SOLID-STATE NUCLEAR-MAGNETIC-RESONANCE OF THE PA6 PC, PA6/PPO, AND PA6/PC/PPO BLENDS/

The effect of mixing time is very important to plasticization and/or o ccurrence of chemical reaction between polyamide 6/poly(propylene oxid e), polyamide 6/polycarbonate, and polyamide 6/polycarbonate/poly (pro pylene oxide) blends. The systems were investigated through solid-stat e carbon-13 cross-polarization magic angle spinning with variable cont act time in the NMR experiment. In the systems, polycarbonate can prev ent the antiplasticization effect already observed in the polyamide 6/ poly(propylene oxide) blend. Therefore, it was verified that the addit ion of polycarbonate in the polyamide 6/poly(propylene oxide) system c auses a hardening of the blend. This fact can be attributed to the res triction of the mobility of the NH group, probably influenced by the t ype of interaction that occurs in the polyamide 6/polycarbonate/poly(p ropylene oxide), due to the effect of poly(propylene oxide), which can be act as an interfacial agent promoting a better interaction between polyamide 6 and polycarbonate. (C) 1998 John Wiley & Sons, Inc.