The 1,3,3-trimethylindolinonaphthospirooxazine(TINS)photochromic material was added during the preparation of polyurethane(PU)elastic fiber,and TINS/PU photo-response elastic fiber was prepared by dry spinning process.The results show that when TINS with a mass fraction of 0.05‰is added,PU elas-tic fiber can show extremely fast photo response discoloration function.With the increase of TINS content,the photochromic time of TINS/PU fiber also increases.The photochromic time of PU elastic fiber with a mass fraction of 0.05‰,0.10‰and 0.20‰TINS is about 3,7 and 9 seconds,respectively,and the mechan-ical properties of the fiber are basically not affected.
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