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Updated: Jan 15, 2026

The Preparation and Properties of Thermo-reversibly Cross-linked Rubber Via Diels-Alder Chemistry
07:02

The Preparation and Properties of Thermo-reversibly Cross-linked Rubber Via Diels-Alder Chemistry

Published on: August 25, 2016

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光电磁体中料比率优化的范围感知双阶段建模:从NMR结构特征到宏观性质的机械途径

Yaxian Liu1,2,3, Yadong Wu1,2,4, Zhoujun Lin4,5

  • 1College of Computer Science and Engineering, Sichuan University of Science and Engineering, Yibin 644002, China.

Materials (Basel, Switzerland)
|October 16, 2025
PubMed
概括

一种新的RATS建模方法通过通过结构中间体将单体比例与属性联系起来,优化了烯体的配方. 这种以数据为导向的方法提高了预测准确性,并减少了材料设计中的试错.

关键词:
核磁共振 (NMR) 的表征方法烯酸乙烯酸体的烯酸乙烯酸体.机械分析机械分析范围意识建模范围意识建模结构-财产路径

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Combining Microfluidics and Microrheology to Determine Rheological Properties of Soft Matter during Repeated Phase Transitions11:38

Combining Microfluidics and Microrheology to Determine Rheological Properties of Soft Matter during Repeated Phase Transitions

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¹H NMR of Conformationally Flexible Molecules: Temporal Resolution

At room temperature, the chair conformer of cyclohexane undergoes rapid ring flipping between two equivalent chair conformers at a rate of approximately 105 times per second. These two chair conformers are in equilibrium. The rapid ring flipping results in the interconversion of the axial proton to an equatorial proton and an equatorial to the axial proton. Such interconversions are too rapid and cannot be detected on the NMR timescale. Hence, the NMR spectrometer cannot distinguish between the...
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The axial and equatorial protons in cyclohexane can be distinguished by performing a variable-temperature NMR experiment. In this process, except for one proton, the remaining eleven protons are replaced by deuterium. The deuterium substitution avoids the possible peak splitting caused by the spin-spin coupling between the adjacent protons. The remaining proton flips between the axial and equatorial positions.
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