Signals of proton NMR of pure (PVA). - ResearchGate
The intermolecular interactions of lignin with a hydrophilic polymer, poly (vinyl alcohol) (PVA), were studied using Nuclear Magnetic Resonance (NMR) and FT-IR spectroscopy of PVA/lignin...
1 H-NMR spectra of PVA and cPVA. Poly (vinyl alcohol) (PVA): 1 H-NMR ...
Recent studies indicated that Staphylococcus aureus can penetrate bone tissue through micron-sized canaliculi and evade systemic and currently available local antibiot... ... the carboxylation...
ABSTRACT: Temperature-dependent 1H NMR and dilute solution viscometry coupled with dynamic light scattering techniques were used to elucidate the aqueous phase conformation of several poly(vinyl alcohol)s (PVAs) differing in their molecular architecture (i.e., degree of blockiness, molecular weight, and degree of hydrolysis).
1H NMR and 13C NMR investigations of sequence ... - ScienceDirect
2006年10月18日 · The microstructure of poly(vinyl alcohol-co-vinyl levulinate) (VOH–VLA copolymer) was studied by 1 H NMR and 13 C NMR techniques. The sequence distributions could be obtained from the six methine triads observed in the 500-MHz 1 H NMR spectra of the copolymers: the three methylene dyads and the three carbonyl triads observed in …
Assignment of finely resolved 13C NMR spectra of poly(vinyl alcohol)
2001年11月1日 · The 13 C NMR spectra of poly(vinyl alcohol) (PVA) have been investigated by several investigators [4], [5], [6], [7], [8], [9]. Among them, Ovenall [7] qualitatively assigned enhanced methine and methylene carbon spectra of atactic and isotactic poly(vinyl alcohol)s (PVAs) with heptads and hexads, respectively.
ABSTRACT: The 1 Hand 13C nuclear magnetic resonance spectra of atactic poly( vinyl alcohol) in D20 at a temperature of 353 K were analyzed by various two-dimensional NMR (2D NMR) methods...
Solid-State 13C NMR Study of Poly(vinyl alcohol) Gels
2002年5月1日 · Poly(vinyl alcohol) (PVA) with 55% and 61% syndiotacticity, and their related dry and hydrated gels obtained by two different freeze–thawing cycles have been investigated using the solid-state 13 C CP-MAS NMR technique. From a comparative analysis of the spectra, evidence was obtained that the gelation process largely disrupts the ...
The solvation and the gelation have been examined for poly(vinyl alcohol) (PVA)/deuterated dimethyl sulfoxide (DMSO-d6)/H2O solutions by 41 NMR spectroscopy. At water contents less than
PVA物理双网络水凝胶结构-性能关系的核磁共振(NMR)研究-学位
摘要：聚乙烯醇（Polyvinylalcohol,PVA）作为具有特殊物理和化学性质的高分子，具有良好的生物相容性、化学稳定性以及生物降解性，是生物医学、组织工程等领域具有广阔应用前景的生物替代和修复材料。 这主要是因为PVA主链上含有大量的羟基，可以产生分子内和分子间氢键，并且可以和其他的功能性基团发生化学反应。 因此，深入研究PVA水凝胶结构-性能关系对于制备高性能的PVA水凝胶材料具有重要意义。 本文的研究内容如下： 1.选择了生物相容性良好的PVA和天 …
Self-Diffusion of Oligo- and Poly(ethylene glycol)s in Poly(vinyl ...
1998年5月21日 · We have measured the self-diffusion coefficients of a series of solute probes, including ethylene glycol and its oligomers and polymers in aqueous solutions and gels of poly (vinyl alcohol) (PVA) using the pulsed-gradient spin−echo NMR techniques.