Abstract
Melting point depression by methoxymethylation was studied for nylon 6. In the previous paper3), it was pointed out that the melting of nylon 6 fibers methoxymethylated to different extents behaves like that of non-isomorphic random polycaproamide copolymers. The melting behaviors of highly amorphous nylon 6 methoxymethylated to different extents were investigated here by using the DSC measurements. The obtained relation between the melting temperature and the mole fraction, 1-XA, of the methoxymethylated units in the range of 1-XA<0.15 satisfies the modified Flory's equation proposed by the authors. At 1-XA≈0.25, a transition of methoxymethylated nylon 6 from partially crystalline to perfect amorphous state was observed from the DSC curves. This result is also supported theoretically.
