当前位置: X-MOL 学术ACS Cent. Sci. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Three-Dimensional Visualization for Early-Stage Evolution of Polymer Aging.
ACS Central Science ( IF 12.7 ) Pub Date : 2020-05-06 , DOI: 10.1021/acscentsci.0c00133
Zekun Zhang 1 , Rui Tian 1 , Pudun Zhang 1 , Chao Lu 1 , Xue Duan 1
Affiliation  

Monitoring the evolution of polymer aging, especially early-stage aging, over both time and dimensionality can provide in-depth insight into aging-induced material invalidation and even disastrous accidents. However, it remains a great challenge because currently available methods for polymer aging only provide statistic results at a macroscopic scale. Herein, we report the first three-dimensional early-stage visualization (ESV) technique of polymer aging by using the fluorophore-bonded boronic acid to specifically target aging-induced hydroxyl groups through the B–O click reaction. This method can identify the initial aging of polypropylene (PP) as early as 20.0 min. In contrast, no signals can be detected by conventional infrared spectroscopy even after 21 days of thermal treatment. More importantly, the three-dimensional evolution for early-stage polymer aging was demonstrated: faster aggression in the horizontal plane (4.1 × 10–4 s–1) than in the vertical direction (2.6 × 10–9 m s–1) for PP films. The approach could undoubtedly provide valuable information in elucidating mechanistic details of polymer aging in three-dimensional scale and assessing the utility of advanced antiaging materials.

中文翻译:


聚合物老化早期演化的三维可视化。



监测聚合物老化的演变,特别是早期老化,在时间和维度上可以深入了解老化引起的材料失效甚至灾难性事故。然而,这仍然是一个巨大的挑战,因为目前可用的聚合物老化方法只能提供宏观尺度的统计结果。在此,我们报告了第一个聚合物老化的三维早期可视化(ESV)技术,该技术使用荧光团键合的硼酸通过 B-O 点击反应专门针对老化诱导的羟基。该方法最早可在20.0 min内识别出聚丙烯(PP)的初始老化。相比之下,即使经过 21 天的热处理,传统红外光谱也无法检测到任何信号。更重要的是,证明了早期聚合物老化的三维演化:PP在水平面(4.1 × 10 –4 s –1 )比垂直方向(2.6 × 10 –9 ms –1 )更快的侵蚀电影。该方法无疑可以为阐明三维尺度聚合物老化的机制细节和评估先进抗老化材料的效用提供有价值的信息。
更新日期:2020-05-06
down
wechat
bug