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Abstract 1) The photochemical degradation of 6 nylon was investigated through the measurement of intrinsic viscosity and the amount of water-soluble material of 6 nylon taffeta irradiated for various periods of time in Fade-Ometer. 2) The intrinsic viscosity or the number-average degree of polymerization decreases rapidly at the initial stage, while the amount of water-soluble material increases approximately in proportion to the exposure time. 3) It is deduced from the relationship between the number-average degree of polymerization and the amount of water-soluble material that the molecular chain of 6 nylon is randomly split off by light. The relationship is well explained by the theory of random breaking of the polymer chain.
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Takeshi Hashimoto (1957) studied this question.
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