Structure and molecular dynamics of multilayered polycarbonate/polystyrene films.

Multilayered film polycarbonate/polysty- rene (PC/PS) comprising 257 layers with total thickness 125 lm was made by coextrusion process. The nominal thickness of PC layers was 680 nm, and the nominal thick- ness of PS layers was 290 nm. Additionally, the control samples of PC and PS with the thickness of 125 lm were coextruded in the same way. There was reasonably good correlation between the PC and PS layers real thickness as measured by AFM and the estimated thickness deter- mined from the processing parameters. Significant shift of glass transition temperature is observed in multilayer film: for PS component toward higher temperature while PC still being glassy and for PC toward lower temperature while PS being in rubbery phase. To investigate the ampli- tude and geometry of fast segmental motions, the LG-CP NMR technique under fast magic-angle spinning was used. 2D 13 CA 1 H LG-CP spectra of PC, PS, and PC/PS 70/30 were recorded at various temperatures. Cross sec- tions of aromatic carbons spectra show us the influence of PC on PS and vice versa. It gives us also the information about PS and PC segmental motion as a function of tem- perature: above the glass transition temperature of PS, the PC component of a multilayer film, although still being in glassy state, becomes more flexible. V C 2012 Wiley Periodi- cals, Inc. J Appl Polym Sci 125: 4267-4274, 2012