Polyamide (PA) an fi sani da nailan, kuma dogon nailan sarkar carbon yana nufin nau'in nailan tare da ƙungiyoyin methylene guda 10 ko fiye tsakanin amintattun haɗin gwiwa a cikin babban sarkar macromolecule, kamar PA11, PA12, PA1010, PA1212, PA1012, da sauransu. Daga cikin su, PA610 da P...
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