumina-chromium sintered bodies
W.Sahatt.- The influence of grinding time, chromium content, and sintering
temperature on the structure of sintered bodies of alumina and chromium
is studied. Specimens sintered under a hydrogen atmosphere and also such ,);=
sintered under a mixed atmosphere of carbon monoxide and nitrogen were
found to contain a constituent possessing a micro hardness considerably
higher than that of the chromium prticles. This constituent is determined
by etching with a solution of potassium ferricyanide. Its distribution
and quantity depend on the sintering atmosphere used. With specimens sin-
tered under hydrogen, the new constituent chiefly occurs at the boundary of
the chromium phase, particularly in case of higher chromium content.
With specimens sintered in the CO-Ni atmosphere, on the other hand, it
shows throughout most of the chromium. Comparative investigations of
sintered chromium bodies permit to infer that the new constituent is a
chromium-chromium oxide mixed crystal. 28 ground sections.
(ST 8. no.7. 268-273. July 1957. Dresden, GDR)
Modern analytical methods for process control in cement works
E.Vogel.- The author described a number of methods for cement analysis
which are mainly based on the use of Complexon III. The described methods
distinguish by that they permit considerably saving of analysis time.
2 figures.
(ST 8. no.7. 287-290. July 1957. Nienburg, GDR)
Dielectric properties of high moleculars and of mixtures thereof as a
function of temperature. Comparision with mechanical measurements.
Dr.H.WOlff.- When the dielectric loss factor of a high-molecular com-
pound is measured as a function of temperatures a marked maximum occurs
at a certain temperature, which is characteristical for the substance
examined. Equal results are obtained it mechanical (torsional) measuring
methods are employed for such investigations. Earlier studies have shown
that mixtures of high-molecular substances compatible with each other
show a single maximum of damping at a temperature depending on the ratio
of the two components in the mixture. Two damping maxima are measured with
mixtures of components that are not compatible with each other.
The author reports on results of further tests in this field, particularly
dealing with the behaviour of the dielectric loss factor in high-molecular
mixtures. 8 figures.
(PK 4. no.7. 244-246. July 1957. "VEB Chemische Werke Buna", GDR)
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Declassified in Part - Sanitized Copy Approved for Release ? 50-Yr 2013/06/27: CIA-RDP81-01043R002100130008-2
GDR/Chem.Engng.
July 1957
rage 1
Digest of GDR's Technical and Scientifical Periodicals
CHEMICAL ENGINEERING
This Digest covers the following periodicals:
Silikat-Technik (ST)
Plaste und Kautschuk (Ph)
,zzz
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