SynopsisThe residual stress in plasma polymerized films and its annealing effect were measured by employing the Newton ring method. The plasma polymerized films studied were hexamethyldisiloxane (HMDS), norbornadiene (NBD), and acryronitrile (AN) films. The stress in the film is compressive, and this compressive stress changes into tensile stress by annealing treatment. The ESR measurement indicates that the annealing effect on the stress is due to the trapped radical reaction. From the thermal stress measurement, the thermal expansion coefficient and Young's modulus have also been obtained; Young's modulus is in the order of magnitude of lo8 g/cmz with HMDS and NBD films, and the thermal expansion coefficient is in the order of magnitude of deg-l with HMDS and NBD films. These values are much different from those of conventional polymer. This is attributed to the highly crosslinked structure of the films.
Laser recording on novel optical recording media with thermal coloration is reported. The basic recording mechanism is thermally induced chemical reaction between a coloring reagent and a coupling reagent that are deposited in vacuum, separated by a light absorbing layer. Transmittance changes on a 1-μm size recording pit have been observed by writing with a laser diode at 830 nm. This medium is colored blue, red, or black by selecting a coloring reagent layer. It is applied to multicolor recording by accumulating units of media.
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