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- W2028962854 abstract "The principle of the fluorescence method for the estimation of molecular orientation in the fiber is described with special consideration on the relative position of the optical systems and on some optical effects such as birefringence. The type of molecular orientation in the fiber is regarded as the superposition of two typical types of orientation; one is random orientation and the other is conical orientation, the latter including linear orientation and planar orientation as the extreme cases. Parallel component of fluorescence intensity is calculated for the above two types of orientation.Then the apparatus specially devised for the simultaneous measurement of stress and fluorescence of the fiber is illustrated. The correction factor for the unavoidable optical inadequacies is obtained experimentally.Several examples of the measurement of molecular orientation in fibers and films are cited. Polyethylene film drawn 500%. shows almost the perfect linear orientation. Cotton fiber shows conical orientation whose vertical angle is about 40°. Polyacrylonitrile fiber drawn 1100%. shows approximately linear orientation, but the planar orientation perpendicular to the fiber axis is seen after the fiber is exposed to heat treatment." @default.
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- W2028962854 date "1969-01-01" @default.
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- W2028962854 title "PRINCIPLE AND APPARATUS FOR THE ESTIMATION OF MOLECULAR ORIENTATION IN THE FIBER" @default.
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- W2028962854 doi "https://doi.org/10.2115/fiber.25.16" @default.
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