抄録
Nylon-6 films of various degrees of crystallinity were prepared from the formic acid solution. The film was reacted with 2, 4-dinitrofluorobenzene in the heterogenious state, and the end amino groups were determined spectrophotometorically. The crystallinity was determined by specific gravity. From the results obtained, 5_??_25% of end-amino groups were found to exist in the crystalline region of the polymer.
