2019年7月29日 · Vulcanized rubbers, i.e., vulcanized natural rubber and vulcanized chloroprene rubber, were characterized by rubber-state NMR spectroscopy. High resolution 1 H and 13 C-NMR spectra were accomplished for the vulcanized rubbers due to fast magic angle spinning.

2024年11月1日 · In this study, the vulcanization within NR/BR blends is investigated using a robust 1 H double-quantum (DQ) MAS recoupling experiment, BaBa-xy16. Two kinds of cross-linked NR/BR blends were considered with two different microstructures for the BR component.

2018年1月11日 · The chemical structures of natural rubber (NR) end groups are investigated by combining chemical treatments and sensitivity-enhanced modern nuclear magnetic resonance (NMR) spectroscopy instruments equipped with a cryoprobe.

2012年6月6日 · Molecular singularity of cross-linked natural rubber was proposed to be a significant cross-linking junction of rubber, on the basis of the assignment of nuclear magnetic resonance (NMR)...

2021年12月15日 · Natural rubber (NR) has excellent mechanical properties due to its unique molecular chain structure. In previous studies, the signal of the cis- and trans -isoprene units was deduced by 13 C-NMR spectrum of the low molecular weight fraction of NR.

2021年11月19日 · The vulcanized natural rubbers were characterized by swelling method, rubber-state NMR spectroscopy, tensile test and XRD measurement. Stereoregularity, i.e., contents of cis - and trans -1,4-isoprene units, and strain-induced …

Solid-state NMR and Fourier transform infrared are forceful methods for detecting molecular orientations, even for mobile amorphous samples, and therefore may be more suitable for disclosing the...

The quality of the hexane changes in the process as does the absolute solvation ratio. This means that chemometric approaches will have a difficult time performing these analyses. The advantage of the process NMR is that the olefin and aromatic regions of the spectrum are distinct and the intensity of these groups can be used to directly measure :

NMR 的高分辨率是通过更高温度/低旋转速率、室温/高旋转以及组合旋转和多脉冲光谱 (CRAMPS) 技术实现的。 发现高速魔角旋转 (MAS) 是实现高分辨率的最合适方法。

The wide band universal mobile NMR-analyzer Spin Track (Fig. 1) was used in all experiments with rubber made by vari-ous investigators. The main advantages of Spin Track are mobility, low cost and excellent technical characteristics.