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热老化对用于铁路被动阻尼（垫板）的聚（酯聚氨酯）弹性体的物理化学和光学性能的影响。

Effect of Thermal Aging on the Physico-Chemical and Optical Properties of Poly(ester urethane) Elastomers Designed for Passive Damping (Pads) of the Railway.

作者信息

Rosu Liliana, Varganici Cristian-Dragos, Rosu Dan, Oprea Stefan

机构信息

Centre of Advanced Research in Bionanoconjugates and Biopolymers, "Petru Poni" Institute of Macromolecular Chemistry, 41A Gr. Ghica-Voda Alley, 700487 Iasi, Romania.

Laboratory of Polyaddition and Photochemistry, "Petru Poni" Institute of Macromolecular Chemistry, 41A Gr. Ghica-Voda Alley, 700487 Iasi, Romania.

出版信息

Polymers (Basel). 2021 Jan 7;13(2):192. doi: 10.3390/polym13020192.

DOI:10.3390/polym13020192
PMID:33430243
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7825743/
Abstract

The aim of this study consists of monitoring the effect of thermal aging on the physico-chemical and optical properties of poly(ester urethane) elastomers designed as damping materials for railways. The materials were obtained by polyaddition in two stages in melt, resulting in regular structures. The structural modifications during the thermal aging of the samples were monitored using FTIR, color changes, TGA in non-isothermal and isothermal conditions, DSC and physico-mechanical measurements. The structural regularity of the rigid and flexible segments maintained the good mechanical properties of the structures up to 200 h of thermal aging at the elevated temperatures of 40 °C, 70 °C, 100 °C and 130 °C. It was observed that at 40 °C and low exposure times, changes occur mainly to the carbonyl groups of the soft segments. At higher temperatures and longer exposure times urethane groups were affected. Extended thermal aging led to significant changes in thermo-mechanical and optical properties.

摘要

本研究的目的是监测热老化对设计用于铁路的聚（酯-聚氨酯）弹性体的物理化学和光学性能的影响。这些材料通过熔体中的两步加聚反应获得，形成规则结构。利用傅里叶变换红外光谱（FTIR）、颜色变化、非等温及等温条件下的热重分析（TGA）、差示扫描量热法（DSC）和物理力学测量来监测样品热老化过程中的结构变化。在40°C、70°C、100°C和130°C的高温下进行长达200小时的热老化，刚性和柔性链段的结构规则性使材料保持了良好的力学性能。据观察，在40°C和短暴露时间下，主要是软链段的羰基发生变化。在较高温度和较长暴露时间下，氨基甲酸酯基团受到影响。长时间的热老化导致热机械和光学性能发生显著变化。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/af4a/7825743/0cdb09be3e9c/polymers-13-00192-g011a.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/af4a/7825743/c8159c7bc440/polymers-13-00192-sch001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/af4a/7825743/16418023b847/polymers-13-00192-g001.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/af4a/7825743/2efbf922963f/polymers-13-00192-g003a.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/af4a/7825743/63c0d5a22e17/polymers-13-00192-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/af4a/7825743/467362d28b23/polymers-13-00192-g005a.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/af4a/7825743/1f772a79e499/polymers-13-00192-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/af4a/7825743/e609c83c6822/polymers-13-00192-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/af4a/7825743/99e97717a3d3/polymers-13-00192-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/af4a/7825743/e0167d6950f3/polymers-13-00192-g009.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/af4a/7825743/93f58147efce/polymers-13-00192-g010.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/af4a/7825743/0cdb09be3e9c/polymers-13-00192-g011a.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/af4a/7825743/c8159c7bc440/polymers-13-00192-sch001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/af4a/7825743/16418023b847/polymers-13-00192-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/af4a/7825743/3070e0ccc977/polymers-13-00192-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/af4a/7825743/2efbf922963f/polymers-13-00192-g003a.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/af4a/7825743/63c0d5a22e17/polymers-13-00192-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/af4a/7825743/467362d28b23/polymers-13-00192-g005a.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/af4a/7825743/1f772a79e499/polymers-13-00192-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/af4a/7825743/e609c83c6822/polymers-13-00192-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/af4a/7825743/99e97717a3d3/polymers-13-00192-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/af4a/7825743/e0167d6950f3/polymers-13-00192-g009.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/af4a/7825743/93f58147efce/polymers-13-00192-g010.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/af4a/7825743/0cdb09be3e9c/polymers-13-00192-g011a.jpg

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