Solid-state NMR studies on phase behavior and motional mobility in binary blends of polystyrene and poly(cyclohexyl methacrylate)

The phase behavior and motional mobility in binary blends of polystyrene (P S) and poly(cyclohexyl methacrylate) (PCHMA) have been investigated by soli d state C-13 NMR techniques. The blend miscibility has been studied by exam ining the H-1 spin-relaxation times in the laboratory frame (T-H(1)) and in the rotating frame (T-1 rho(H)) for the PCHMA/PS blends with various compo sitions and pure components. The T-1 rho(H) results show that PCHMA and PS are intimately mixed at the molecular level within the blends at all compos itions. In addition, according to the results of carbon T-1 rho. relaxation time measurements, we conclude that mixing is intimate enough to cause a r eduction in local chain mobility for PS, but an increase in side chain mobi lity for PCHMA. (C) 2001 Elsevier Science Ltd. All rights reserved.