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Quantitative Analysis of Composition of HIPP Microphase Region by AFM-IR
Infrared spectroscopy is a common method for the analysis of polymer structures, but its spatial resolution is less than a few micrometers, making it incapable of acting on micro-nano size phase regions. In recent years, French scientist Dazzi et al. combined atomic force microscopy with infrared spectroscopy based on the phenomenon of photothermal induced resonance to develop Atomic Force Infrared (AFM-IR) technology with spatial resolution of ~50 nm in various nanometer and micron structures. The study has a broad application prospects. However, due to the fact that most multi-component polymer systems have phase separation, it is difficult to obtain standard samples with uniform composition on the nanometer scale. AFM-IR technology has not been applied to quantitative analysis so far.
High-impact polypropylene (HIPP) is a widely used multi-phase multi-component polymer alloy. In its polypropylene matrix, rubber particles with core-shell structure formed by various ethylene-propylene copolymers are dispersed. It is considered that the main component of the hard core of these rubber particles is polyethylene.
State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences Su Zhaohui's team cooperates with Dr. Pobett, Ph.D., a member of ExxonMobil's Asia-Pacific R&D Center, to study the chemical composition of HIPP in different phase regions using AFM-IR technology. AFM-IR and Fourier Transform Infrared Spectroscopy (FTIR) spectra were highly consistent, and conventional FTIR was used to make the working curve with common ethylene-propylene copolymers and blending standards for quantitative analysis of AFM-IR spectra. It has been found that polypropylene is the main component of the hard core of rubber particles in some HIPP systems.
This work was recently published in Analytical Chemistry. This is the first paper published by Chinese researchers in the field of nano-infrared. It is also the first paper in the world that uses nano-infrared technology for quantitative analysis. Anasys Instruments, which develops and leads nano-infrared technology, believes that the methods established by Changchun Yinghua Research Institute make it possible to analyze the nanophase composition of complex polymer systems, and it is a new breakthrough in the field of nanometer infrared technology. Therefore, New Breakthrough Nanoscale IR Spectroscopy is adopted. The Technique for Quantification of Chemical Concentrations of Polymer Nanodomains provides news coverage of this progress and is presented as a High Impact Research article.
This work was funded by the ExxonMobil Asia-Pacific R&D Center.
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