Abstract
An attempt was made to inves tigate the change in supermblecular structre of nylon 66 fiber with elapse time. A nylon 66 fiber was kept in the room controlled isothermally or in the room without the control under free of tension for about 1000 days.
The change in supermolecular structure of the fiber was evaluated by wide angle X-ray diffraction, interference microscopy and dynamic viscoelastic properties. With an increase in elapse time, the perfection of crystal increased, and the crystal orientation decreased. In the amorphous region, molecular chains were strained, and relaxed at a later time. Moreover at 900 days later, the domain, in which the molecular chains were densely packed, war in the amorphous region. these tendencies were more emphasised in the cose of leaving in to room with out themal control.
