Study of Aliphatic Polyurethanes by the Low-Field 1H NMR Relaxometry Method with the Inversion of the Integral Transformation

Kucińska-Lipka, Justyna; Sinyavsky, N.; Mershiev, I.; Kupriyanova, G. S.; Haponiuk, Józef T.

doi:10.1007/s00723-018-1067-1

Cited by 8 publications

(2 citation statements)

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“…ILT was employed to obtain the T 2 and T 1 distributions. It gave evidence of the crosslinking in the material and of the softening effect with the addition of mobile diols as PEG and the hardening effect provided by the GPCa salt [48].…”

Section: Discovery and Characterization Of New Materialsmentioning

confidence: 97%

Time Domain NMR in Polymer Science: From the Laboratory to the Industry

2019

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Highly controlled polymers and nanostructures are increasingly translated from the lab to the industry. Together with the industrialization of complex systems from renewable sources, a paradigm change in the processing of plastics and rubbers is underway, requiring a new generation of analytical tools. Here, we present the recent developments in time domain NMR (TD-NMR), starting with an introduction of the methods. Several examples illustrate the new take on traditional issues like the measurement of crosslink density in vulcanized rubber or the monitoring of crystallization kinetics, as well as the unique information that can be extracted from multiphase, nanophase and composite materials. Generally, TD-NMR is capable of determining structural parameters that are in agreement with other techniques and with the final macroscopic properties of industrial interest, as well as reveal details on the local homogeneity that are difficult to obtain otherwise. Considering its moderate technical and space requirements of performing, TD-NMR is a good candidate for assisting product and process development in several applications throughout the rubber, plastics, composites and adhesives industry.

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Section: Discovery and Characterization Of New Materialsmentioning

confidence: 97%

Time Domain NMR in Polymer Science: From the Laboratory to the Industry

2019

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“…Thus, for larger crystallites the thermodynamic equilibrium between spin system and lattice takes longer, making T 1 higher for higher crystalline samples of similar chemical structure. This effect is observed for various materials [ 26 , 27 , 28 , 29 , 30 ].…”

Section: Resultsmentioning

confidence: 85%

Features of the Gas-Permeable Crystalline Phase of Poly-2,6-dimethylphenylene Oxide

et al. 2021

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Poly-2,6-dimethylphenylene oxide (PPO) film samples with varying degrees of crystallinity (from 0 to 69%) were obtained by means of different techniques. The films were studied by various physicochemical methods (Fourier-transform infrared spectroscopy, positron annihilation lifetime spectroscopy, X-ray diffraction, and 1H nuclear magnetic resonance relaxation). Solubility coefficients of gases in the PPO samples were measured via sorption isotherms of gases by volumetric technique with chromatographic detection. The apparent activation energy of permeation and the activation energy of diffusion of all gases were estimated based on temperature dependences of gas permeability and diffusivity for amorphous and semi-crystalline PPO in the range of 20–50 °C. The peculiarities of free volume, density, and thermal properties of gas transport confirm the nanoporosity of the gas-permeable crystalline phase of PPO. So, the PPO can be included in the group of organic molecular sieves.

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