Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/94266
Title: Miscibility of poly(methacrylic acid)/poly(4-vinylpyridine) blends and complexes investigated by high-resolution solid-state 13C NMR
Authors: Yi, J.Z.
Goh, S.H. 
Keywords: Miscibility
Poly(4-vinylpyridine)
Poly(methacrylic acid)
Issue Date: 2001
Source: Yi, J.Z.,Goh, S.H. (2001). Miscibility of poly(methacrylic acid)/poly(4-vinylpyridine) blends and complexes investigated by high-resolution solid-state 13C NMR. Polymer 42 (22) : 9313-9316. ScholarBank@NUS Repository.
Abstract: Polymer blends and complexes prepared from poly(methacrylic acid) (PMAA) and poly(4-vinylpyridine) (P4VPy) were investigated by differential scanning calorimetry (DSC) and high-resolution solid-state 13C nuclear magnetic resonance (NMR) spectroscopy. Complexes were obtained from ethanol/water (1:1) solutions, whereas blends were cast from dimethylformamide (DMF) solutions. Each of the complexes and blends showed one composition-dependent glass transition temperature (Tg), indicating that both the complexes and the blends are homogeneous on a scale of 10-30 nm. Furthermore, the Tg value of a complex is much higher than that of a blend with the same composition. Measurements of the proton spin-lattice relaxation time in the rotating frame, T1ρ(H), reveal that each of the complexes and blends has one composition-dependent T1ρ(H), indicating that both the complexes and the blends are homogeneous on a scale of 1-3 nm. However, the calculated domain sizes of the complexes and blends are almost the same. © 2001 Elsevier Science Ltd. All rights reserved.
Source Title: Polymer
URI: http://scholarbank.nus.edu.sg/handle/10635/94266
ISSN: 00323861
Appears in Collections:Staff Publications

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