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SYNOPSISThe structure of oriented transfer films of poly (tetrafluoroethylene) (PTFE), previously used as orientation-inducing layers for a variety of materials, was studied. Transmission electron microscopy and X-ray diffractometry were employed to determine the continuity and relative volume of the PTFE films, which were deposited onto glass substrates by friction transfer at controlled temperatures, pressures, and sliding rates. The thickness and continuity of the films were found to increase with increasing temperature and applied pressure. In the range of sliding rates used (0.1-10 mm/s) , no significant correlation between this processing variable and the thickness or continuity was apparent. Transmission electron microscope investigations showed that, generally, the ( 100) plane of the PTFE crystalline unit cell was parallel to the glass surface. 0

Notes 2103 perchloric acid4 and 0.5 g. of 5% palladium-on-charcoal (Wilkens-Anderson Co.). The still warm solution was shaken with hydrogen at 30-35 lb. pressure until 0.2 mole had been absorbed, about one hour. After removal of the catalyst the solution was heated to 75°and diluted with water until cloudy. Upon seeding and cooling, finally to 15°, the acid generally precipitated as an oil which later solidified. After drying in vacuo over solid sodium hydroxide the granular product weighed 20 g. It was dissolved in 130 ml. of petroleum ether (b. p. 60-70°) and treated with Norit to yield 19.8 g. (82.5%) of white needles, m. p. 74.5-75°( reported3, 75°).Four additional reductions were run as above and the reaction mixtures were combined and worked up to give the acid in 89% yield.(4) The efficacy of perchloric acid in promoting hydrogenolysis was first recognized by Karg and Marcus, Ber., 75, 1850 (1942).

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Orientation and nonlinear optical properties of 4-(N,N-dimethylamino)-3-acetamidonitrobenzene crystals on nanostructured poly(tetrafluoroethylene) substrates