通过原位中红外和近红外相关光谱实时定量聚乙烯结晶度:熔化和溶解

IF 3.9 3区 化学 Q2 POLYMER SCIENCE
Nicholas Stavinski, Ali Ghasemi, Luis J. Bruno, Carmen L. Sánchez Delgado, Marina Tsianou, Paschalis Alexandridis, Luis Velarde
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引用次数: 0

摘要

阐明半结晶聚乙烯(PE)脱晶过程中的结晶-非晶态界面对聚合物理论和塑料-塑料回收技术的发展至关重要。在本研究中,我们利用温度控制的液体流动池实验装置对熔融或溶解的PE薄膜进行了深入研究,该实验装置实时提供了中红外(MIR, 4000-700 cm−1)和近红外(NIR, 6000-4000 cm−1)光谱。光谱结果通过基本振动、组合带和泛音获得了PE脱晶和链解纠缠的分子水平信息,这些信息使用异谱二维相关光谱(2D-COS)进行了相关。开发了一种计算PE结晶度的定量程序,以跟踪熔融和溶解过程中结晶域的转变。该半经验模型在750-700 cm−1、1500-1400 cm−1、3000-2800 cm−1和4400-4200 cm−1四个光谱区域实现了至少+0.93的强线性相关。该分析揭示了这些过程中界面溶剂化环境的重要光谱趋势。最后,研究了PE纤毛解旋末端甲基(CH3)基团的时间演化与PE脱晶机理的关系。从这项研究中获得的见解促进了对开发新的解聚和溶解沉淀回收策略所必需的基本理解。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Real-Time Quantification of Polyethylene Crystallinity via In Situ Mid- and Near-Infrared Correlation Spectroscopy: Melting and Dissolution

Elucidating the crystalline-amorphous interface during decrystallization processes in semi-crystalline polyethylene (PE) is crucial for the advancement of polymer theory and plastic-to-plastic recycling technologies. In this study, we carried out an in-depth investigation of PE thin films undergoing melting or dissolution using a temperature-controlled liquid flow-cell experimental setup which provided in situ mid-infrared (MIR, 4000–700 cm−1) and near-infrared (NIR, 6000–4000 cm−1) spectra in real time. The spectroscopic results yielded molecular-level information regarding PE decrystallization and chain disentanglement via fundamental vibrations, combination bands, and overtones which were correlated using hetero-spectral two-dimensional correlation spectroscopy (2D-COS). A quantitative procedure for the calculation of PE degree of crystallinity was developed to track transformations of crystalline domains during melting and dissolution. This semi-empirical model achieved a strong linear correlation of at least +0.93 in four spectral regions: 750–700 cm−1, 1500–1400 cm−1, 3000–2800 cm−1, and 4400–4200 cm−1. This analysis revealed important spectral trends about the interfacial solvation environment during these processes. Lastly, the time evolution of the unraveling, terminal methyl (CH3) groups of PE cilia was examined in relation to the decrystallization mechanism of PE. The insights obtained from this study advance the fundamental understanding necessary for developing new depolymerization and dissolution-precipitation recycling strategies.

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来源期刊
Journal of Polymer Science
Journal of Polymer Science POLYMER SCIENCE-
CiteScore
6.30
自引率
5.90%
发文量
264
期刊介绍: Journal of Polymer Research provides a forum for the prompt publication of articles concerning the fundamental and applied research of polymers. Its great feature lies in the diversity of content which it encompasses, drawing together results from all aspects of polymer science and technology. As polymer research is rapidly growing around the globe, the aim of this journal is to establish itself as a significant information tool not only for the international polymer researchers in academia but also for those working in industry. The scope of the journal covers a wide range of the highly interdisciplinary field of polymer science and technology.
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