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Surface studies of stereoregular poly(methyl methacrylate)s: Effect of interface on near‐surface composition and crystallinity
Author(s) -
Tretinnikov Oleg N.,
Nakao Kimiko,
Ohta Koji,
Iwamoto Reikichi
Publication year - 1996
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.1996.021970228
Subject(s) - crystallinity , tacticity , materials science , amorphous solid , methyl methacrylate , attenuated total reflection , infrared spectroscopy , polymer , polymer chemistry , poly(methyl methacrylate) , microstructure , analytical chemistry (journal) , crystallography , composite material , chemistry , polymerization , organic chemistry
The surface microstructure of the cast films of syndiotactic and stereocomplex poly(methyl methacrylate)s (PMMA) was studied by the attenuated total reflection IR (IR/ATR) method. For comparison, the bulk structure was analyzed by transmission IR spectroscopy. For the syndiotactic PMMA, the relative intensity of the “crystalline” band at 860 cm −1 to the “amorphous” band at 841 cm −1 in the IR/ATR spectra indicates that the degree of crystallinity is enhanced or reduced near the surface region, depending on the degree of polymer stereoregularity and the contacting medium. For a stereocomplex PMMA film it was found that the surface regions are less crystalline than the bulk of the film. The relative intensity of the peak at 750 cm −1 to that at 758 cm −1 in the IR spectra also indicates that the stereocomplex film contains an excess of the syndiotactic component in the surfaces and that the surface enrichment is stronger at the air‐side surface.