Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/27589
Title: Miscibility of poly(ethyl oxazoline)/poly(4-vinylphenol) blends as investigated by the high-resolution solid-state13C NMR
Authors: Wang, J
Cheung, MK
Mi, Y
Keywords: Poly(4-vinylphenol)
Poly(ethyl oxazoline)
Polymer blends
Issue Date: 2001
Publisher: Elsevier
Source: Polymer, 2001, v. 42, no. 5, p. 2077-2083 How to cite?
Journal: Polymer (United Kingdom) 
Abstract: The miscibility of poly(ethyl oxazoline) (PEOx) and poly(4-vinylphenol) (PVPh) blends were investigated by differential scanning calorimeter (DSC), Fourier-transform infrared spectroscopy (FTIR), and high-resolution solid-state nuclear magnetic resonance (NMR) spectroscopy. It was found that PEOx was miscible with PVPh as shown by the existence of single composition-dependent glass transition temperature (Tg) in the whole composition range. FTIR results revealed strong hydrogen bonding between the carbonyl groups of PEOx and the hydroxyl groups of PVPh. 13C cross-polarization (CP)/magic angle spinning (MAS)/dipolar decoupling (DD) spectra of the blends showed significant chemical shift changes, which support the FTIR results. The proton spin-lattice relaxation times in both the laboratory frame, T1(H), and the rotating frame, T1ρ(H), were studied as a function of blend composition, and blends gave values longer than pure polymers. The T1(H) results are in good agreement with the thermal analysis; i.e. the blends are completely homogenous on the scale of 30-40 nm. The T1ρ(H) results further indicate that the blends were homogenous on the scale of 2-3 nm.
URI: http://hdl.handle.net/10397/27589
ISSN: 0032-3861
EISSN: 1873-2291
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