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UNITED STATES ATOMIC ENERGY COMMISSION
This document consists of 1 page.
Date Declassified: March 27, 1947
This document is for official use.
Its issuance does not constitute authority
for declassification of classified copies
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and by the same authors)
Technical Information Division, Oak Ridge Directed Operations
Oak Ridge, Tennessee
POLYMERIZED TRIFLUOROCH LOROE THY LENE
A high polymer of trifluorochloroethylene was produced for Manhattan Project uses. This mate-
rial was a chemically inert high temperature thermoplastic which could be pressed into sheets by
flowing out under pressure and otherwise fabricated by conventional methods including continuous
extrusion at from 250" to 300"C. The pressed material was a tough high impact strength solid, elas-
tic under stress, which could be readily machined to small tolerances.
The physical properties of the polymer could be usefully varied by different cooling cycles from
the molding temperature. Slow cooling induced crystallization and the development of a frosty or
milky appearance. Rapid cooling or quenching on the other hand produced transparent sheet material.
The slow cooled material was harder, somewhat more brittle as compared with the quenched mate-
rial, and less easily elongated by stretching.
The general physical properties of the polymer may be summarized as follows. The density
varied from 2.11 for quenched material to 2.13 for a slow cooled sample. The index of refraction was
1.43. The specific resistance at room temperature was determined as 5 x 10" ohms. The ultimate
tensile strength based on final cross section after some elongation varied from about 8 to 10 x 103
psi. The surface hardness varied from about 7 to 12 expressed as Vickers hardness numbers depend-
ing upon the heat treatment.
The polymer was not appreciably swelled by aliphatic hydrocarbon or hydroxyl containing type
solvents at 45C, but absorbed appreciable quantities of low molecular weight chloro and chlorofluoro
solvents. Swelling occurred without solution. The polymer was not wet by water or effected by any
aqueous solution of reagents as, for example, concentrated bases, acids or oxidizing reagents. The
only type reaction observed at below cracking temperatures with the solid polymer was reaction on
heating with active metals such as sodium to produce carbon and metal halide.
The properties of the polymer are such that it can be used as gaskets, valve seats, transparent,
windows, tubing and other apparatus for chemical use, insulators and supports for electrical equip-
ment, etc., where properties of extreme chemical inertness, freedom from moisture uptake combined
with ease of fabrication were desired.
MDDC 818 [1
UNIVERSITY OF FLORIDA
3 1262 08910 9747
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