Surface studies of stereoregular poly(methyl methacrylate)s: Effect of interface on near-surface composition and crystallinity

✍ Scribed by Oleg N. Tretinnikov; Kimiko Nakao; Koji Ohta; Reikichi Iwamoto

• Publisher: John Wiley and Sons
• Year: 1996
• Tongue: English
• Weight: 632 KB
• Volume: 197
• Category: Article
• ISSN: 1022-1352
• DOI: 10.1002/macp.1996.021970228

✦ Synopsis

Abstract

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.