Miscibility of poly(vinyl alcohol)/poly(methacrylic acid) and poly(vinyl alcohol/poly(acrylic acid) systems. II. High-resolution solid-state CP/MAS 13C NMR studies.
TLDR
In this article, the authors investigated the properties of poly(vinyl alcohol)/poly(methacrylic acid) complexes and polyvinyl alkaline/poly(acrylic) blends using high-resolution 13C solid-state NMR method.Abstract:
Miscibility of poly(vinyl alcohol)/poly(methacrylic acid) complexes and poly(vinyl alcohol)/poly(acrylic acid) blends is investigated by high-resolution 13C solid-state NMR method. Observed 13C spectra are discussed in terms of hydrogen-bonding effects on chemical shift. The results indicate that poly(vinyl alcohol) and poly(methacrylic acid) are intimately mixed on a scale of 20–30 A due to intermolecular hydrogen bonding to form equimolar-ratio complexes. For the poly(vinyl alcohol)/poly(acrylic acid)=1/1 blend, the two polymers are also miscible, the crystalline phase of PVA is destroyed completely and no detectable domain can be observed for the blend on a scale of 20–30 A. Poly(vinyl alcohol)/poly(acrylic acid)=2/1 and 1/2 blends are homogenous on a scale of 200–300 A, but heterogeneous on a smaller scale.read more
Citations
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High-resolution solid-state 13C nuclear magnetic resonance study on poly(vinyl alcohol)/poly(vinylpyrrolidone) blends
TL;DR: In this article, the authors investigated the miscibility and domain structure of poly(vinyl alcohol)/poly (vinylpyrrolidone) (PVA/PVP) blends by high-resolution solid-state 13 C nuclear magnetic resonance methods.
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Blends of polycaprolactone with polyvinylalcohol: a DSC, optical microscopy and solid state NMR study
TL;DR: In this paper, a mixture of polycaprolactone (PCL) and polyvinyl alcohol (PVAl) was obtained by evaporation of a solution of both components in hexafluoroisopropanol.
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Intermolecular cross-polarization nuclear magnetic resonance studies of the miscibility of poly(ethylene naphthalene dicarboxylate)/poly(ethylene terephthalate) blends
M. Guo,Hans Gerhard Zachmann +1 more
TL;DR: In this article, the dephasing times of the dipolar decoupling were used for cross-polarization/magic-angle spinning 13 C nuclear magnetic resonance measurements on blends of poly(ethylene terephthalate) (PET), poly(methylene naphthalene dicarboxylate) and copolyesters of PET and p -hydroxybenzoic acid (PHB).
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Intermolecular interactions in blends of poly(vinyl alcohol) with poly(acrylic acid)-1. FTIR and DSC studies
TL;DR: In this article, the melting behavior of blends of polyvinyl alcohol (PVAI) and poly(acrylic acid) (PAA) has been studied as a function of blend composition and the replacement of H-bonding interactions in pure PAA and PVAI by intermolecular interactions has been proved by analysis of the OH and C�O stretching region in the i.r. spectra.
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Phase separation and thermal degradation of poly(vinyl alcohol)/poly(methacrylic acid) and poly(vinyl alcohol)/poly(acrylic acid) systems by 13C c.p./m.a.s. n.m.r.
TL;DR: In this article, phase separation and chemical structure changes occurring during thermal degradation were studied by high-resolution solid-state 13C n.m. spectra and 1H T1ϱ for samples subjected to various heat treatments.
References
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Calibration of methanol nuclear magnetic resonance thermometer at low temperature
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Hydrogen bonding in polymer blends. 1. FTIR studies of urethane-ether blends
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Resolution in 13C NMR of organic solids using high-power proton decoupling and magic-angle sample spinning
TL;DR: In this paper, the authors investigated important 13C line-broadening mechanisms in organic solids and their dependences on experimental parameters, notably static and rf magnetic field strength, and showed that no significant gain in resolution will be enjoyed at high magnetic fields, especially when variable-temperature operation is available.
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