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Updated: Jul 6, 2025

Cooling Rate Dependent Ellipsometry Measurements to Determine the Dynamics of Thin Glassy Films
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Published on: January 26, 2016

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调节玻璃平衡的分子运动的长度尺度在过度冷却和缓慢冷却的聚乙烯中

Jintian Luo1, Xiang Wang1, Ben Tong1

  • 1School of Chemistry and Chemical Engineering, Key Laboratory of Surface & Interface Science of Polymer Materials of Zhejiang Province, Zhejiang Sci-Tech University, Hangzhou 310018, China.

The journal of physical chemistry letters
|January 4, 2024
PubMed
概括

聚乙烯玻璃通过在特征温度以上的合作细分运动达到平衡. 在此下方,局部的脊柱运动有助于恢复平衡,这表明在深层玻璃状状态下存在另一种衰老机制.

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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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Step growth polymerization involves bi or multifunctional monomers. Bifunctional monomers react to form linear step growth polymers, whereas multifunctional monomers react to form non-linear or branched polymers.
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