Miscibility of Polyoxymethylene Blends as Revealed by High-resolution Solid-state 13C-NMR Spectroscopy

✍ Scribed by Akiko Matsumoto; Yuichiro Egawa; Toshihiro Matsumoto; Fumitaka Horii

• Publisher: John Wiley and Sons
• Year: 1997
• Tongue: English
• Weight: 350 KB
• Volume: 8
• Category: Article
• ISSN: 1042-7147
• DOI: 10.1002/(sici)1099-1581(199704)8:4<250::aid-pat636>3.0.co;2-9

✦ Synopsis

The miscibility of polyvinylphenol (PVPh) or terpenephenol (TPh) with polyoxymethylene (POM) was examined by high-resolution solid-state 13 C nuclear magnetic resonance (NMR) spectroscopy. It was found that the driving force for the mixing of POM and PVPh is the hydrogenbonding interaction between the phenolic OH group of PVPh and the ether oxygen of POM, and that the mixing is preferentially induced in the noncrystalline phase. 1 H relaxation time experiments indicated that POM/PVPh blends were homogeneous on a scale of 20-30 nm but heterogeneous on a scale of 2-3 nm. On the other hand, Fourier transform infrared and cross-polarization/magicangle-spinning 13 C-NMR (nuclear magnetic resonance) spectra revealed that POM and TPh are also mixed in the noncrystalline phase through the intermolecular hydrogen-bonding interaction, while some fraction of POM is still crystallizable. Moreover, the domain size of the microphase separation was estimated to be about 1 nm by the direct 1 H spin-diffusion measurements, suggesting almost homogeneous mixing on a molecular level in the noncrystalline phase.