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Structure and molecular dynamics of multilayered polycarbonate/polystyrene films
Author(s) -
Walczak M.,
Ciesielski W.,
Galeski A.,
Potrzebowski M. J.,
Regnier G.,
Hiltner A.,
Baer E.
Publication year - 2012
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.36567
Subject(s) - polycarbonate , polystyrene , materials science , glass transition , composite material , magic angle spinning , polymer , spectral line , analytical chemistry (journal) , polymer chemistry , chemistry , physics , chromatography , astronomy
Multilayered film polycarbonate/polystyrene (PC/PS) comprising 257 layers with total thickness 125 μm was made by coextrusion process. The nominal thickness of PC layers was 680 nm, and the nominal thickness of PS layers was 290 nm. Additionally, the control samples of PC and PS with the thickness of 125 μm 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 determined 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 amplitude and geometry of fast segmental motions, the LG‐CP NMR technique under fast magic‐angle spinning was used. 2D 13 C 1 H LG‐CP spectra of PC, PS, and PC/PS 70/30 were recorded at various temperatures. Cross sections 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 temperature: above the glass transition temperature of PS, the PC component of a multilayer film, although still being in glassy state, becomes more flexible. © 2012 Wiley Periodicals, Inc. J Appl Polym Sci, 2012