Hsin Ho and Nadarajah Vasanthan. Long Island University, Brooklyn, NY
Polyamide 6 (PA6) has been complexed with the Lewis acid GaCl3 for the purpose of disrupting the interchain hydrogen bonded network. FTIR and 13C-NMR observations suggested that Ga metal cations form a 1:1 complex with the carbonyl oxygens of the PA6 amide groups. PA6-GaCl3 film appears to be amorphous from our x-ray diffraction and DSC data. These PA6-GaCl3 complex films may be drawn at low drawing speeds (0.01s-1) to draw ratios (DR) of ~17, and then decomplexed, or regenerated, by soaking in water. Regeneration of PA6 from the complex drawn at all draw ratios yielded gamma crystal form of PA6 with high crystallinity, conformed by FTIR spectroscopy and DSC. Drawing prior to regeneration increases the crystallinity for DRs up to 17 without changing crystal form. Complexation with GaCl3 offers a means to draw PA6 well beyond the levels normally obtained (DR ~ 5). Highly drawn PA6-GaCl3 may be readily regenerated to yield highly crystalline PA6, which can hopefully lead to PA6 fibers with improved tensile modulii.