Rates of crystallization of copolyamides. II. Random copolymers of nylons 66 and 6

Rates of crystallization of copolyamides of nylons 66 and 6 have been measured by a photometric technique using a hot‐stage microscope. The copolymers all show some crystallinity, but the temperatures of crystallization are reduced as more comonomer is introduced. A close correlation between melting and crystallization behavior is observed. The copolymerized component is acting as a diluent rather than entering the homopolymer crystal.