Observing a Chemical Reaction at a Buried Solid/Solid Interface in Situ
| Autor: | Brian W. Walther, Christopher J. Tucker, Rajesh Paradkar, Xiaoyun Chen, John S. Andre, Bolin Li, Zhan Chen, Chuang Feng, Carol Mohler |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
chemistry.chemical_classification
010401 analytical chemistry Maleic anhydride Infrared spectroscopy Polymer Adhesion Activation energy 010402 general chemistry 01 natural sciences Chemical reaction 0104 chemical sciences Analytical Chemistry chemistry.chemical_compound Hydrolysis chemistry Chemical engineering Amide |
| Zdroj: | Analytical chemistry. 92(20) |
| ISSN: | 1520-6882 |
| Popis: | Chemical reactions are the most important phenomena in chemistry. However, chemical reactions at buried solid/solid interfaces are very difficult to study in situ. In this research, the chemical reaction between two solid polymer materials, a nylon film and a maleic anhydride (MAH) grafted poly(ethylene-octene) (MAHgEO) sample, was directly analyzed at the buried nylon/MAHgEO interface at the molecular level in real time and in situ, using surface and interface sensitive sum-frequency generation (SFG) vibrational spectroscopy. Disappearance of nylon signals indicated a chemical reaction between amine and hydrolyzed amide groups of nylon and MAH groups on the MAHgEO at the buried interface. The appearance of SFG signals from reaction products was also observed at the buried nylon/MAHgEO interface. The mechanism of the observed interfacial reaction was further analyzed. Temperature-dependent SFG experiments were performed to measure the activation energy of the interfacial reaction, enabling a comparison with that reported for the bulk materials. The interfacial chemical reaction between nylon and MAHgEO greatly improved the adhesion of these dissimilar materials. The detailed analysis of a chemical reaction between two polymers at the polymer/polymer buried interface underscores the utility of SFG as a powerful analytical tool to build understanding of buried interfaces and to accelerate the design of interfacial structures with desired properties. |
| Databáze: | OpenAIRE |
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