FIELD: production of fibers. SUBSTANCE: method involves grafting nitrobenzyl, allyl or nitrostilbene groups to fibers comprising 20-400% of water, said groups substitute hydrogen on amine portions of polyparaphenylene terephthalamide by 0.25-75%. Fiber-reinforced rubber composition comprises rubber matrix material and 0.5-15wt% of said fibers. EFFECT: increased quality of rubber composition by improved adhesion of matrix with fiber. 8 cl, 1 tbl, 3 ex
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