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温度控制的分子键合滞后：纳米粒子改性聚合物网络的界面动力学

Temperature-Controlled Molecular Bonding Hysteresis: Interphase Dynamics of a Nanoparticle-Modified Polymer Network.

作者信息

Klingler Andreas, Wetzel Bernd, Krüger Jan-Kristian

机构信息

Leibniz-Institut für Verbundwerkstoffe, RPTU Kaiserslautern-Landau, Erwin-Schrödinger Straße 58, 67663 Kaiserslautern, Germany.

出版信息

J Phys Chem Lett. 2024 Apr 4;15(13):3576-3580. doi: 10.1021/acs.jpclett.4c00406. Epub 2024 Mar 25.

DOI:10.1021/acs.jpclett.4c00406
PMID:38527009
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11000236/
Abstract

This study demonstrates the existence of temperature-induced molecular bonding hysteresis at nanoparticle-polymer interfaces in a highly cross-linked epoxy-based polymer, modified with core-shell rubber nanoparticles. This thermally induced bond hysteresis manifests itself in a hysteresis-like change of the strength of the electrical bond polarization between epoxy molecules and surface molecules of the core-shell nanoparticles. This kind of dynamic bond behavior can be controllably switched from one bond state to the other by a sufficient temperature change. The related optical remanence is evidenced by a refractive index hysteresis independent of the temperature change using the new experimental technique of temperature-modulated optical refractometry (TMOR). From the investigation of quasi-static and dynamic thermal expansion separately, TMOR allows for the conclusion that the observed hysteresis is caused by the specific refractivity and not the dipole number density.

摘要

本研究证明了在经核壳橡胶纳米粒子改性的高度交联环氧基聚合物中，纳米粒子 - 聚合物界面存在温度诱导的分子键合滞后现象。这种热诱导键合滞后表现为环氧分子与核壳纳米粒子表面分子之间电键极化强度的类似滞后变化。通过足够的温度变化，这种动态键合行为可以可控地从一种键合状态切换到另一种键合状态。利用温度调制光学折射法（TMOR）这一新实验技术，通过与温度变化无关的折射率滞后现象证明了相关的光学剩磁。通过分别对准静态和动态热膨胀的研究，TMOR得出结论，观察到的滞后现象是由比折射率而非偶极数密度引起的。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f99e/11000236/2122d5c83156/jz4c00406_0004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f99e/11000236/7bfc0dad132f/jz4c00406_0001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f99e/11000236/a55a45fdee6a/jz4c00406_0002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f99e/11000236/a7aadf6cc184/jz4c00406_0003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f99e/11000236/2122d5c83156/jz4c00406_0004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f99e/11000236/7bfc0dad132f/jz4c00406_0001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f99e/11000236/a55a45fdee6a/jz4c00406_0002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f99e/11000236/a7aadf6cc184/jz4c00406_0003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f99e/11000236/2122d5c83156/jz4c00406_0004.jpg

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本文引用的文献

1
Thermal glass transition beyond kinetics of a non-crystallizable glass-former.非晶形成物的热玻璃化转变超越动力学。
Soft Matter. 2018 May 9;14(18):3601-3611. doi: 10.1039/c7sm02359f.
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Molecular versus macroscopic perspective on the demixing transition of aqueous PNIPAM solutions by studying the dual character of the refractive index.通过研究折射率的双重特性，从分子和宏观角度探讨聚N-异丙基丙烯酰胺（PNIPAM）水溶液的相分离转变
Soft Matter. 2014 Oct 7;10(37):7297-305. doi: 10.1039/c4sm01222d.