Littérature scientifique sur le sujet « RMN double quanta »
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Articles de revues sur le sujet "RMN double quanta"
Rangel, Rafael E., M. Judith Percino et Edwin A. Murillo. « Resinas alquídicas altamente ramificadas obtenidas sin compuestos orgánicos volátiles. » Respuestas 23, no 1 (14 avril 2018) : 19. http://dx.doi.org/10.22463/0122820x.1325.
Texte intégralThèses sur le sujet "RMN double quanta"
Le, Hel Cindy. « Propriétés et morphologies des thermoplastiques vulcanisés (TPV) ». Electronic Thesis or Diss., Lyon, 2021. http://www.theses.fr/2021LYSE1239.
Texte intégralThermoplastics vulcanizates (TPVs) are polymer blends with interesting elasticity and processability properties. The objective of this thesis was to study PP/EPDM TPV despite the complexity of their formulations and to understand what influences the elastic recovery property. The first part of this work was focused on the influence of crosslinking chemistry and its statistics on the long-time relaxation mechanisms of crosslinked elastomeric networks. It was found that radical peroxide crosslinking provides better recovery elasticity than phenolic resin one. However, crosslinking chemistry has been seen to not be the first-order parameter that influences this property for TPV. It depends mostly on the formulation and the thermoplastic/elastomer ratio, their influence on the final morphology and compression set have been then studied in a second part. Moreover, the influence of inorganic fillers was also studied in elastomeric systems with the addition of CB or silica or in TPV systems with the addition of CB. It has been seen that the addition of CB in a system crosslinked with peroxides is beneficial for the improvement in mechanical properties: compression set or tensile test. Indeed, the crosslinking density and the compatibility between polymers were improved. Finally, a low-field NMR method has been applied to these systems, in particular with the use of the Double Quanta (DQ) sequence which gives access to the variations of molecular mobilities in the materials with the measurement of a residual dipolar coupling
Guedes, Fábio Becker. « Estudo da dinâmica e conformação de polímeros utilizando-se técnicas avançadas de RMN no estado sólido (exchange e double quantum) ». Universidade de São Paulo, 2001. http://www.teses.usp.br/teses/disponiveis/76/76132/tde-21072009-165655/.
Texte intégralThis work is based on the study of dynamics and conformation of solid-state polymers, using NMR modern techniques. For the quantitative study of slow sidegroup dynamics in a series of poly(alkyl methacrylate)s and other of poly(α-substituted acrylate)s with varying sidegroup sizes two new 13C exchange techniques were used: centerband-only detection of exchange (CODEX) and pure exchange (PUREX). Flips and small-angle motions of the ester groups associated with the p-relaxation are observed distinctly, and the fraction of slowly flipping groups has been measured with 3% precision. A decreasing in these values occurs growing the sidegroup size. In PMMA, 34% of sidegroups flip, while the fraction is c.a. 10% in PcHMA around room temperature. In PMAA, no slow sidegroup flips are detected. In PMMA, the flipping fraction is temperature-independent between 25°C and 96°C, while in PEMA, PiBMA, and PcHMA it increases continuously between room temperature and Tg (from 31 to 80% for PEMA). Backbone CH2 CODEX data confirm the results obtained for the main chain movements. Flip-independent small amplitude motions (< 5°) are also observed. Besides, it is noticed that in some poly(α -substituted acrylate)s the a sidegroup size has influence in the fraction of slowly flipping ester groups at 25°C. For the study of polymers conformation Double Quantum NMR experiments were used, for torsion angles determination between 13C-13C pairs through the polymer chain. Experiments for two standards 13C labeled samples: poly(ethy1ene oxide) - (PEO) and poly(ethy1ene teraftalate) - (PET) were performed, with and without homonuclear decoupling (13C-13C), in a Varian Inova 400 spectrometer.
Chapitres de livres sur le sujet "RMN double quanta"
Simon, Steven H. « Doubled-Semion Model ». Dans Topological Quantum, 473–84. Oxford University PressOxford, 2023. http://dx.doi.org/10.1093/oso/9780198886723.003.0032.
Texte intégralFiorini, Rodolfo A. « New CICT Framework for Deep Learning and Deep Thinking Application ». Dans Deep Learning and Neural Networks, 330–52. IGI Global, 2020. http://dx.doi.org/10.4018/978-1-7998-0414-7.ch020.
Texte intégralActes de conférences sur le sujet "RMN double quanta"
Yariv, Amnon. « Noise mechanisms in optical fiber systems and their effects on communication systems ». Dans OSA Annual Meeting. Washington, D.C. : Optica Publishing Group, 1990. http://dx.doi.org/10.1364/oam.1990.ff1.
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